[RFC PATCH v5 9/9] Add S390 support for linux-kernel target

Philipp Rudo
2018-03-12T15:31:45Z

Add s390 architecture support for the new linux-kernel target. In
particular implement the required virtual methods, enable priviledged
registers and add a kernel stack unwinder.

gdb/ChangeLog:

* s390-lk-tdep.h: New file.
* s390-lk-tdep.c: New file.
* Makefile.in (ALL_TARGET_OBS): Add s390-lk-tdep.o.
(HFILES_NO_SRCDIR): Add s390-lk-tdep.h.
(ALLDEPFILES): Add s390-lk-tdep.c.
* configure.tgt (s390*-*-linux*): Add s390-lk-tdep.o.
* s390-tdep.h: Define macros for address translation.
(gdbarch_tdep) <have_privileged>: New field.
(s390_unwind_pseudo_register): New export.
* s390-tdep.c (s390_unwind_pseudo_register): Remove static.
(s390_tdesc_valid): Add control registers and check for
priviledeged feature in tdesc.
(s390_gdbarch_tdep_alloc): Initialize new field have_priviledged.
---
gdb/Makefile.in | 3 +
gdb/configure.tgt | 6 +-
gdb/s390-lk-tdep.c | 1015 ++++++++++++++++++++++++++++++++++++++++++++++++++++
gdb/s390-lk-tdep.h | 39 ++
gdb/s390-tdep.c | 36 +-
gdb/s390-tdep.h | 66 ++++
6 files changed, 1160 insertions(+), 5 deletions(-)
create mode 100644 gdb/s390-lk-tdep.c
create mode 100644 gdb/s390-lk-tdep.h

diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 2029c933af..1970b7f734 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -760,6 +760,7 @@ ALL_TARGET_OBS = \
rs6000-tdep.o \
rx-tdep.o \
s390-linux-tdep.o \
+ s390-lk-tdep.o \
s390-tdep.o \
score-tdep.o \
sh-linux-tdep.o \
@@ -1342,6 +1343,7 @@ HFILES_NO_SRCDIR = \
rs6000-aix-tdep.h \
rs6000-tdep.h \
s390-linux-tdep.h \
+ s390-lk-tdep.h \
s390-tdep.h \
score-tdep.h \
selftest-arch.h \
@@ -2321,6 +2323,7 @@ ALLDEPFILES = \
rx-tdep.c \
s390-linux-nat.c \
s390-linux-tdep.c \
+ s390-lk-tdep.c \
s390-tdep.c \
score-tdep.c \
ser-go32.c \
diff --git a/gdb/configure.tgt b/gdb/configure.tgt
index 680b3b2e42..a9116b3b7b 100644
--- a/gdb/configure.tgt
+++ b/gdb/configure.tgt
@@ -519,9 +519,9 @@ powerpc*-*-*)

s390*-*-linux*)
# Target: S390 running Linux
- gdb_target_obs="s390-linux-tdep.o s390-tdep.o solib-svr4.o \
- linux-tdep.o linux-record.o symfile-mem.o \
- ${lk_tobjs}"
+ gdb_target_obs="s390-linux-tdep.o s390-tdep.o s390-lk-tdep.o \
+ solib-svr4.o linux-tdep.o linux-record.o \
+ symfile-mem.o ${lk_tobjs}"
build_gdbserver=yes
;;

diff --git a/gdb/s390-lk-tdep.c b/gdb/s390-lk-tdep.c
new file mode 100644
index 0000000000..d1582f2474
--- /dev/null
+++ b/gdb/s390-lk-tdep.c
@@ -0,0 +1,1015 @@
+/* Target-dependent code for linux-kernel target on S390.
