From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 7349 invoked by alias); 30 Apr 2009 07:19:22 -0000 Received: (qmail 7288 invoked by uid 22791); 30 Apr 2009 07:19:15 -0000 X-SWARE-Spam-Status: No, hits=-0.1 required=5.0 tests=AWL,BAYES_00,HK_OBFDOM,HK_OBFDOMREQ,J_CHICKENPOX_12,J_CHICKENPOX_93,SPF_PASS X-Spam-Check-By: sourceware.org Received: from smtp-out.google.com (HELO smtp-out.google.com) (216.239.33.17) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 30 Apr 2009 07:19:04 +0000 Received: from zps38.corp.google.com (zps38.corp.google.com [172.25.146.38]) by smtp-out.google.com with ESMTP id n3U7ItRG016633; Thu, 30 Apr 2009 08:18:56 +0100 Received: from localhost (ruffy.mtv.corp.google.com [172.18.118.116]) by zps38.corp.google.com with ESMTP id n3U7IrGx032674; Thu, 30 Apr 2009 00:18:54 -0700 Received: by localhost (Postfix, from userid 67641) id 99F5584890; Thu, 30 Apr 2009 00:18:53 -0700 (PDT) To: gdb-patches@sourceware.org, muller@ics.u-strasbg.fr Subject: [RFA] i386/amd64 h/w watchpoints in gdbserver Message-Id: <20090430071853.99F5584890@localhost> Date: Thu, 30 Apr 2009 07:19:00 -0000 From: dje@google.com (Doug Evans) X-System-Of-Record: true X-IsSubscribed: yes Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org X-SW-Source: 2009-04/txt/msg00804.txt.bz2 Hi. I took Pierre's patch here http://sourceware.org/ml/gdb-patches/2009-02/msg00206.html and added support for {i386,amd64}-linux. Pierre, I _think_ I didn't break win32 support, but it is different than what you originally wrote. Can you test it? This patch assumes the gdbserver memory leak fix has been applied: http://sourceware.org/ml/gdb-patches/2009-04/msg00803.html 2009-04-29 Pierre Muller Doug Evans * Makefile.in (SFILES): Add i386-low.c (i386_low_h): Define. (i386-low.o): Add dependencies. (linux-i386-low.o): Add i386-low.h dependency. (linux-x86-64-low.o): Ditto. (win32-i386-low.o): Ditto. * i386-low.c: New file. * i386-low.h: New file. * configure.srv (i[34567]86-*-cygwin*): Add i386-low.o to srv_tgtobj. (i[34567]86-*-linux*, i[34567]86-*-mingw*, x86_64-*-linux*): Ditto. * linux-i386-low.c: Include stddef.h, i386-low.h. (arch_process_info): New struct. (i386_linux_dr_get, i386_linux_dr_set): New functions. (i386_dr_low_set_addr, i386_dr_low_set_control): New functions. (i386_dr_low_get_status): New function. (i386_insert_watchpoint, i386_remove_watchpoint): New functions. (i386_stopped_by_watchpoint, i386_stopped_data_address): New functions. (i386_linux_new_process, i386_linux_new_thread): New functions. (the_low_target): Add entries for insert_watchpoint, remove_watchpoint, stopped_by_watchpoint, stopped_data_address, new_process, new_thread. * linux-low.c (linux_add_process): Initialize arch_private. (linux_remove_process): Free arch_private. (notify_low_target_new_thread): New function. (handle_extended_wait): Call it. (linux_attach_lwp_1, linux_wait_1): Ditto. (linux_insert_watchpoint): Update call to the_low_target.insert_watchpoint. (linux_remove_watchpoint): Update call to the_low_target.remove_watchpoint. (linux_stopped_by_watchpoint): Update call to the_low_target.stopped_by_watchpoint. (linux_stopped_data_address): Update call to the_low_target.stopped_data_address. * linux-low.h (process_info_private): New member arch_private. (linux_target_ops): Add arch_private parameter to insert_watchpoint, remove_watchpoint, stopped_by_watchpoint, stopped_data_address. New members new_process, new_thread. (ptid_of, PIDGET, TIDGET): New macros. * linux-x86-64-low.c: Include stddef.h, i386-low.h. (arch_process_info): New struct. (x86_64_linux_dr_get, x86_64_linux_dr_set): New functions. (i386_dr_low_set_addr, i386_dr_low_set_control): New functions. (i386_dr_low_get_status): New function. (x86_64_insert_watchpoint, x86_64_remove_watchpoint): New functions. (x86_64_stopped_by_watchpoint): New function. (x86_64_stopped_data_address): New function. (x86_64_linux_new_process, x86_64_linux_new_thread): New functions. (the_low_target): Add entries for insert_watchpoint, remove_watchpoint, stopped_by_watchpoint, stopped_data_address, new_process, new_thread. * server.h (paddr): Declare. * utils.c (NUMCELLS, CELLSIZE): New macros. (get_sell, xsnprintf, paddr): New functions. * win32-arm-low.c (the_low_target): Add entries for insert_watchpoint, remove_watchpoint, stopped_by_watchpoint, stopped_data_address. * win32-i386-low.c: Include i386-low.h. (i386_dr_low_set_addr, i386_dr_low_set_control): New functions. (i386_dr_low_get_status): New function. (the_low_target): Add entries for insert_watchpoint, remove_watchpoint, stopped_by_watchpoint, stopped_data_address. * win32-low.c (win32_insert_watchpoint): New function. (win32_remove_watchpoint): New function. (win32_stopped_by_watchpoint): New function. (win32_stopped_data_address): New function. (win32_target_ops): Add entries for insert_watchpoint, remove_watchpoint, stopped_by_watchpoint, stopped_data_address. * win32-low.h (win32_target_ops): New members insert_watchpoint, remove_watchpoint, stopped_by_watchpoint, stopped_data_address. Index: Makefile.in =================================================================== RCS file: /cvs/src/src/gdb/gdbserver/Makefile.in,v retrieving revision 1.73 diff -u -p -r1.73 Makefile.in --- Makefile.in 1 Apr 2009 22:48:05 -0000 1.73 +++ Makefile.in 30 Apr 2009 01:23:29 -0000 @@ -104,7 +104,7 @@ SFILES= $(srcdir)/gdbreplay.c $(srcdir)/ $(srcdir)/thread-db.c $(srcdir)/utils.c \ $(srcdir)/linux-arm-low.c $(srcdir)/linux-cris-low.c \ $(srcdir)/linux-crisv32-low.c $(srcdir)/linux-i386-low.c \ - $(srcdir)/i387-fp.c \ + ${srcdir}/i386-low.c $(srcdir)/i387-fp.c \ $(srcdir)/linux-ia64-low.c $(srcdir)/linux-low.c \ $(srcdir)/linux-m32r-low.c \ $(srcdir)/linux-m68k-low.c $(srcdir)/linux-mips-low.c \ @@ -287,6 +287,10 @@ signals.o: ../common/signals.c $(server_ memmem.o: ../gnulib/memmem.c $(CC) -o memmem.o -c $(CPPFLAGS) $(INTERNAL_CFLAGS) $< +i386_low_h = $(srcdir)/i386-low.h + +i386-low.o: i386-low.c $(i386_low_h) $(server_h) $(target_h) + i387-fp.o: i387-fp.c $(server_h) linux-low.o: linux-low.c $(linux_low_h) $(server_h) @@ -297,7 +301,7 @@ linux-arm-low.o: linux-arm-low.c $(linux linux-cris-low.o: linux-cris-low.c $(linux_low_h) $(server_h) linux-crisv32-low.o: linux-crisv32-low.c $(linux_low_h) $(server_h) linux-i386-low.o: linux-i386-low.c $(linux_low_h) $(server_h) \ - $(gdb_proc_service_h) + $(gdb_proc_service_h) $(i386_low_h) linux-ia64-low.o: linux-ia64-low.c $(linux_low_h) $(server_h) linux-m32r-low.o: linux-m32r-low.c $(linux_low_h) $(server_h) linux-mips-low.o: linux-mips-low.c $(linux_low_h) $(server_h) \ @@ -306,7 +310,7 @@ linux-ppc-low.o: linux-ppc-low.c $(linux linux-s390-low.o: linux-s390-low.c $(linux_low_h) $(server_h) linux-sh-low.o: linux-sh-low.c $(linux_low_h) $(server_h) linux-x86-64-low.o: linux-x86-64-low.c $(linux_low_h) $(server_h) \ - $(gdb_proc_service_h) + $(gdb_proc_service_h) $(i386_low_h) linux-xtensa-low.o: linux-xtensa-low.c xtensa-xtregs.c $(linux_low_h) $(server_h) win32_low_h = $(srcdir)/win32-low.h @@ -314,7 +318,7 @@ win32_low_h = $(srcdir)/win32-low.h win32-low.o: win32-low.c $(win32_low_h) $(server_h) $(regdef_h) $(regcache_h) win32-arm-low.o: win32-arm-low.c $(win32_low_h) $(server_h) -win32-i386-low.o: win32-i386-low.c $(win32_low_h) $(server_h) +win32-i386-low.o: win32-i386-low.c $(win32_low_h) $(server_h) $(i386_low_h) spu-low.o: spu-low.c $(server_h) Index: configure.srv =================================================================== RCS file: /cvs/src/src/gdb/gdbserver/configure.srv,v retrieving revision 1.40 diff -u -p -r1.40 configure.srv --- configure.srv 19 Apr 2009 17:54:52 -0000 1.40 +++ configure.srv 30 Apr 2009 01:23:29 -0000 @@ -53,10 +53,10 @@ case "${target}" in srv_linux_thread_db=yes ;; i[34567]86-*-cygwin*) srv_regobj=reg-i386.o - srv_tgtobj="win32-low.o win32-i386-low.o" + srv_tgtobj="i386-low.o win32-low.o win32-i386-low.o" ;; i[34567]86-*-linux*) srv_regobj=reg-i386-linux.o - srv_tgtobj="linux-low.o linux-i386-low.o i387-fp.o" + srv_tgtobj="linux-low.o linux-i386-low.o i386-low.o i387-fp.o" srv_linux_usrregs=yes srv_linux_regsets=yes srv_linux_thread_db=yes @@ -71,7 +71,7 @@ case "${target}" in srv_mingwce=yes ;; i[34567]86-*-mingw*) srv_regobj=reg-i386.o - srv_tgtobj="win32-low.o win32-i386-low.o" + srv_tgtobj="i386-low.o win32-low.o win32-i386-low.o" srv_mingw=yes ;; ia64-*-linux*) srv_regobj=reg-ia64.o @@ -170,7 +170,7 @@ case "${target}" in srv_tgtobj="spu-low.o" ;; x86_64-*-linux*) srv_regobj=reg-x86-64-linux.o - srv_tgtobj="linux-low.o linux-x86-64-low.o i387-fp.o" + srv_tgtobj="linux-low.o linux-x86-64-low.o i386-low.o i387-fp.o" srv_linux_regsets=yes srv_linux_thread_db=yes ;; Index: i386-low.c =================================================================== RCS file: i386-low.c diff -N i386-low.c --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ i386-low.c 30 Apr 2009 01:23:29 -0000 @@ -0,0 +1,667 @@ +/* Debug register code for the i386. + + Copyright (C) 2009 + Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#include "server.h" +#include "target.h" +#include "i386-low.h" + +/* Support for 8-byte wide hw watchpoints. */ +#ifndef TARGET_HAS_DR_LEN_8 +#define TARGET_HAS_DR_LEN_8 (sizeof (long) == 8) +#endif + +enum target_hw_bp_type + { + hw_write = 0, /* Common HW watchpoint */ + hw_read = 1, /* Read HW watchpoint */ + hw_access = 2, /* Access HW watchpoint */ + hw_execute = 3 /* Execute HW breakpoint */ + }; + +/* DR7 Debug Control register fields. */ + +/* How many bits to skip in DR7 to get to R/W and LEN fields. */ +#define DR_CONTROL_SHIFT 16 +/* How many bits in DR7 per R/W and LEN field for each watchpoint. */ +#define DR_CONTROL_SIZE 4 + +/* Watchpoint/breakpoint read/write fields in DR7. */ +#define DR_RW_EXECUTE (0x0) /* Break on instruction execution. */ +#define DR_RW_WRITE (0x1) /* Break on data writes. */ +#define DR_RW_READ (0x3) /* Break on data reads or writes. */ + +/* This is here for completeness. No platform supports this + functionality yet (as of March 2001). Note that the DE flag in the + CR4 register needs to be set to support this. */ +#ifndef DR_RW_IORW +#define DR_RW_IORW (0x2) /* Break on I/O reads or writes. */ +#endif + +/* Watchpoint/breakpoint length fields in DR7. The 2-bit left shift + is so we could OR this with the read/write field defined above. */ +#define DR_LEN_1 (0x0 << 2) /* 1-byte region watch or breakpoint. */ +#define DR_LEN_2 (0x1 << 2) /* 2-byte region watch. */ +#define DR_LEN_4 (0x3 << 2) /* 4-byte region watch. */ +#define DR_LEN_8 (0x2 << 2) /* 8-byte region watch (AMD64). */ + +/* Local and Global Enable flags in DR7. + + When the Local Enable flag is set, the breakpoint/watchpoint is + enabled only for the current task; the processor automatically + clears this flag on every task switch. When the Global Enable flag + is set, the breakpoint/watchpoint is enabled for all tasks; the + processor never clears this flag. + + Currently, all watchpoint are locally enabled. If you need to + enable them globally, read the comment which pertains to this in + i386_insert_aligned_watchpoint below. */ +#define DR_LOCAL_ENABLE_SHIFT 0 /* Extra shift to the local enable bit. */ +#define DR_GLOBAL_ENABLE_SHIFT 1 /* Extra shift to the global enable bit. */ +#define DR_ENABLE_SIZE 2 /* Two enable bits per debug register. */ + +/* Local and global exact breakpoint enable flags (a.k.a. slowdown + flags). These are only required on i386, to allow detection of the + exact instruction which caused a watchpoint to break; i486 and + later processors do that automatically. We set these flags for + backwards compatibility. */ +#define DR_LOCAL_SLOWDOWN (0x100) +#define DR_GLOBAL_SLOWDOWN (0x200) + +/* Fields reserved by Intel. This includes the GD (General Detect + Enable) flag, which causes a debug exception to be generated when a + MOV instruction accesses one of the debug registers. + + FIXME: My Intel manual says we should use 0xF800, not 0xFC00. */ +#define DR_CONTROL_RESERVED (0xFC00) + +/* Auxiliary helper macros. */ + +/* A value that masks all fields in DR7 that are reserved by Intel. */ +#define I386_DR_CONTROL_MASK (~DR_CONTROL_RESERVED) + +/* The I'th debug register is vacant if its Local and Global Enable + bits are reset in the Debug Control register. */ +#define I386_DR_VACANT(state, i) \ + (((state)->dr_control_mirror & (3 << (DR_ENABLE_SIZE * (i)))) == 0) + +/* Locally enable the break/watchpoint in the I'th debug register. */ +#define I386_DR_LOCAL_ENABLE(state, i) \ + do { \ + (state)->dr_control_mirror |= \ + (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (i))); \ + } while (0) + +/* Globally enable the break/watchpoint in the I'th debug register. */ +#define I386_DR_GLOBAL_ENABLE(state, i) \ + do { \ + (state)->dr_control_mirror |= \ + (1 << (DR_GLOBAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (i))); \ + } while (0) + +/* Disable the break/watchpoint in the I'th debug register. */ +#define I386_DR_DISABLE(state, i) \ + do { \ + (state)->dr_control_mirror &= \ + ~(3 << (DR_ENABLE_SIZE * (i))); \ + } while (0) + +/* Set in DR7 the RW and LEN fields for the I'th debug register. */ +#define I386_DR_SET_RW_LEN(state, i,rwlen) \ + do { \ + (state)->dr_control_mirror &= \ + ~(0x0f << (DR_CONTROL_SHIFT+DR_CONTROL_SIZE*(i))); \ + (state)->dr_control_mirror |= \ + ((rwlen) << (DR_CONTROL_SHIFT+DR_CONTROL_SIZE*(i))); \ + } while (0) + +/* Get from DR7 the RW and LEN fields for the I'th debug register. */ +#define I386_DR_GET_RW_LEN(state, i) \ + (((state)->dr_control_mirror >> (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (i))) & 0x0f) + +/* Did the watchpoint whose address is in the I'th register break? */ +#define I386_DR_WATCH_HIT(state,i) ((state)->dr_status_mirror & (1 << (i))) + +/* A macro to loop over all debug registers. */ +#define ALL_DEBUG_REGISTERS(i) for (i = 0; i < DR_NADDR; i++) + +/* Whether or not to print the mirrored debug registers. */ +static int maint_show_dr = 0; + +/* Types of operations supported by i386_handle_nonaligned_watchpoint. */ +typedef enum { WP_INSERT, WP_REMOVE, WP_COUNT } i386_wp_op_t; + +/* Internal functions. */ + +/* Return the value of a 4-bit field for DR7 suitable for watching a + region of LEN bytes for accesses of type TYPE. LEN is assumed to + have the value of 1, 2, or 4. */ +static unsigned i386_length_and_rw_bits (int len, enum target_hw_bp_type type); + +/* Insert a watchpoint at address ADDR, which is assumed to be aligned + according to the length of the region to watch. LEN_RW_BITS is the + value of the bit-field from DR7 which describes the length and + access type of the region to be watched by this watchpoint. Return + 0 on success, -1 on failure. */ +static int i386_insert_aligned_watchpoint (struct i386_debug_reg_state *state, + CORE_ADDR addr, + unsigned len_rw_bits); + +/* Remove a watchpoint at address ADDR, which is assumed to be aligned + according to the length of the region to watch. LEN_RW_BITS is the + value of the bits from DR7 which describes the length and access + type of the region watched by this watchpoint. Return 0 on + success, -1 on failure. */ +static int i386_remove_aligned_watchpoint (struct i386_debug_reg_state *state, + CORE_ADDR addr, + unsigned len_rw_bits); + +/* Insert or remove a (possibly non-aligned) watchpoint, or count the + number of debug registers required to watch a region at address + ADDR whose length is LEN for accesses of type TYPE. Return 0 on + successful insertion or removal, a positive number when queried + about the number of registers, or -1 on failure. If WHAT is not a + valid value, bombs through internal_error. */ +static int i386_handle_nonaligned_watchpoint (struct i386_debug_reg_state *state, + i386_wp_op_t what, + CORE_ADDR addr, int len, + enum target_hw_bp_type type); + +/* Implementation. */ + +/* Clear the reference counts and forget everything we knew about the + debug registers. */ + +void +i386_low_cleanup_dregs (struct i386_debug_reg_state *state) +{ + int i; + + ALL_DEBUG_REGISTERS(i) + { + state->dr_mirror[i] = 0; + state->dr_ref_count[i] = 0; + } + state->dr_control_mirror = 0; + state->dr_status_mirror = 0; +} + +/* Print the values of the mirrored debug registers. This is called + when maint_show_dr is non-zero. To set that up, type "maint + show-debug-regs" at GDB's prompt. */ + +static void +i386_show_dr (struct i386_debug_reg_state *state, + const char *func, CORE_ADDR addr, + int len, enum target_hw_bp_type type) +{ + int i; + + printf (func); + if (addr || len) + printf (" (addr=%lx, len=%d, type=%s)", + (unsigned long) addr, len, + type == hw_write ? "data-write" + : (type == hw_read ? "data-read" + : (type == hw_access ? "data-read/write" + : (type == hw_execute ? "instruction-execute" + /* FIXME: if/when I/O read/write + watchpoints are supported, add them + here. */ + : "??unknown??")))); + printf (":\n"); + printf ("\tCONTROL (DR7): %08x STATUS (DR6): %08x\n", + state->dr_control_mirror, state->dr_status_mirror); + ALL_DEBUG_REGISTERS (i) + { + printf ("\ +\tDR%d: addr=0x%s, ref.count=%d DR%d: addr=0x%s, ref.count=%d\n", + i, paddr (state->dr_mirror[i]), state->dr_ref_count[i], + i+1, paddr (state->dr_mirror[i+1]), state->dr_ref_count[i+1]); + i++; + } +} + +/* Return the value of a 4-bit field for DR7 suitable for watching a + region of LEN bytes for accesses of type TYPE. LEN is assumed to + have the value of 1, 2, or 4. */ + +static unsigned +i386_length_and_rw_bits (int len, enum target_hw_bp_type type) +{ + unsigned rw; + + switch (type) + { + case hw_execute: + rw = DR_RW_EXECUTE; + break; + case hw_write: + rw = DR_RW_WRITE; + break; + case hw_read: + /* The i386 doesn't support data-read watchpoints. */ + case hw_access: + rw = DR_RW_READ; + break; +#if 0 + /* Not yet supported. */ + case hw_io_access: + rw = DR_RW_IORW; + break; +#endif + default: + error ("\ +Invalid hardware breakpoint type %d in i386_length_and_rw_bits.\n", + (int) type); + } + + switch (len) + { + case 1: + return (DR_LEN_1 | rw); + case 2: + return (DR_LEN_2 | rw); + case 4: + return (DR_LEN_4 | rw); + case 8: + if (TARGET_HAS_DR_LEN_8) + return (DR_LEN_8 | rw); + default: + error ("\ +Invalid hardware breakpoint length %d in i386_length_and_rw_bits.\n", len); + } +} + +/* Insert a watchpoint at address ADDR, which is assumed to be aligned + according to the length of the region to watch. LEN_RW_BITS is the + value of the bits from DR7 which describes the length and access + type of the region to be watched by this watchpoint. Return 0 on + success, -1 on failure. */ + +static int +i386_insert_aligned_watchpoint (struct i386_debug_reg_state *state, + CORE_ADDR addr, unsigned len_rw_bits) +{ + int i; + + /* First, look for an occupied debug register with the same address + and the same RW and LEN definitions. If we find one, we can + reuse it for this watchpoint as well (and save a register). */ + ALL_DEBUG_REGISTERS(i) + { + if (!I386_DR_VACANT (state, i) + && state->dr_mirror[i] == addr + && I386_DR_GET_RW_LEN (state, i) == len_rw_bits) + { + state->dr_ref_count[i]++; + return 0; + } + } + + /* Next, look for a vacant debug register. */ + ALL_DEBUG_REGISTERS(i) + { + if (I386_DR_VACANT (state, i)) + break; + } + + /* No more debug registers! */ + if (i >= DR_NADDR) + return -1; + + /* Now set up the register I to watch our region. */ + + /* Record the info in our local mirrored array. */ + state->dr_mirror[i] = addr; + state->dr_ref_count[i] = 1; + I386_DR_SET_RW_LEN (state, i, len_rw_bits); + /* Note: we only enable the watchpoint locally, i.e. in the current + task. Currently, no i386 target allows or supports global + watchpoints; however, if any target would want that in the + future, GDB should probably provide a command to control whether + to enable watchpoints globally or locally, and the code below + should use global or local enable and slow-down flags as + appropriate. */ + I386_DR_LOCAL_ENABLE (state, i); + state->dr_control_mirror |= DR_LOCAL_SLOWDOWN; + state->dr_control_mirror &= I386_DR_CONTROL_MASK; + + /* Finally, actually pass the info to the inferior. */ + i386_dr_low_set_addr (i, addr); + i386_dr_low_set_control (state->dr_control_mirror); + + return 0; +} + +/* Reset a watched address for debug reg DR. + All implementations just do foo_set_addr (addr, 0), so this is a wrapper + around foo_set_addr to maintain the concept that this is a reset. */ + +static void +i386_dr_low_reset_addr (int dr) +{ + i386_dr_low_set_addr (dr, 0); +} + +/* Remove a watchpoint at address ADDR, which is assumed to be aligned + according to the length of the region to watch. LEN_RW_BITS is the + value of the bits from DR7 which describes the length and access + type of the region watched by this watchpoint. Return 0 on + success, -1 on failure. */ + +static int +i386_remove_aligned_watchpoint (struct i386_debug_reg_state *state, + CORE_ADDR addr, unsigned len_rw_bits) +{ + int i, retval = -1; + + ALL_DEBUG_REGISTERS(i) + { + if (!I386_DR_VACANT (state, i) + && state->dr_mirror[i] == addr + && I386_DR_GET_RW_LEN (state, i) == len_rw_bits) + { + if (--state->dr_ref_count[i] == 0) /* no longer in use? */ + { + /* Reset our mirror. */ + state->dr_mirror[i] = 0; + I386_DR_DISABLE (state, i); + /* Reset it in the inferior. */ + i386_dr_low_set_control (state->dr_control_mirror); + i386_dr_low_reset_addr (i); + } + retval = 0; + } + } + + return retval; +} + +/* Insert or remove a (possibly non-aligned) watchpoint, or count the + number of debug registers required to watch a region at address + ADDR whose length is LEN for accesses of type TYPE. Return 0 on + successful insertion or removal, a positive number when queried + about the number of registers, or -1 on failure. If WHAT is not a + valid value, bombs through internal_error. */ + +static int +i386_handle_nonaligned_watchpoint (struct i386_debug_reg_state *state, + i386_wp_op_t what, CORE_ADDR addr, int len, + enum target_hw_bp_type type) +{ + int retval = 0, status = 0; + int max_wp_len = TARGET_HAS_DR_LEN_8 ? 