From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 23175 invoked by alias); 8 Oct 2012 21:01:56 -0000 Received: (qmail 23161 invoked by uid 22791); 8 Oct 2012 21:01:54 -0000 X-SWARE-Spam-Status: No, hits=-4.3 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,KHOP_RCVD_TRUST,RCVD_IN_DNSWL_LOW,RCVD_IN_HOSTKARMA_YE,TW_AV X-Spam-Check-By: sourceware.org Received: from mail-ie0-f169.google.com (HELO mail-ie0-f169.google.com) (209.85.223.169) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Mon, 08 Oct 2012 21:01:46 +0000 Received: by mail-ie0-f169.google.com with SMTP id 10so12421666ied.0 for ; Mon, 08 Oct 2012 14:01:45 -0700 (PDT) Received: by 10.50.213.99 with SMTP id nr3mr6666414igc.16.1349730105300; Mon, 08 Oct 2012 14:01:45 -0700 (PDT) Received: from gnu-tools-1.localdomain (76-220-57-190.lightspeed.sntcca.sbcglobal.net. [76.220.57.190]) by mx.google.com with ESMTPS id in10sm8291607igc.14.2012.10.08.14.01.43 (version=TLSv1/SSLv3 cipher=OTHER); Mon, 08 Oct 2012 14:01:44 -0700 (PDT) Received: by gnu-tools-1.localdomain (Postfix, from userid 1000) id 73CF31A064A; Mon, 8 Oct 2012 14:01:42 -0700 (PDT) Date: Mon, 08 Oct 2012 21:01:00 -0000 From: "H.J. Lu" To: Mark Kettenis Cc: gdb-patches@sourceware.org Subject: Re: PING: PATCH: PR backtrace/14646: [x32] backtrace doesn't work Message-ID: <20121008210142.GA14305@gmail.com> References: <20121003154712.GH3028@adacore.com> <201210040657.q946vJlc006566@glazunov.sibelius.xs4all.nl> <201210081948.q98Jm3D7020175@glazunov.sibelius.xs4all.nl> <201210082022.q98KM82d014759@glazunov.sibelius.xs4all.nl> <201210082047.q98KlQ6V031554@glazunov.sibelius.xs4all.nl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <201210082047.q98KlQ6V031554@glazunov.sibelius.xs4all.nl> User-Agent: Mutt/1.5.21 (2010-09-15) 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: 2012-10/txt/msg00142.txt.bz2 On Mon, Oct 08, 2012 at 10:47:26PM +0200, Mark Kettenis wrote: > > Date: Mon, 8 Oct 2012 13:38:21 -0700 > > From: "H.J. Lu" > > > > On Mon, Oct 8, 2012 at 1:22 PM, Mark Kettenis wrote: > > >> Date: Mon, 8 Oct 2012 13:04:03 -0700 > > >> From: "H.J. Lu" > > >> > > >> On Mon, Oct 8, 2012 at 12:48 PM, Mark Kettenis wrote: > > >> >> Date: Thu, 4 Oct 2012 06:57:22 -0700 > > >> >> From: "H.J. Lu" > > >> >> > > >> >> On Wed, Oct 3, 2012 at 11:57 PM, Mark Kettenis wrote: > > >> >> > > > >> >> > Perhaps the user-regs.c mechanism can be used to establish eip -> pc > > >> >> > and esp -> sp mappings? > > >> >> > > >> >> It doesn't help as long as gdbarch_pc_regnum/gdbarch_sp_regnum > > >> >> are used for both frame pc/sp value and unwind pc/sp value. For x32, > > >> >> we want eip/esp for frame pc/sp value and rip/rsp for unwind pc/sp > > >> >> value. > > >> > > > >> > That probably means we need to set gdbarch_pc_regnum (and > > >> > gdbarch_sp_regnum) to -1 for x32. > > >> > > >> We can't set gdbarch_pc_regnum/gdbarch_sp_regnum to -1: > > >> > > >> > > >> GNU gdb (GDB) 7.5.50.20121008-cvs > > >> Copyright (C) 2012 Free Software Foundation, Inc. > > >> License GPLv3+: GNU GPL version 3 or later > > >> This is free software: you are free to change and redistribute it. > > >> There is NO WARRANTY, to the extent permitted by law. Type "show copying" > > >> and "show warranty" for details. > > >> This GDB was configured as "x86_64-unknown-linux-gnu". > > >> For bug reporting instructions, please see: > > >> ... > > >> Reading symbols from > > >> /export/build/gnu/glibc-x32/build-x86_64-linux/elf/sln...done. > > >> (gdb) b main > > >> Breakpoint 1 at 0x400c20: file sln.c, line 50. > > >> (gdb) r > > >> Starting program: /export/build/gnu/glibc-x32/build-x86_64-linux/elf/sln > > >> /export/gnu/import/git/gdb/gdb/regcache.c:1062: internal-error: > > >> regcache_read_pc: Unable to find PC > > >> A problem internal to GDB has been detected, > > >> further debugging may prove unreliable. > > >> Quit this debugging session? (y or n) > > > > > > Well, obviously you'll need to implement gdbarch_read_pc() for this to > > > work. And probably a few more gdbarch methods. > > > > What do we gain by setting gdbarch_pc_regnum/gdbarch_sp_regnum > > to -1? PC and SP are RIP and RSP for x32. We need them