+ Copyright (C) 2017 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 <http://www.gnu.org/licenses/>. */
+
+#include "defs.h"
+
+#include "auxv.h"
+#include "dwarf2-frame.h"
+#include "elf/common.h"
+#include "frame-base.h"
+#include "frame-unwind.h"
+#include "gdbarch.h"
+#include "gdbcore.h"
+#include "gdbthread.h"
+#include "lk-low.h"
+#include "lk-modules.h"
+#include "osabi.h"
+#include "regcache.h"
+#include "regset.h"
+#include "s390-tdep.h"
+#include "s390-lk-tdep.h"
+
+#include "features/s390x-cr-linux64.c"
+#include "features/s390x-vxcr-linux64.c"
+
+
+/* Register maps and sets. */
+
+static const struct regcache_map_entry s390_gregmap[] =
+ {
+ { 1, S390_PSWM_REGNUM },
+ { 1, S390_PSWA_REGNUM },
+ { 16, S390_R0_REGNUM },
+ { 16, S390_A0_REGNUM },
+ { 1, REGCACHE_MAP_SKIP, 8 }, /* ORIG_R2_REG, exists but unused. */
+ { 0 }
+ };
+
+static const struct regcache_map_entry s390x_gregmap_lk[] =
+ {
+ { 10, S390_R6_REGNUM }, /* r0-r5 volatile */
+ { -2, REGCACHE_MAP_SKIP, 8 },
+ { 1, S390_PSWA_REGNUM }, /* Use r14 for PSWA. */
+ { 0 }
+ };
+
+static const struct regcache_map_entry s390_fpregmap[] =
+ {
+ { 1, S390_FPC_REGNUM, 8 },
+ { 16, S390_F0_REGNUM, 8 },
+ { 0 }
+ };
+
+static const struct regcache_map_entry s390_regmap_vxrs_low[] =
+ {
+ { 16, S390_V0_LOWER_REGNUM, 8 },
+ { 0 }
+ };
+
+static const struct regcache_map_entry s390_regmap_vxrs_high[] =
+ {
+ { 16, S390_V16_REGNUM, 16 },
+ { 0 }
+ };
+
+static const struct regcache_map_entry s390x_regmap_cr [] =
+ {
+ { 16, S390_CR0_REGNUM, 8 },
+ { 0 }
+ };
+
+static const struct regcache_map_entry s390x_regmap_timer [] =
+ {
+ { 1, S390_TIMER_REGNUM, 8 },
+ { 0 }
+ };
+
+static const struct regcache_map_entry s390x_regmap_todcmp [] =
+ {
+ { 1, S390_TODCMP_REGNUM, 8 },
+ { 0 }
+ };
+
+static const struct regcache_map_entry s390x_regmap_todpreg [] =
+ {
+ { 1, S390_TODPREG_REGNUM, 8 },
+ { 0 }
+ };
+
+static const struct regcache_map_entry s390x_regmap_prefix [] =
+ {
+ { 1, S390_PREFIX_REGNUM, 4 },
+ { 0 }
+ };
+
+/* Gregset stored in dump section. Used for running tasks. */
+
+#define s390x_sizeof_gregset 0xd8
+static const struct regset s390_gregset = {
+ s390_gregmap,
+ regcache_supply_regset,
+ regcache_collect_regset
+};
+
+/* Gregset set stored in stack_frame. Used for sleeping tasks. */
+
+static const struct regset s390x_gregset_lk = {
+ s390x_gregmap_lk,
+ regcache_supply_regset,
+ regcache_collect_regset
+};
+
+#define s390_sizeof_fpregset 0x88
+static const struct regset s390_fpregset = {
+ s390_fpregmap,
+ regcache_supply_regset,
+ regcache_collect_regset
+};
+
+static const struct regset s390_vxrs_low_regset = {
+ s390_regmap_vxrs_low,
+ regcache_supply_regset,
+ regcache_collect_regset
+};
+
+static const struct regset s390_vxrs_high_regset = {
+ s390_regmap_vxrs_high,
+ regcache_supply_regset,
+ regcache_collect_regset
+};
+
+static const struct regset s390x_cr_regset = {
+ s390x_regmap_cr,
+ regcache_supply_regset,
+ regcache_collect_regset
+};
+
+static const struct regset s390x_timer_regset = {
+ s390x_regmap_timer,
+ regcache_supply_regset,
+ regcache_collect_regset
+};
+
+static const struct regset s390x_todcmp_regset = {
+ s390x_regmap_todcmp,
+ regcache_supply_regset,
+ regcache_collect_regset
+};
+
+static const struct regset s390x_todpreg_regset = {