8 : 4; + + static int size_try_array[8][8] = + { + {1, 1, 1, 1, 1, 1, 1, 1}, /* Trying size one. */ + {2, 1, 2, 1, 2, 1, 2, 1}, /* Trying size two. */ + {2, 1, 2, 1, 2, 1, 2, 1}, /* Trying size three. */ + {4, 1, 2, 1, 4, 1, 2, 1}, /* Trying size four. */ + {4, 1, 2, 1, 4, 1, 2, 1}, /* Trying size five. */ + {4, 1, 2, 1, 4, 1, 2, 1}, /* Trying size six. */ + {4, 1, 2, 1, 4, 1, 2, 1}, /* Trying size seven. */ + {8, 1, 2, 1, 4, 1, 2, 1}, /* Trying size eight. */ + }; + + while (len > 0) + { + int align = addr % max_wp_len; + /* Four (eight on AMD64) is the maximum length a debug register + can watch. */ + int try = (len > max_wp_len ? (max_wp_len - 1) : len - 1); + int size = size_try_array[try][align]; + + if (what == WP_COUNT) + { + /* size_try_array[] is defined such that each iteration + through the loop is guaranteed to produce an address and a + size that can be watched with a single debug register. + Thus, for counting the registers required to watch a + region, we simply need to increment the count on each + iteration. */ + retval++; + } + else + { + unsigned len_rw = i386_length_and_rw_bits (size, type); + + if (what == WP_INSERT) + status = i386_insert_aligned_watchpoint (state, addr, len_rw); + else if (what == WP_REMOVE) + status = i386_remove_aligned_watchpoint (state, addr, len_rw); +#if 0 + else + internal_error (__FILE__, __LINE__, _("\ +Invalid value %d of operation in i386_handle_nonaligned_watchpoint.\n"), + (int)what); +#endif + /* We keep the loop going even after a failure, because some + of the other aligned watchpoints might still succeed + (e.g. if they watch addresses that are already watched, + in which case we just increment the reference counts of + occupied debug registers). If we break out of the loop + too early, we could cause those addresses watched by + other watchpoints to be disabled when breakpoint.c reacts + to our failure to insert this watchpoint and tries to + remove it. */ + if (status) + retval = status; + } + + addr += size; + len -= size; + } + + return retval; +} + +#define Z_PACKET_WRITE_WP '2' +#define Z_PACKET_READ_WP '3' +#define Z_PACKET_ACCESS_WP '4' + +static int +Z_packet_to_hw_type (char type) +{ + switch (type) + { + case Z_PACKET_WRITE_WP: return hw_write; + case Z_PACKET_READ_WP: return hw_read; + case Z_PACKET_ACCESS_WP: return hw_access; + default: + error ("Z_packet_to_hw_type: bad watchpoint type %c", type); + } +} + +/* Insert a watchpoint to watch a memory region which starts at + address ADDR and whose length is LEN bytes. Watch memory accesses + of the type TYPE_FROM_PACKET. Return 0 on success, -1 on failure. */ + +int +i386_low_insert_watchpoint (struct i386_debug_reg_state *state, + char type_from_packet, CORE_ADDR addr, int len) +{ + int retval; + int type = Z_packet_to_hw_type (type_from_packet); + + if (((len != 1 && len !=2 && len !=4) && !(TARGET_HAS_DR_LEN_8 && len == 8)) + || addr % len != 0) + { + retval = i386_handle_nonaligned_watchpoint (state, WP_INSERT, + addr, len, type); + } + else + { + unsigned len_rw = i386_length_and_rw_bits (len, type); + + retval = i386_insert_aligned_watchpoint (state, addr, len_rw); + } + + if (maint_show_dr) + i386_show_dr (state, "insert_watchpoint", addr, len, type); + + return retval; +} + +/* Remove a watchpoint that watched the memory region which starts at + address ADDR, whose length is LEN bytes, and for accesses of the + type TYPE_FROM_PACKET. Return 0 on success, -1 on failure. */ + +int +i386_low_remove_watchpoint (struct i386_debug_reg_state *state, + char type_from_packet, CORE_ADDR addr, int len) +{ + int retval; + int type = Z_packet_to_hw_type (type_from_packet); + + if (((len != 1 && len !=2 && len !=4) && !(TARGET_HAS_DR_LEN_8 && len == 8)) + || addr % len != 0) + { + retval = i386_handle_nonaligned_watchpoint (state, WP_REMOVE, + addr, len, type); + } + else + { + unsigned len_rw = i386_length_and_rw_bits (len, type); + + retval = i386_remove_aligned_watchpoint (state, addr, len_rw); + } + if (maint_show_dr) + i386_show_dr (state, "remove_watchpoint", addr, len, type); + return retval; +} + +/* Return non-zero if we can watch a memory region that starts at + address ADDR and whose length is LEN bytes. */ + +int +i386_low_region_ok_for_watchpoint (struct i386_debug_reg_state *state, + CORE_ADDR addr, int len) +{ + int nregs; + + /* Compute how many aligned watchpoints we would need to cover this + region. */ + nregs = i386_handle_nonaligned_watchpoint (state, WP_COUNT, + addr, len, hw_write); + return nregs <= DR_NADDR ? 1 : 0; +} + +/* If the inferior has some watchpoint that triggered, set the + address associated with that watchpoint and return non-zero. + Otherwise, return zero. */ + +CORE_ADDR +i386_low_stopped_data_address (struct i386_debug_reg_state *state) +{ + CORE_ADDR addr = 0; + int i; + int rc = 0; + + state->dr_status_mirror = i386_dr_low_get_status (); + + ALL_DEBUG_REGISTERS(i) + { + if (I386_DR_WATCH_HIT (state, i) + /* This second condition makes sure DRi is set up for a data + watchpoint, not a hardware breakpoint. The reason is + that GDB doesn't call the target_stopped_data_address + method except for data watchpoints. In other words, I'm + being paranoiac. */ + && I386_DR_GET_RW_LEN (state, i) != 0) + { + addr = state->dr_mirror[i]; + rc = 1; + if (maint_show_dr) + i386_show_dr (state, "watchpoint_hit", addr, -1, hw_write); + } + } + if (maint_show_dr && addr == 0) + i386_show_dr (state, "stopped_data_addr", 0, 0, hw_write); + + /* NOTE: gdb version checks rc != 0 here. */ + return addr; +} + +int +i386_low_stopped_by_watchpoint (struct i386_debug_reg_state *state) +{ + CORE_ADDR addr = 0; + /* NOTE: gdb version passes boolean found/not-found result from + i386_stopped_data_address. */ + addr = i386_low_stopped_data_address (state); + return (addr != 0); +} + +/* Support for h/w breakpoints. + This support is not currently used, kept for reference. */ + +/* Return non-zero if the inferior has some break/watchpoint that + triggered. */ + +int +i386_low_stopped_by_hwbp (struct i386_debug_reg_state *state) +{ + int i; + + state->dr_status_mirror = i386_dr_low_get_status (); + if (maint_show_dr) + i386_show_dr (state, "stopped_by_hwbp", 0, 0, hw_execute); + + ALL_DEBUG_REGISTERS(i) + { + if (I386_DR_WATCH_HIT (state, i)) + return 1; + } + + return 0; +} + +/* Insert a hardware-assisted breakpoint at ADDR. + Return 0 on success, -1 on failure. */ + +int +i386_low_insert_hw_breakpoint (struct i386_debug_reg_state *state, + CORE_ADDR addr) +{ + unsigned len_rw = i386_length_and_rw_bits (1, hw_execute); + int retval = i386_insert_aligned_watchpoint (state, addr, len_rw); + + if (maint_show_dr) + i386_show_dr (state, "insert_hwbp", addr, 1, hw_execute); + + return retval; +} + +/* Remove a hardware-assisted breakpoint at ADDR. + Return 0 on success, -1 on failure. */ + +int +i386_low_remove_hw_breakpoint (struct i386_debug_reg_state *state, + CORE_ADDR addr) +{ + unsigned len_rw = i386_length_and_rw_bits (1, hw_execute); + int retval = i386_remove_aligned_watchpoint (state, addr, len_rw); + + if (maint_show_dr) + i386_show_dr (state, "remove_hwbp", addr, 1, hw_execute); + + return retval; +} Index: i386-low.h =================================================================== RCS file: i386-low.h diff -N i386-low.h --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ i386-low.h 30 Apr 2009 01:23:29 -0000 @@ -0,0 +1,118 @@ +/* Misc. low level support for i386. + + Copyright (C) 2009 + Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +/* Support for hardware watchpoints and breakpoints using the i386 + debug registers. + + This provides several functions for inserting and removing + hardware-assisted breakpoints and watchpoints, testing if one or + more of the watchpoints triggered and at what address, checking + whether a given region can be watched, etc. + + The functions below implement debug registers sharing by reference + counts, and allow to watch regions up to 16 bytes long + (32 bytes on 64 bit hosts). */ + + +/* Debug registers' indices. */ +#define DR_FIRSTADDR 0 +#define DR_LASTADDR 3 +#define DR_NADDR 4 /* The number of debug address registers. */ +#define DR_STATUS 6 +#define DR_CONTROL 7 + +/* Global state needed to track h/w watchpoints. */ + +struct i386_debug_reg_state +{ + /* Mirror the inferior's DRi registers. We keep the status and + control registers separated because they don't hold addresses. */ + CORE_ADDR dr_mirror[DR_NADDR]; + unsigned dr_status_mirror, dr_control_mirror; + + /* Reference counts for each debug register. */ + int dr_ref_count[DR_NADDR]; +}; + +/* Clear the reference counts and forget everything we knew about DRi. */ +extern void i386_low_cleanup_dregs (struct i386_debug_reg_state *state); + +/* Insert a watchpoint to watch a memory region which starts at + address ADDR and whose length is LEN bytes. Watch memory accesses + of the type TYPE_FROM_PACKET. Return 0 on success, -1 on failure. */ +extern int i386_low_insert_watchpoint (struct i386_debug_reg_state *state, + char type_from_packet, CORE_ADDR addr, + int len); + +/* Remove a watchpoint that watched the memory region which starts at + address ADDR, whose length is LEN bytes, and for accesses of the + type TYPE_FROM_PACKET. Return 0 on success, -1 on failure. */ +extern int i386_low_remove_watchpoint (struct i386_debug_reg_state *state, + char type_from_packet, CORE_ADDR addr, + int len); + +/* Return non-zero if we can watch a memory region that starts at + address ADDR and whose length is LEN bytes. */ +extern int i386_low_region_ok_for_watchpoint (struct i386_debug_reg_state *state, + CORE_ADDR addr, int len); + +/* If the inferior has some break/watchpoint that triggered, set + the address associated with that break/watchpoint and return + true. Otherwise, return false. */ +extern CORE_ADDR i386_low_stopped_data_address (struct i386_debug_reg_state *state); + +extern int i386_low_stopped_by_watchpoint (struct i386_debug_reg_state *state); + +/* Return non-zero if the inferior has some break/watchpoint that + triggered. */ +extern int i386_low_stopped_by_hwbp (struct i386_debug_reg_state *state); + +/* Insert a hardware-assisted breakpoint at ADDR. + Return 0 on success, -1 on failure. */ +extern int i386_low_insert_hw_breakpoint (struct i386_debug_reg_state *state, + CORE_ADDR addr); + +/* Remove a hardware-assisted breakpoint at ADDR. + Return 0 on success, -1 on failure. */ +extern int i386_low_remove_hw_breakpoint (struct i386_debug_reg_state *state, + CORE_ADDR addr); + +/* Each target needs to provide several low-level functions + that will be called to insert watchpoints and hardware breakpoints + into the inferior, remove them, and check their status. These + functions are: + + i386_dr_low_set_control -- set the debug control (DR7) + register to a given value + + i386_dr_low_set_addr -- put an address into one debug register + + i386_dr_low_get_status -- return the value of the debug + status (DR6) register. +*/ + +/* Pass the address ADDR to the inferior in the I'th debug register. */ +extern void i386_dr_low_set_addr (int i, CORE_ADDR addr); + +/* Pass the value VAL to the inferior in the DR7 debug control register. */ +extern void i386_dr_low_set_control (unsigned val); + +/* Get the value of the DR6 debug status register from the inferior. */ +extern unsigned i386_dr_low_get_status (void); Index: linux-i386-low.c =================================================================== RCS file: /cvs/src/src/gdb/gdbserver/linux-i386-low.c,v retrieving revision 1.19 diff -u -p -r1.19 linux-i386-low.c --- linux-i386-low.c 22 Mar 2009 23:57:10 -0000 1.19 +++ linux-i386-low.c 30 Apr 2009 01:23:29 -0000 @@ -17,9 +17,11 @@ You should have received a copy of the GNU General Public License along with this program. If not, see . */ +#include #include "server.h" #include "linux-low.h" #include "i387-fp.h" +#include "i386-low.h" #include "gdb_proc_service.h" @@ -33,10 +35,14 @@ #define PTRACE_GET_THREAD_AREA 25 #endif +struct arch_process_info +{ + struct i386_debug_reg_state debug_reg_state; +}; + /* Defined in auto-generated file reg-i386-linux.c. */ void init_registers_i386_linux (void); - /* This module only supports access to the general purpose registers. */ #define i386_num_regs 16 @@ -187,6 +193,148 @@ i386_breakpoint_at (CORE_ADDR pc) return 0; } + +/* Support for debug registers. */ + +static unsigned long +i386_linux_dr_get (ptid_t ptid, int regnum) +{ + int tid; + unsigned long value; + + tid = TIDGET (ptid); + if (tid == 0) + tid = PIDGET (ptid); + + errno = 0; + value = ptrace (PTRACE_PEEKUSER, tid, + offsetof (struct user, u_debugreg[regnum]), 0); + if (errno != 0) + error ("Couldn't read debug register"); + + return value; +} + +static void +i386_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) +{ + int tid; + + tid = TIDGET (ptid); + if (tid == 0) + tid = PIDGET (ptid); + + errno = 0; + ptrace (PTRACE_POKEUSER, tid, + offsetof (struct user, u_debugreg[regnum]), value); + if (errno != 0) + error ("Couldn't write debug register"); +} + +/* Pass the address ADDR to the inferior in debug register REGNUM. */ + +void +i386_dr_low_set_addr (int