for > > stack unwind. The only unusual part is they are 64-bit although > > x32 is a 32-bit environment. How about this change? > > Did you even try that change? > > > diff --git a/gdb/features/i386/x32-core.xml b/gdb/features/i386/x32-core.xml > > index 1e41417..392ce24 100644 > > --- a/gdb/features/i386/x32-core.xml > > +++ b/gdb/features/i386/x32-core.xml > > @@ -34,7 +34,7 @@ > > > > > > > > - > > + > > > > > > > > @@ -44,7 +44,7 @@ > > > > > > > > - > > + > > > > > > Here is the patch I tried. It fixes PR backtrace/14646 and PR gdb/14647. H.J. --- 2012-10-08 H.J. Lu PR backtrace/14646 PR gdb/14647 * amd64-tdep.c (amd64_x32_init_abi): Don't set sp_regnum_from_eax nor pc_regnum_from_eax. * i386-tdep.c (i386_gdbarch_init): Don't use sp_regnum_from_eax nor pc_regnum_from_eax. * i386-tdep.h (gdbarch_tdep): Remove sp_regnum_from_eax and pc_regnum_from_eax. * features/i386/x32-core.xml: Use data_ptr on rsp and use code_ptr on rip. * features/i386/x32-avx-linux.c: Regenerated. * features/i386/x32-avx.c: Likewise. * features/i386/x32-linux.c: Likewise. * features/i386/x32.c: Likewise. diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c index 8c5b6cc..9cee464 100644 --- a/gdb/amd64-tdep.c +++ b/gdb/amd64-tdep.c @@ -2943,9 +2943,6 @@ amd64_x32_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) tdesc = tdesc_x32; tdep->tdesc = tdesc; - tdep->sp_regnum_from_eax = AMD64_RSP_REGNUM; - tdep->pc_regnum_from_eax = AMD64_RIP_REGNUM; - tdep->num_dword_regs = 17; set_tdesc_pseudo_register_type (gdbarch, amd64_x32_pseudo_register_type); diff --git a/gdb/features/i386/x32-avx-linux.c b/gdb/features/i386/x32-avx-linux.c index 1f39610..4dd1733 100644 --- a/gdb/features/i386/x32-avx-linux.c +++ b/gdb/features/i386/x32-avx-linux.c @@ -45,7 +45,7 @@ initialize_tdesc_x32_avx_linux (void) tdesc_create_reg (feature, "rsi", 4, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "rdi", 5, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "rbp", 6, 1, NULL, 64, "int64"); - tdesc_create_reg (feature, "rsp", 7, 1, NULL, 64, "int64"); + tdesc_create_reg (feature, "rsp", 7, 1, NULL, 64, "data_ptr"); tdesc_create_reg (feature, "r8", 8, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r9", 9, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r10", 10, 1, NULL, 64, "int64"); @@ -54,7 +54,7 @@ initialize_tdesc_x32_avx_linux (void) tdesc_create_reg (feature, "r13", 13, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r14", 14, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r15", 15, 1, NULL, 64, "int64"); - tdesc_create_reg (feature, "rip", 16, 1, NULL, 64, "uint64"); + tdesc_create_reg (feature, "rip", 16, 1, NULL, 64, "code_ptr"); tdesc_create_reg (feature, "eflags", 17, 1, NULL, 32, "i386_eflags"); tdesc_create_reg (feature, "cs", 18, 1, NULL, 32, "int32"); tdesc_create_reg (feature, "ss", 19, 1, NULL, 32, "int32"); diff --git a/gdb/features/i386/x32-avx.c b/gdb/features/i386/x32-avx.c index fb7a12c..5ceff74 100644 --- a/gdb/features/i386/x32-avx.c +++ b/gdb/features/i386/x32-avx.c @@ -43,7 +43,7 @@ initialize_tdesc_x32_avx (void) tdesc_create_reg (feature, "rsi", 4, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "rdi", 5, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "rbp", 6, 1, NULL, 64, "int64"); - tdesc_create_reg (feature, "rsp", 7, 1, NULL, 64, "int64"); + tdesc_create_reg (feature, "rsp", 7, 1, NULL, 64, "data_ptr"); tdesc_create_reg (feature, "r8", 8, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r9", 9, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r10", 10, 1, NULL, 64, "int64"); @@ -52,7 +52,7 @@ initialize_tdesc_x32_avx (void) tdesc_create_reg (feature, "r13", 13, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r14", 14, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r15", 15, 1, NULL, 64, "int64"); - tdesc_create_reg (feature, "rip", 16, 1, NULL, 64, "uint64"); + tdesc_create_reg (feature, "rip", 16, 1, NULL, 64, "code_ptr"); tdesc_create_reg (feature, "eflags", 17, 1, NULL, 32, "i386_eflags"); tdesc_create_reg (feature, "cs", 18, 1, NULL, 32, "int32"); tdesc_create_reg (feature, "ss", 19, 1, NULL, 32, "int32"); diff --git a/gdb/features/i386/x32-core.xml