+ s390x_regmap_todpreg,
+ regcache_supply_regset,
+ regcache_collect_regset
+};
+
+static const struct regset s390x_prefix_regset = {
+ s390x_regmap_prefix,
+ regcache_supply_regset,
+ regcache_collect_regset
+};
+
+/* S390 specific implementation for linux_kernel_ops. */
+
+class s390_linux_kernel_ops : public linux_kernel_ops
+{
+public:
+ s390_linux_kernel_ops (struct target_ops *target)
+ : linux_kernel_ops::linux_kernel_ops (target)
+ {}
+
+ /* See lk-low.h. Uses r14 as current pswa. */
+ void get_registers (CORE_ADDR task, struct target_ops *target,
+ struct regcache *regcache, int regnum) override;
+
+ /* See lk-low.h. */
+ bool is_kvaddr (CORE_ADDR addr) override
+ { return addr >= lk_address ("high_memory"); }
+
+ /* See lk-low.h. */
+ CORE_ADDR vtop (CORE_ADDR vaddr, CORE_ADDR pgd) override;
+
+ /* See lk-low.h. */
+ void adjust_module_layout (CORE_ADDR mod, lk_module *module) override;
+
+ /* See lk-low.h. */
+ CORE_ADDR percpu_offset (unsigned int cpu) override;
+
+ /* See lk-low.h. */
+ unsigned int beneath_thread_to_cpu (thread_info *ti) override;
+
+protected:
+ /* See lk-low.h. */
+ void arch_read_symbols () override;
+};
+
+/* Returns address of lowcore of given cpu. */
+
+static CORE_ADDR
+s390_lk_get_lowcore (unsigned int cpu)
+{
+ size_t ptr_len = lk_builtin_type_size (unsigned_long);
+ CORE_ADDR lowcore_ptr = lk_ops->address ("lowcore_ptr") + (ptr_len * cpu);
+ return lk_read_addr (lowcore_ptr);
+}
+
+/* Implement linux_kernel_ops->arch_read_symbols virtual method. */
+
+void
+s390_linux_kernel_ops::arch_read_symbols ()
+{
+ declare_field ("stack_frame->gprs", LK_CONFIG_ALWAYS);
+ declare_field ("stack_frame->back_chain", LK_CONFIG_ALWAYS);
+
+ declare_field ("pt_regs->psw", LK_CONFIG_ALWAYS);
+ declare_field ("pt_regs->gprs", LK_CONFIG_ALWAYS);
+
+ declare_field ("task_struct->stack", LK_CONFIG_ALWAYS);
+
+ declare_field ("thread_struct->ksp", LK_CONFIG_ALWAYS);
+
+ declare_type ("lowcore", {"lowcore", /* linux 4.5+ */
+ "_lowcore"}, /* linux -4.4 */
+ LK_CONFIG_ALWAYS);
+ declare_field ("lowcore->percpu_offset", LK_CONFIG_ALWAYS);
+ declare_field ("lowcore->cpu_nr", LK_CONFIG_ALWAYS);
+ declare_field ("lowcore->async_stack", LK_CONFIG_ALWAYS);
+ declare_field ("lowcore->panic_stack", LK_CONFIG_ALWAYS);
+ declare_field ("lowcore->restart_stack", LK_CONFIG_ALWAYS);
+
+ declare_field ("psw_t->mask", LK_CONFIG_ALWAYS);
+ declare_field ("psw_t->addr", LK_CONFIG_ALWAYS);
+
+ declare_field ("mod_arch_specific->plt_offset", LK_CONFIG_ALWAYS);
+ declare_field ("mod_arch_specific->plt_size", LK_CONFIG_ALWAYS);
+
+ declare_address ("lowcore_ptr", LK_CONFIG_ALWAYS);
+ declare_address ("high_memory", LK_CONFIG_ALWAYS);
+}
+
+/* Implement linux_kernel_ops->get_registers virtual method. */
+
+void
+s390_linux_kernel_ops::get_registers (CORE_ADDR task,
+ struct target_ops *target,
+ struct regcache *regcache,
+ int regnum)
+{
+ CORE_ADDR ksp, gprs;
+ gdb_byte buf[80]; /* 80 = 10 (#registers saved) * 8 (64 bit width) */
+ size_t size;
+
+ ksp = lk_read_addr (task + offset ("task_struct->thread->ksp"));
+ gprs = ksp + offset ("stack_frame->gprs");
+ size = FIELD_SIZE (field ("stack_frame->gprs"));
+ gdb_assert (size <= sizeof (buf));
+
+ read_memory (gprs, buf, size);
+ regcache->supply_regset (&s390x_gregset_lk, -1, buf, size);
+}
+