regnum, CORE_ADDR addr) +{ + struct inferior_list_entry *lp; + + if (! (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR)) + error ("Invalid debug register"); + + for (lp = all_lwps.head; lp; lp = lp->next) + { + struct lwp_info *lwp = (struct lwp_info *) lp; + i386_linux_dr_set (ptid_of (lwp), DR_FIRSTADDR + regnum, addr); + } +} + +/* Pass the value VAL to the inferior in the DR7 debug control register. */ + +void +i386_dr_low_set_control (unsigned control) +{ + struct inferior_list_entry *lp; + + for (lp = all_lwps.head; lp; lp = lp->next) + { + struct lwp_info *lwp = (struct lwp_info *) lp; + i386_linux_dr_set (ptid_of (lwp), DR_CONTROL, control); + } +} + +/* Get the value of the DR6 debug status register from the inferior. */ + +unsigned +i386_dr_low_get_status (void) +{ + ptid_t inferior_ptid = ptid_of (get_thread_lwp (current_inferior)); + return i386_linux_dr_get (inferior_ptid, DR_STATUS); +} + +/* Watchpoint support. */ + +static int +i386_insert_watchpoint (struct arch_process_info *arch_private, + char type, CORE_ADDR addr, int len) +{ + return i386_low_insert_watchpoint (&arch_private->debug_reg_state, + type, addr, len); +} + +static int +i386_remove_watchpoint (struct arch_process_info *arch_private, + char type, CORE_ADDR addr, int len) +{ + return i386_low_remove_watchpoint (&arch_private->debug_reg_state, + type, addr, len); +} + +static int +i386_stopped_by_watchpoint (struct arch_process_info *arch_private) +{ + return i386_low_stopped_by_watchpoint (&arch_private->debug_reg_state); +} + +static CORE_ADDR +i386_stopped_data_address (struct arch_process_info *arch_private) +{ + return i386_low_stopped_data_address (&arch_private->debug_reg_state); +} + +/* Called when a new process is created. */ + +struct arch_process_info * +i386_linux_new_process (int pid, int attached) +{ + struct arch_process_info *info = xcalloc (1, sizeof (*info)); + + return info; +} + +/* Called when a new thread is detected. + INITIAL is non-zero for the main thread, zero otherwise. */ + +static void +i386_linux_new_thread (struct lwp_info *lwp, int initial) +{ + /* The initial thread has debug regs set later during process + creation/attaching handling. */ + + if (! initial) + { + int i; + ptid_t ptid = ptid_of (lwp); + int pid = PIDGET (ptid); + struct process_info *proc = find_process_pid (pid); + struct arch_process_info *arch_private = proc->private->arch_private; + struct i386_debug_reg_state *state = &arch_private->debug_reg_state; + + for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) + i386_linux_dr_set (ptid, i, state->dr_mirror[i]); + + i386_linux_dr_set (ptid, DR_CONTROL, state->dr_control_mirror); + } +} struct linux_target_ops the_low_target = { init_registers_i386_linux, @@ -201,10 +349,12 @@ struct linux_target_ops the_low_target = NULL, 1, i386_breakpoint_at, + i386_insert_watchpoint, + i386_remove_watchpoint, + i386_stopped_by_watchpoint, + i386_stopped_data_address, NULL, NULL, - NULL, - NULL, - NULL, - NULL, + i386_linux_new_process, + i386_linux_new_thread }; Index: linux-low.c =================================================================== RCS file: /cvs/src/src/gdb/gdbserver/linux-low.c,v retrieving revision 1.97 diff -u -p -r1.97 linux-low.c --- linux-low.c 3 Apr 2009 11:40:02 -0000 1.97 +++ linux-low.c 30 Apr 2009 06:26:54 -0000 @@ -120,6 +120,7 @@ static int must_set_ptrace_flags; control of gdbserver have the same architecture. */ static int new_inferior; +static void notify_low_target_new_thread (struct lwp_info *lwp, int initial); static void linux_resume_one_lwp (struct inferior_list_entry *entry, int step, int signal, siginfo_t *info); static void linux_resume (struct thread_resume *resume_info, size_t n); @@ -179,6 +180,9 @@ linux_add_process (int pid, int attached proc = add_process (pid, attached); proc->private = xcalloc (1, sizeof (*proc->private)); + if (the_low_target.new_process != NULL) + proc->private->arch_private = the_low_target.new_process (pid, attached); + return proc; } @@ -188,6 +192,7 @@ linux_add_process (int pid, int attached static void linux_remove_process (struct process_info *process) { + free (process->private->arch_private); free (process->private); remove_process (process); } @@ -231,6 +236,7 @@ handle_extended_wait (struct lwp_info *e ptid = ptid_build (pid_of (event_child), new_pid, 0); new_lwp = (struct lwp_info *) add_lwp (ptid); add_thread (ptid, new_lwp); + notify_low_target_new_thread (new_lwp, 0); /* Normally we will get the pending SIGSTOP. But in some cases we might get another signal delivered to the group first. @@ -313,6 +319,18 @@ add_lwp (ptid_t ptid) return lwp; } +/* Notify the backend that we have a new thread, be it the main thread + or a later one. + INITIAL is non-zero for the main thread, zero otherwise. + NOTE: This must be called when the thread is stopped. */ + +static void +notify_low_target_new_thread (struct lwp_info *lwp, int initial) +{ + if (the_low_target.new_thread != NULL) + the_low_target.new_thread (lwp, initial); +} + /* Start an inferior process and returns its pid. ALLARGS is a vector of program-name and args. */ @@ -354,6 +372,8 @@ linux_create_inferior (char *program, ch ptid = ptid_build (pid, pid, 0); new_lwp = add_lwp (ptid); add_thread (ptid, new_lwp); + /* We can't call notify_low_target_new_thread there, the thread isn't + stopped. Piggyback on must_set_ptrace_flags and call it then. */ must_set_ptrace_flags = 1; return pid; @@ -401,6 +421,7 @@ linux_attach_lwp_1 (unsigned long lwpid, new_lwp = (struct lwp_info *) add_lwp (ptid); add_thread (ptid, new_lwp); + notify_low_target_new_thread (new_lwp, initial); /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH brings it to a halt. @@ -1261,6 +1282,7 @@ retry: if (must_set_ptrace_flags) { ptrace (PTRACE_SETOPTIONS, lwpid_of (lwp), 0, PTRACE_O_TRACECLONE); + notify_low_target_new_thread (lwp, 1); must_set_ptrace_flags = 0; } /* If we are waiting for a particular child, and it exited, @@ -2599,7 +2623,11 @@ static int linux_insert_watchpoint (char type, CORE_ADDR addr, int len) { if (the_low_target.insert_watchpoint != NULL) - return the_low_target.insert_watchpoint (type, addr, len); + { + struct process_info *proc = current_process (); + return the_low_target.insert_watchpoint (proc->private->arch_private, + type, addr, len); + } else /* Unsupported (see target.h). */ return 1; @@ -2609,7 +2637,11 @@ static int linux_remove_watchpoint (char type, CORE_ADDR addr, int len) { if (the_low_target.remove_watchpoint != NULL) - return the_low_target.remove_watchpoint (type, addr, len); + { + struct process_info *proc = current_process (); + return the_low_target.remove_watchpoint (proc->private->arch_private, + type, addr, len); + } else /* Unsupported (see target.h). */ return 1; @@ -2619,7 +2651,10 @@ static int linux_stopped_by_watchpoint (void) { if (the_low_target.stopped_by_watchpoint != NULL) - return the_low_target.stopped_by_watchpoint (); + { + struct process_info *proc = current_process (); + return the_low_target.stopped_by_watchpoint (proc->private->arch_private); + } else return 0; } @@ -2628,7 +2663,10 @@ static CORE_ADDR linux_stopped_data_address (void) { if (the_low_target.stopped_data_address != NULL) - return the_low_target.stopped_data_address (); + { + struct process_info *proc = current_process (); + return the_low_target.stopped_data_address (proc->private->arch_private); + } else return 0; } Index: linux-low.h =================================================================== RCS file: /cvs/src/src/gdb/gdbserver/linux-low.h,v retrieving revision 1.28 diff -u -p -r1.28 linux-low.h --- linux-low.h 1 Apr 2009 22:50:24 -0000 1.28 +++ linux-low.h 30 Apr 2009 01:23:29 -0000 @@ -54,8 +54,13 @@ struct process_info_private /* Connection to the libthread_db library. */ td_thragent_t *thread_agent; + + /* Target-specific additions. */ + struct arch_process_info *arch_private; }; +struct lwp_info; + struct linux_target_ops { /* Architecture-specific setup. */ @@ -75,26 +80,37 @@ struct linux_target_ops int breakpoint_len; CORE_ADDR (*breakpoint_reinsert_addr) (void); - int decr_pc_after_break; int (*breakpoint_at) (CORE_ADDR pc); /* Watchpoint related functions. See target.h for comments. */ - int (*insert_watchpoint) (char type, CORE_ADDR addr, int len); - int (*remove_watchpoint) (char type, CORE_ADDR addr, int len); - int (*stopped_by_watchpoint) (void); - CORE_ADDR (*stopped_data_address) (void); + int (*insert_watchpoint) (struct arch_process_info *arch_private, + char type, CORE_ADDR addr, int len); + int (*remove_watchpoint) (struct arch_process_info *arch_private, + char type, CORE_ADDR addr, int len); + int (*stopped_by_watchpoint) (struct arch_process_info *arch_private); + CORE_ADDR (*stopped_data_address) (struct arch_process_info *arch_private); /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular for registers smaller than an xfer unit). */ void (*collect_ptrace_register) (int regno, char *buf); void (*supply_ptrace_register) (int regno, const char *buf); + + /* Hook to call when a new process is created or attached to. */ + struct arch_process_info * (*new_process) (int pid, int attached); + + /* Hook to call when a new thread is detected. + INITIAL is non-zero for the main thread, zero otherwise. */ + void (*new_thread) (struct lwp_info *, int initial); }; extern struct linux_target_ops the_low_target; +#define ptid_of(proc) ((proc)->head.id) #define pid_of(proc) ptid_get_pid ((proc)->head.id) #define lwpid_of(proc) ptid_get_lwp ((proc)->head.id) +#define PIDGET(ptid) ptid_get_pid (ptid) +#define TIDGET(ptid) ptid_get_lwp (ptid) #define get_lwp(inf) ((struct lwp_info *)(inf)) #define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr))) Index: linux-x86-64-low.c =================================================================== RCS file: /cvs/src/src/gdb/gdbserver/linux-x86-64-low.c,v retrieving revision 1.22 diff -u -p -r1.22 linux-x86-64-low.c --- linux-x86-64-low.c 22 Mar 2009 23:57:10 -0000 1.22 +++ linux-x86-64-low.c 30 Apr 2009 01:23:29 -0000 @@ -18,9 +18,11 @@ You should have received a copy of the GNU General Public License along with this program. If not, see . */ +#include #include "server.h" #include "linux-low.h" #include "i387-fp.h" +#include "i386-low.h" #include "gdb_proc_service.h" @@ -45,6 +47,11 @@ void init_registers_x86_64_linux (void); #define ARCH_GET_GS 0x1004 #endif +struct arch_process_info +{ + struct i386_debug_reg_state debug_reg_state; +}; + static int x86_64_regmap[] = { RAX * 8, RBX * 8, RCX * 8, RDX * 8, RSI * 8, RDI * 8, RBP * 8, RSP * 8, @@ -161,6 +168,148 @@ x86_64_breakpoint_at (CORE_ADDR pc) return 0; } + +/* Support for debug registers. */ + +static unsigned long +x86_64_linux_dr_get (ptid_t ptid, int regnum) +{ + int tid; + unsigned long value; + + tid = TIDGET (ptid); + if (tid == 0) + tid = PIDGET (ptid); + + errno = 0; + value = ptrace (PTRACE_PEEKUSER, tid, + offsetof (struct user, u_debugreg[regnum]), 0); + if (errno != 0) + error ("Couldn't read debug register"); + + return value; +} + +static void +x86_64_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) +{ + int tid; + + tid = TIDGET (ptid); + if (tid == 0) + tid = PIDGET (ptid); + + errno = 0; + ptrace (PTRACE_POKEUSER, tid, + offsetof (struct user, u_debugreg[regnum]), value); + if (errno != 0) + error ("Couldn't write debug register"); +} + +/* Pass the address ADDR to the inferior in debug register REGNUM. */ + +void +i386_dr_low_set_addr (int regnum, CORE_ADDR addr) +{ + struct inferior_list_entry *lp; + + if (! (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR)) + error ("Invalid debug register"); + + for (lp = all_lwps.head; lp; lp = lp->next) + { + struct lwp_info *lwp = (struct lwp_info *) lp; + x86_64_linux_dr_set (ptid_of (lwp), DR_FIRSTADDR + regnum, addr); + } +} + +/* Pass the value VAL to the inferior in the DR7 debug control register. */ + +void +i386_dr_low_set_control (unsigned control) +{ + struct inferior_list_entry *lp; + + for (lp = all_lwps.head; lp; lp = lp->next) + { + struct lwp_info *lwp = (struct lwp_info *) lp; + x86_64_linux_dr_set (ptid_of (lwp), DR_CONTROL, control); + } +} + +/* Get the value of the DR6 debug status register from the inferior. */ + +unsigned +i386_dr_low_get_status (void) +{ + ptid_t inferior_ptid = ptid_of (get_thread_lwp (current_inferior)); + return x86_64_linux_dr_get (inferior_ptid, DR_STATUS); +} + +/* Watchpoint support. */ + +static int +x86_64_insert_watchpoint (struct arch_process_info *arch_private, + char type, CORE_ADDR addr, int len) +{ + return i386_low_insert_watchpoint (&arch_private->debug_reg_state, + type, addr, len); +} + +static int +x86_64_remove_watchpoint (struct arch_process_info *arch_private, + char type, CORE_ADDR addr, int len) +{ + return i386_low_remove_watchpoint (&arch_private->debug_reg_state, + type, addr, len); +} + +static int +x86_64_stopped_by_watchpoint (struct arch_process_info *arch_private) +{ + return i386_low_stopped_by_watchpoint (&arch_private->debug_reg_state); +} + +static CORE_ADDR +x86_64_stopped_data_address (struct arch_process_info *arch_private) +{ + return i386_low_stopped_data_address (&arch_private->debug_reg_state); +} + +/* Called when a new process is created. */ + +struct arch_process_info * +x86_64_linux_new_process (int pid, int attached) +{ + struct arch_process_info *info = xcalloc (1, sizeof (*info)); + + return info; +} + +/* Called when a new thread is detected. + INITIAL is non-zero for the main thread, zero otherwise. */ + +static void +x86_64_linux_new_thread (struct lwp_info *lwp, int initial) +{ + /* The initial thread has debug regs set later during process + creation/attaching handling. */ + + if (! initial) + { + int i; + ptid_t ptid = ptid_of (lwp); + int pid = PIDGET (ptid); + struct process_info *proc = find_process_pid (pid); + struct arch_process_info *arch_private = proc->private->arch_private; + struct i386_debug_reg_state *state = &arch_private->debug_reg_state; + + for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) + x86_64_linux_dr_set (ptid, i, state->dr_mirror[i]); + + x86_64_linux_dr_set (ptid, DR_CONTROL, state->dr_control_mirror); + } +} struct linux_target_ops the_low_target = { init_registers_x86_64_linux, @@ -175,10 +324,12 @@ struct linux_target_ops the_low_target = NULL, 1, x86_64_breakpoint_at, + x86_64_insert_watchpoint, + x86_64_remove_watchpoint, + x86_64_stopped_by_watchpoint, + x86_64_stopped_data_address, NULL, NULL, - NULL, - NULL, - NULL, - NULL, + x86_64_linux_new_process, + x86_64_linux_new_thread }; Index: server.h =================================================================== RCS file: /cvs/src/src/gdb/gdbserver/server.h,v retrieving revision 1.56 diff -u -p -r1.56 server.h --- server.h 3 Apr 2009 20:15:51 -0000 1.56 +++ server.h 30 Apr 2009 01:23:29 -0000 @@ -405,6 +405,7 @@ void perror_with_name (const char *strin void error (const char *string,...) ATTR_NORETURN ATTR_FORMAT (printf, 1, 2); void fatal (const char *string,...) ATTR_NORETURN ATTR_FORMAT (printf, 1, 2); void warning (const char *string,...) ATTR_FORMAT (printf, 1, 2); +char *paddr (CORE_ADDR addr); /* Maximum number of bytes to read/write at once. The value here is chosen to fill up a packet (the headers account for the 32). */ Index: utils.c =================================================================== RCS file: /cvs/src/src/gdb/gdbserver/utils.c,v retrieving revision 1.18 diff -u -p -r1.18 utils.c --- utils.c 19 Jan 2009 00:16:46 -0000 1.18 +++ utils.c 30 Apr 2009 01:23:29 -0000 @@ -170,3 +170,37 @@ warning (const char *string,...) fprintf (stderr, "\n"); va_end (args); } + +/* temporary storage using circular buffer */ +#define NUMCELLS 4 +#define CELLSIZE 50 +static char * +get_cell (void) +{ + static char buf[NUMCELLS][CELLSIZE]; + static int cell = 0; + if (++cell >= NUMCELLS) + cell = 0; + return buf[cell]; +} + +static int +xsnprintf (char *str, size_t size, const char *format, ...) +{ + va_list args; + int ret; + + va_start (args, format); + ret = vsnprintf (str, size, format, args); + va_end (args); + + return ret; +} + +char * +paddr (CORE_ADDR addr) +{ + char *str = get_cell (); + xsnprintf (str, CELLSIZE, "%lx", (long) addr); + return str; +} Index: win32-arm-low.c =================================================================== RCS file: /cvs/src/src/gdb/gdbserver/win32-arm-low.c,v retrieving revision 1.8 diff -u -p -r1.8 win32-arm-low.c --- win32-arm-low.c 3 Jan 2009 05:57:57 -0000 1.8 +++ win32-arm-low.c 30 Apr 2009 01:23:29 -0000 @@ -122,4 +122,9 @@ struct win32_target_ops the_low_target = NULL, /* single_step */ (const unsigned char *) &arm_wince_breakpoint, arm_wince_breakpoint_len, + /* Watchpoint related functions. See target.h for comments. */ + NULL, /* insert_watchpoint */ + NULL, /* remove_watchpoint */ + NULL, /* stopped_by_watchpoint */ + NULL /* stopped_data_address */ }; Index: win32-i386-low.c =================================================================== RCS file: /cvs/src/src/gdb/gdbserver/win32-i386-low.c,v retrieving revision 1.14 diff -u -p -r1.14 win32-i386-low.c --- win32-i386-low.c 3 Jan 2009 05:57:57 -0000 1.14 +++ win32-i386-low.c 30 Apr 2009 01:23:29 -0000 @@ -17,6 +17,7 @@ #include "server.h" #include "win32-low.h" +#include "i386-low.h" #define FCS_REGNUM 27 #define FOP_REGNUM 31 @@ -31,6 +32,42 @@ static unsigned dr[8]; static int debug_registers_changed = 0; static int debug_registers_used = 0; +/* Pass the address ADDR to the inferior in the I'th debug register. + Here we just store the address in dr array, the registers will be + actually set up when windows_continue is called. */ + +void +i386_dr_low_set_addr (int i, CORE_ADDR addr) +{ + if (i < 0 || i > 3) + return; + dr[i] = (unsigned) addr; + debug_registers_changed = 1; + debug_registers_used = 1; +} + +/* Pass the value VAL to the inferior in the DR7 debug control register. + Here we just store the address in D_REGS, the watchpoint + will be actually set up in windows_wait. */ + +void +i386_dr_low_set_control (unsigned val) +{ + dr[7] = val; + debug_registers_changed = 1; + debug_registers_used = 1; +} + +/* Get the value of the DR6 debug status register from the inferior. + Here we just return the value stored in dr[6] + by the last call to thread_rec for current_event.dwThreadId id. */ + +unsigned +i386_dr_low_get_status (void) +{ + return dr[6]; +} + static void i386_initial_stuff (void) { @@ -205,4 +242,8 @@ struct win32_target_ops the_low_target = i386_single_step, NULL, /* breakpoint */ 0, /* breakpoint_len */ + i386_insert_watchpoint, + i386_remove_watchpoint, + i386_stopped_by_watchpoint, + i386_stopped_data_address }; Index: win32-low.c =================================================================== RCS file: /cvs/src/src/gdb/gdbserver/win32-low.c,v retrieving revision 1.35 diff -u -p -r1.35 win32-low.c --- win32-low.c 1 Apr 2009 22:50:24 -0000 1.35 +++ win32-low.c 30 Apr 2009 01:23:29 -0000 @@ -228,6 +228,48 @@ child_delete_thread (DWORD pid, DWORD ti delete_thread_info (thread); } +/* These watchpoint related wrapper functions simply pass on the function call + if the target has registered a corresponding function. */ + +static int +win32_insert_watchpoint (char type, CORE_ADDR addr, int len) +{ + if (the_low_target.insert_watchpoint != NULL) + return the_low_target.insert_watchpoint (type, addr, len); + else + /* Unsupported (see target.h). */ + return 1; +} + +static int +win32_remove_watchpoint (char type, CORE_ADDR addr, int len) +{ + if (the_low_target.remove_watchpoint != NULL) + return the_low_target.remove_watchpoint (type, addr, len); + else + /* Unsupported (see target.h). */ + return 1; +} + +static int +win32_stopped_by_watchpoint (void) +{ + if (the_low_target.stopped_by_watchpoint != NULL) + return the_low_target.stopped_by_watchpoint (); + else + return 0; +} + +static CORE_ADDR +win32_stopped_data_address (void) +{ + if (the_low_target.stopped_data_address != NULL) + return the_low_target.stopped_data_address (); + else + return 0; +} + + /* Transfer memory from/to the debugged process. */ static int child_xfer_memory (CORE_ADDR memaddr, char *our, int len, @@ -1697,10 +1739,10 @@ static struct target_ops win32_target_op NULL, win32_request_interrupt, NULL, - NULL, - NULL, - NULL, - NULL, + win32_insert_watchpoint, + win32_remove_watchpoint, + win32_stopped_by_watchpoint, + win32_stopped_data_address, NULL, NULL, NULL, Index: win32-low.h =================================================================== RCS file: /cvs/src/src/gdb/gdbserver/win32-low.h,v retrieving revision 1.9 diff -u -p -r1.9 win32-low.h --- win32-low.h 3 Jan 2009 05:57:57 -0000 1.9 +++ win32-low.h 30 Apr 2009 01:23:29 -0000 @@ -70,6 +70,13 @@ struct win32_target_ops const unsigned char *breakpoint; int breakpoint_len; + + /* Watchpoint related functions. See target.h for comments. */ + int (*insert_watchpoint) (char type, CORE_ADDR addr, int len); + int (*remove_watchpoint) (char type, CORE_ADDR addr, int len); + int (*stopped_by_watchpoint) (void); + CORE_ADDR (*stopped_data_address) (void); + }; extern struct win32_target_ops the_low_target;