b/gdb/features/i386/x32-core.xml index 1e41417..392ce24 100644 --- a/gdb/features/i386/x32-core.xml +++ b/gdb/features/i386/x32-core.xml @@ -34,7 +34,7 @@ - + @@ -44,7 +44,7 @@ - + diff --git a/gdb/features/i386/x32-linux.c b/gdb/features/i386/x32-linux.c index 387436f..fd1d7b2 100644 --- a/gdb/features/i386/x32-linux.c +++ b/gdb/features/i386/x32-linux.c @@ -45,7 +45,7 @@ initialize_tdesc_x32_linux (void) tdesc_create_reg (feature, "rsi", 4, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "rdi", 5, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "rbp", 6, 1, NULL, 64, "int64"); - tdesc_create_reg (feature, "rsp", 7, 1, NULL, 64, "int64"); + tdesc_create_reg (feature, "rsp", 7, 1, NULL, 64, "data_ptr"); tdesc_create_reg (feature, "r8", 8, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r9", 9, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r10", 10, 1, NULL, 64, "int64"); @@ -54,7 +54,7 @@ initialize_tdesc_x32_linux (void) tdesc_create_reg (feature, "r13", 13, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r14", 14, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r15", 15, 1, NULL, 64, "int64"); - tdesc_create_reg (feature, "rip", 16, 1, NULL, 64, "uint64"); + tdesc_create_reg (feature, "rip", 16, 1, NULL, 64, "code_ptr"); tdesc_create_reg (feature, "eflags", 17, 1, NULL, 32, "i386_eflags"); tdesc_create_reg (feature, "cs", 18, 1, NULL, 32, "int32"); tdesc_create_reg (feature, "ss", 19, 1, NULL, 32, "int32"); diff --git a/gdb/features/i386/x32.c b/gdb/features/i386/x32.c index 34e5087..94b22ce 100644 --- a/gdb/features/i386/x32.c +++ b/gdb/features/i386/x32.c @@ -43,7 +43,7 @@ initialize_tdesc_x32 (void) tdesc_create_reg (feature, "rsi", 4, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "rdi", 5, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "rbp", 6, 1, NULL, 64, "int64"); - tdesc_create_reg (feature, "rsp", 7, 1, NULL, 64, "int64"); + tdesc_create_reg (feature, "rsp", 7, 1, NULL, 64, "data_ptr"); tdesc_create_reg (feature, "r8", 8, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r9", 9, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r10", 10, 1, NULL, 64, "int64"); @@ -52,7 +52,7 @@ initialize_tdesc_x32 (void) tdesc_create_reg (feature, "r13", 13, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r14", 14, 1, NULL, 64, "int64"); tdesc_create_reg (feature, "r15", 15, 1, NULL, 64, "int64"); - tdesc_create_reg (feature, "rip", 16, 1, NULL, 64, "uint64"); + tdesc_create_reg (feature, "rip", 16, 1, NULL, 64, "code_ptr"); tdesc_create_reg (feature, "eflags", 17, 1, NULL, 32, "i386_eflags"); tdesc_create_reg (feature, "cs", 18, 1, NULL, 32, "int32"); tdesc_create_reg (feature, "ss", 19, 1, NULL, 32, "int32"); diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c index 84e9794..ddb20aa 100644 --- a/gdb/i386-tdep.c +++ b/gdb/i386-tdep.c @@ -7705,9 +7705,6 @@ i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) tdep->num_mmx_regs = 8; tdep->num_ymm_regs = 0; - tdep->sp_regnum_from_eax = -1; - tdep->pc_regnum_from_eax = -1; - tdesc_data = tdesc_data_alloc (); set_gdbarch_relocate_instruction (gdbarch, i386_relocate_instruction); @@ -7752,14 +7749,6 @@ i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) /* Support dword pseudo-register if it hasn't been disabled. */ tdep->eax_regnum = ymm0_regnum; ymm0_regnum += tdep->num_dword_regs; - if (tdep->sp_regnum_from_eax != -1) - set_gdbarch_sp_regnum (gdbarch, - (tdep->eax_regnum - + tdep->sp_regnum_from_eax)); - if (tdep->pc_regnum_from_eax != -1) - set_gdbarch_pc_regnum (gdbarch, - (tdep->eax_regnum - + tdep->pc_regnum_from_eax)); } else tdep->eax_regnum = -1; diff --git a/gdb/i386-tdep.h b/gdb/i386-tdep.h index 76afdce..5f233f5 100644 --- a/gdb/i386-tdep.h +++ b/gdb/i386-tdep.h @@ -149,14 +149,6 @@ struct gdbarch_tdep of pseudo dword register support. */ int eax_regnum; - /* Register number for SP, relative to %eax. Set this to -1 to - indicate the absence of pseudo SP register support. */ - int sp_regnum_from_eax; - - /* Register number for PC, relative to %eax. Set this to -1 to - indicate the absence of pseudo PC register support. */ - int pc_regnum_from_eax; - /* Number of core registers. */ int num_core_regs;