+/* Read table entry from TABLE at offset OFFSET. Helper for
+ s390_linux_kernel_ops::vtop. */
+
+static inline ULONGEST
+s390_lk_read_table_entry (CORE_ADDR table, ULONGEST offset)
+{
+ return lk_read_ulong (table + offset * lk_builtin_type_size (unsigned_long));
+}
+
+/* Implement linux_kernel_ops->vtop virtual method. */
+
+CORE_ADDR
+s390_linux_kernel_ops::vtop (CORE_ADDR vaddr, CORE_ADDR table)
+{
+ size_t addr_size = lk_builtin_type_size (unsigned_long);
+ unsigned int table_type;
+ ULONGEST entry, offset;
+
+ /* Read first entry in table to get its type. As the Table-Type bits are
+ the same in every table assume Region1-Table. */
+ entry = s390_lk_read_table_entry (table, 0);
+ table_type = (entry & S390_LK_RFTE_TT) >> 2;
+
+ switch (table_type)
+ {
+ case S390_LK_DAT_TT_REGION1:
+ offset = (vaddr & S390_LK_VADDR_RFX) >> 53;
+ entry = s390_lk_read_table_entry (table, offset);
+
+ /* Do sanity checks. */
+ if (!entry)
+ warning (_("Trying to translate address 0x%s with empty "\
+ "region-first-table entry."), phex (vaddr, addr_size));
+ else if ((entry & S390_LK_RFTE_TT) >> 2 != S390_LK_DAT_TT_REGION1)
+ warning (_("Trying to translate address 0x%s with corrupt "\
+ "table type in region-first-table entry."),
+ phex (vaddr, addr_size));
+ else if (entry & S390_LK_RFTE_I)
+ warning (_("Translating address 0x%s with invalid bit set at "\
+ "region-first-table entry."), phex (vaddr, addr_size));
+
+ table = entry & S390_LK_RFTE_O;
+
+ /* fall through */
+ case S390_LK_DAT_TT_REGION2:
+ offset = (vaddr & S390_LK_VADDR_RSX) >> 42;
+ entry = s390_lk_read_table_entry (table, offset);
+
+ /* Do sanity checks. */
+ if (!entry)
+ warning (_("Trying to translate address 0x%s with empty "\
+ "region-second-table entry."), phex (vaddr, addr_size));
+ else if ((entry & S390_LK_RSTE_TT) >> 2 != S390_LK_DAT_TT_REGION2)
+ warning (_("Trying to translate address 0x%s with corrupt "\
+ "table type in region-second-table entry."),
+ phex (vaddr, addr_size));
+ else if (entry & S390_LK_RSTE_I)
+ warning (_("Translating address 0x%s with invalid bit set at "\
+ "region-second-table entry."), phex (vaddr, addr_size));
+
+ table = entry & S390_LK_RSTE_O;
+
+ /* fall through */
+ case S390_LK_DAT_TT_REGION3:
+ offset = (vaddr & S390_LK_VADDR_RTX) >> 31;
+ entry = s390_lk_read_table_entry (table, offset);
+
+ /* Do sanity checks. */
+ if (!entry)
+ warning (_("Trying to translate address 0x%s with empty "\
+ "region-third-table entry."), phex (vaddr, addr_size));
+ else if ((entry & S390_LK_RTTE_TT) >> 2 != S390_LK_DAT_TT_REGION3)
+ warning (_("Trying to translate address 0x%s with corrupt "\
+ "table type in region-third-table entry."),
+ phex (vaddr, addr_size));
+ else if (entry & S390_LK_RTTE_I)
+ warning (_("Translating address 0x%s with invalid bit set at "\
+ "region-third-table entry."), phex (vaddr, addr_size));
+
+ /* Check for huge page. */
+ if (entry & S390_LK_RTTE_FC)
+ return (entry & S390_LK_RTTE_RFAA) + (vaddr & ~S390_LK_RTTE_RFAA);
+
+ table = entry & S390_LK_RTTE_O;
+
+ /* fall through */
+ case S390_LK_DAT_TT_SEGMENT:
+ offset = (vaddr & S390_LK_VADDR_SX) >> 20;
+ entry = s390_lk_read_table_entry (table, offset);
+
+ /* Do sanity checks. */
+ if (!entry)
+ warning (_("Trying to translate address 0x%s with empty "\
+ "segment-table entry."), phex (vaddr, addr_size));
+ else if ((entry & S390_LK_STE_TT) >> 2 != S390_LK_DAT_TT_SEGMENT)
+ warning (_("Trying to translate address 0x%s with corrupt "\
+ "table type in segment-table entry."),
+ phex (vaddr, addr_size));
+ else if (entry & S390_LK_STE_I)
+ warning (_("Translating address 0x%s with invalid bit set at "\
+ "segment-table entry."), phex (vaddr, addr_size));
+
+ /* Check for large page. */
+ if (entry & S390_LK_STE_FC)
+ return ((entry & S390_LK_STE_SFAA) + (vaddr & ~S390_LK_STE_SFAA));
+
+ table = entry & S390_LK_STE_O;
+ break;
+ } /* switch (table_type) */
+
+ offset = (vaddr & S390_LK_VADDR_PX) >> 12;
+ entry = s390_lk_read_table_entry (table, offset);
+
+ /* Do sanity checks. */
+ if (!entry)
+ warning (_("Trying to translate address 0x%s with empty page-table "\
+ "entry."), phex (vaddr, addr_size));
+ else if (entry & S390_LK_PTE_I)
+ warning (_("Translating address 0x%s with invalid bit set at "\
+ "page-table entry."), phex (vaddr, addr_size));
+
+ return (entry & S390_LK_PTE_PFAA) + (vaddr & ~S390_LK_PTE_PFAA);
+}
+
+/* Implement linux_kernel_ops->adjust_module_layout virtual method. */
+
+void
+s390_linux_kernel_ops::adjust_module_layout (CORE_ADDR mod,
+ lk_module *module)
+{
+ CORE_ADDR mod_arch = mod + offset ("module->arch");
+
+ module->core->text.base
+ += lk_read_ulong (mod_arch + offset ("mod_arch_specific->plt_offset"));
+ module->core->text.base
+ += lk_read_ulong (mod_arch + offset ("mod_arch_specific->plt_size"));
+}
+
+/* Implement linux_kernel_ops->percpu_offset virtual method. */
+
+CORE_ADDR
+s390_linux_kernel_ops::percpu_offset (unsigned int cpu)
+{
+ CORE_ADDR lowcore = s390_lk_get_lowcore (cpu);
+ return lk_read_addr (lowcore + offset ("lowcore->percpu_offset"));
+}
+
+/* Implement linux_kernel_ops->beneath_thread_to_cpu virtual method. */
+
+unsigned int
+s390_linux_kernel_ops::beneath_thread_to_cpu (thread_info *ti)
+{
+ CORE_ADDR lowcore;
+
+ regcache *regcache = get_thread_regcache (ti->ptid);
+ register_status reg_status = regcache->raw_read (S390_PREFIX_REGNUM,
+ (ULONGEST *) &lowcore);
+ if (reg_status != REG_VALID)
+ error (_("Could not find prefix register for thread with pid %d, lwp %li."),
+ ti->ptid.pid (), ti->ptid.lwp ());
+
+ return lk_read_uint (lowcore + offset ("lowcore->cpu_nr"));
+}
+
+/* Linux kernel stack unwinder. */
+
+/* Helper functions and definitions. */
+
+struct s390_lk_unwind_cache
+{
+ /* The frame this frame_cache belongs to and its ... */
+ struct frame_info *frame;
+
+ /* ... frame base, ... */
+ CORE_ADDR frame_base;
+ /* ... stack pointer, ... */
+ CORE_ADDR sp;
+ /* ... process counter, ... */
+ CORE_ADDR pc;
+ /* ... PSW mask, ... */
+ CORE_ADDR pswm;
+ /* ... PSW address and ... */
+ CORE_ADDR pswa;
+ /* ... saved general purpose registers. */
+ CORE_ADDR gprs[S390_NUM_GPRS];
+
+ /* Mask to store which gprs where saved. */
+ unsigned long gprs_p:S390_NUM_GPRS;
+ /* Does this frame contain a zero backchain? */
+ bool zero_backchain;
+};
+
+/* S390s kernel stack is split up on several memory locations:
+
+ - kernel stack (per task)
+ - async aka. interrupt stack (per cpu)
+ - panic stack (per cpu)
+ - restart stack (unique, global)
+
+ Each memory location is page aligned and has a size of four consecutive
+ pages (exception is the panic stack with size of one page). */
+
+enum s390_lk_stack_location
+{
+ S390_LK_STACK_INVALID = -1,
+ S390_LK_STACK_USER,
+ S390_LK_STACK_KERNEL,
+ S390_LK_STACK_ASYNC,
+ S390_LK_STACK_PANIC,
+ S390_LK_STACK_RESTART
+};
+
+/* Get value of gpr REGNUM stored in CACHE. */
+
+static inline struct value *
+s390_lk_unwind_get_gpr (struct s390_lk_unwind_cache *cache, int regnum)
+{
+ gdb_assert (regnum >= S390_R0_REGNUM && regnum <= S390_R15_REGNUM);
+
+ unsigned int gpr = regnum - S390_R0_REGNUM;
+ if (!(cache->gprs_p & (1 << gpr)))
+ return frame_unwind_got_optimized (cache->frame, regnum);
+
+ /* When we hit a zero_backchain R15 is the (computed) lowest address of
+ pt_regs. */
+ if (regnum == S390_R15_REGNUM && cache->zero_backchain)
+ return frame_unwind_got_address (cache->frame, regnum, cache->gprs[gpr]);
+
+ return frame_unwind_got_memory (cache->frame, regnum, cache->gprs[gpr]);
+}
+
+/* Store ADDR of gpr REGNUM in CACHE. */
+
+static inline void
+s390_lk_unwind_set_gpr (struct s390_lk_unwind_cache *cache, int regnum,
+ CORE_ADDR addr)
+{
+ gdb_assert (regnum >= S390_R0_REGNUM && regnum <= S390_R15_REGNUM);
+
+ unsigned int gpr = regnum - S390_R0_REGNUM;
+ cache->gprs[gpr] = addr;
+ cache->gprs_p |= (1 << gpr);
+}
+
+/* Allocate and initialize a new s390_lk_unwind_cache. */
+
+static struct s390_lk_unwind_cache *
+s390_lk_alloc_unwind_cache ()
+{
+ struct s390_lk_unwind_cache *cache;
+
+ cache = FRAME_OBSTACK_ZALLOC (struct s390_lk_unwind_cache);
+
+ cache->frame = NULL;
+ cache->frame_base = -1;
+ cache->zero_backchain = false;
+
+ cache->sp = -1;
+ cache->pc = -1;
+ cache->pswm = -1;
+ cache->pswa = -1;
+ for (CORE_ADDR *gpr = cache->gprs; gpr < cache->gprs + S390_NUM_GPRS; gpr++)
+ *gpr = -1;
+ cache->gprs_p = 0;
+
+ return cache;
+}
+
+/* Helper macro for s390_lk_get_stack_location to check for stacks which
+ locations are stored in the lowcore.
+
+ _addr address to be checked for
+ _lc address of the corresponding lowcore
+ _stack field name of stack in lowcore
+ _type type to be returned if _addr is on _stack
+ _size size of _stack
+*/
+
+#define s390_lk_check_lowcore_stack(_addr, _lc, _stack, _type, _size) \
+ do \
+ { \
+ CORE_ADDR _##_stack, _##_stack##_top, _##_stack##_bottom; \
+ _##_stack = lk_read_addr ((_lc) + lk_offset ("lowcore->"#_stack));\
+ _##_stack##_top = LK_ALIGN (_##_stack, S390_LK_PAGESIZE); \
+ _##_stack##_bottom = _##_stack##_top - (_size); \
+ if ((_addr) <= _##_stack##_top && (_addr) >= _##_stack##_bottom) \
+ return (_type); \
+ } \
+ while (0)
+
+/* Find and return the stack location of ADDR belonging to TASK. */
+
+static enum s390_lk_stack_location
+s390_lk_get_stack_location (CORE_ADDR task, CORE_ADDR addr)
+{
+ CORE_ADDR lowcore, top, bottom;
+ unsigned int cpu = lk_task_running (task);
+
+ /* Kernel stack. */
+ bottom = lk_read_addr (task + lk_offset ("task_struct->stack"));
+ top = bottom + S390_LK_STACKSIZE;
+ if (addr <= top && addr >= bottom)
+ return S390_LK_STACK_KERNEL;
+
+ /* A sleeping task only has the kernel stack. If a sleeping task reaches
+ this point ADDR isn't on the stack. */
+ if (cpu == LK_CPU_INVAL)
+ return S390_LK_STACK_INVALID;
+
+ lowcore = s390_lk_get_lowcore (cpu);
+
+ /* Async aka. interrupt stack. */
+ s390_lk_check_lowcore_stack (addr, lowcore, async_stack,
+ S390_LK_STACK_ASYNC, S390_LK_ASYNCSIZE);
+
+ /* Panic stack.
+ Note: The panic stack only has a size of one page. */
+ s390_lk_check_lowcore_stack (addr, lowcore, panic_stack,
+ S390_LK_STACK_PANIC, S390_LK_PAGESIZE);
+
+ /* Restart stack. */
+ s390_lk_check_lowcore_stack (addr, lowcore, restart_stack,
+ S390_LK_STACK_RESTART, S390_LK_ASYNCSIZE);
+
+ return S390_LK_STACK_INVALID;
+}
+
+/* Unwind a single NORMAL_FRAME, i.e. a struct stack_frame. */
+
+static struct s390_lk_unwind_cache *
+s390_lk_frame_unwind_cache (struct frame_info *this_frame,
+ void **this_cache)
+{
+ CORE_ADDR backchain, backchain_addr, prev_gpr15;
+
+ if (*this_cache)
+ return (struct s390_lk_unwind_cache *) *this_cache;
+
+ s390_lk_unwind_cache *cache = s390_lk_alloc_unwind_cache ();
+ *this_cache = cache;
+
+ cache->frame = this_frame;
+ /* For NORMAL_FRAMES, cache->sp == lowest address of struct stack_frame. */
+ cache->sp = get_frame_sp (this_frame);
+ cache->pc = get_frame_pc (this_frame);
+ /* Choose the frame's base to be gpr15 + sizeof (stack_frame) to be
+ complient with DWARF's DW_CFA_def_cfa. Otherwise gdbarch_inner_than
+ can trigger false stack corruption asserts, as
+
+ next_dwarf_frame_base = next_backchain_frame_base + sizeof (stack_frame)
+ > this_backchain_frame_base
+ */
+ cache->frame_base = cache->sp + TYPE_LENGTH (lk_type ("stack_frame"));
+
+ backchain_addr = cache->sp + lk_offset ("stack_frame->back_chain");
+ backchain = lk_read_addr (backchain_addr);
+
+ /* A zero backchain marks the end of this stack. This can lead to two
+ actions (handled by SIGTRAMP_FRAME unwinder):
+ * stop unwinding (if sp at the end of the kernel stack)
+ * jump to next stack location (otherwise).
+ */
+ if (backchain == 0)
+ {
+ CORE_ADDR pt_regs = cache->sp + TYPE_LENGTH (lk_type ("stack_frame"));
+
+ {
+ /* A bug in the kernel (linux 3.10+) adds the stack overhead twice
+ for swapper tasks (!= swapper/0) with the information written in
+ the first (higher address) pt_regs. Compensate this by updating
+ the stack pointer. */
+ enum s390_lk_stack_location stack;
+
+ CORE_ADDR task = frame_get_thread (this_frame)->ptid.tid ();
+ long pid = frame_get_thread (this_frame)->ptid.lwp ();
+ stack = s390_lk_get_stack_location (task, cache->sp);
+ if (pid == 0 && task != lk_address ("init_task")
+ && stack == S390_LK_STACK_KERNEL)
+ pt_regs += (TYPE_LENGTH (lk_type ("stack_frame"))
+ + TYPE_LENGTH (lk_type ("pt_regs")));
+ }
+
+ cache->zero_backchain = true;
+ s390_lk_unwind_set_gpr (cache, S390_R15_REGNUM, pt_regs);
+
+ /* Use pc = 0 to mark end of stack. */
+ s390_lk_unwind_set_gpr (cache, S390_R14_REGNUM, backchain_addr);
+ return cache;
+ }
+
+ /* Do sanity check. */
+ prev_gpr15 = lk_read_addr (backchain
+ + s390_lk_stack_frame_gpr (S390_R15_REGNUM));
+ if (backchain != prev_gpr15)
+ {
+ size_t ptr_len = lk_builtin_type_size (unsigned_long);
+ CORE_ADDR task = frame_get_thread (this_frame)->ptid.tid ();
+ error (_("Stack corruption for task 0x%s at stack frame 0x%s with "
+ "back_chain 0x%s detected %s. back_chain->gpr15 != back_chain."),
+ phex (task, ptr_len), phex (cache->sp, ptr_len),
+ phex (backchain, ptr_len), phex (prev_gpr15, ptr_len));
+ }
+
+ s390_lk_unwind_set_gpr (cache, S390_R15_REGNUM, backchain_addr);
+ s390_lk_unwind_set_gpr (cache, S390_R14_REGNUM,
+ backchain + s390_lk_stack_frame_gpr (S390_R14_REGNUM));
+
+ return cache;
+}
+
+/* Implement frame_unwind->this_id for NORMAL_FRAMEs. */
+
+static void
+s390_lk_frame_this_id (struct frame_info *this_frame,
+ void **this_cache,
+ struct frame_id *this_id)
+{
+ s390_lk_unwind_cache *cache
+ = s390_lk_frame_unwind_cache (this_frame, this_cache);
+
+ /* If we don't have a stack frame... */
+ if (cache->sp == -1)
+ {
+ /* ...but a PC. We have a inline frame. */
+ if (cache->pc != -1)
+ *this_id = frame_id_build_unavailable_stack (cache->pc);
+ return;
+ }
+ *this_id = frame_id_build (cache->frame_base, cache->pc);
+}
+
+/* Implement frame_unwind->prev_register for NORMAL and SIGTRAMP_FRAMEs. */
+
+static struct value *
+s390_lk_frame_prev_register (struct frame_info *this_frame,
+ void **this_cache, int regnum)
+{
+ s390_lk_unwind_cache *cache
+ = s390_lk_frame_unwind_cache (this_frame, this_cache);
+
+ /* Also handles S390_SP_REGNUM and S390_RETADDR_REGNUM as they are mapped to
+ R15 and R14 respectfully in s390-tdep.h. */
+ if (regnum >= S390_R0_REGNUM && regnum <= S390_R15_REGNUM)
+ return s390_lk_unwind_get_gpr (cache, regnum);
+
+ /* Use PSWM stored in pt_regs if available. */
+ if (regnum == S390_PSWM_REGNUM)
+ return (cache->pswm != -1
+ ? frame_unwind_got_memory (cache->frame, regnum, cache->pswm)
+ : frame_unwind_got_optimized (cache->frame, regnum));
+
+ /* Use PSWA stored in pt_regs if available, R14/PC otherwise. */
+ if (regnum == S390_PSWA_REGNUM)
+ return (cache->pswa != -1
+ ? frame_unwind_got_memory (cache->frame, regnum, cache->pswa)
+ : s390_lk_unwind_get_gpr (cache, S390_RETADDR_REGNUM));
+
+ if (regnum >= S390_NUM_REGS)
+ return s390_unwind_pseudo_register (cache->frame, regnum);
+
+ /* Default is not saved. */
+ return frame_unwind_got_optimized (cache->frame, regnum);
+}
+
+/* Implement frame_unwind->sniffer for NORMAL_FRAMEs. */
+
+static int
+s390_lk_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_cache)
+{
+ if (!target_is_pushed (lk_target_ops))
+ return 0;
+
+ return 1;
+}
+
+/* Simple backchain unwinder for Linux kernel on S390. Its main purpose is
+ to handle stack frames created in Assembler code without debug
+ infromation. */
+
+static const struct frame_unwind s390_lk_frame_unwind = {
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ s390_lk_frame_this_id,
+ s390_lk_frame_prev_register,
+ NULL,
+ s390_lk_frame_sniffer
+};
+
+/* Unwind a single SIGTRAMP_FRAME, i.e. a struct pt_regs. */
+
+static struct s390_lk_unwind_cache *
+s390_lk_sigtramp_unwind_cache (struct frame_info *this_frame,
+ void **this_cache)
+{
+ if (*this_cache)
+ return (s390_lk_unwind_cache *) *this_cache;
+
+ s390_lk_unwind_cache *cache = s390_lk_alloc_unwind_cache ();
+ *this_cache = cache;
+
+ cache->frame = this_frame;
+ /* For SIGTRAMP_FRAMES, cache->sp = lowest address of struct pt_regs. */
+ cache->sp = get_frame_sp (this_frame);
+ cache->pc = cache->sp + s390_lk_pt_regs_gpr (S390_R14_REGNUM);
+ /* Choose the frame base to be SP + sizeof (pt_regs) aka. the end of this
+ stack. */
+ cache->frame_base = cache->sp + TYPE_LENGTH (lk_type ("pt_regs"));
+
+ cache->pswm = cache->sp + lk_offset ("pt_regs->psw->mask");
+ cache->pswa = cache->sp + lk_offset ("pt_regs->psw->addr");
+
+ for (int i = S390_R0_REGNUM; i <= S390_R15_REGNUM; i++)
+ s390_lk_unwind_set_gpr (cache, i, cache->sp + s390_lk_pt_regs_gpr (i));
+
+ return cache;
+}
+
+/* Implement frame_unwind->this_id for SIGTRAMP_FRAMEs. */
+
+static void
+s390_lk_sigtramp_this_id (struct frame_info *this_frame,
+ void **this_cache,
+ struct frame_id *this_id)
+{
+ s390_lk_unwind_cache *cache
+ = s390_lk_sigtramp_unwind_cache (this_frame, this_cache);
+
+ CORE_ADDR task = frame_get_thread (this_frame)->ptid.tid ();
+
+ switch (s390_lk_get_stack_location (task, cache->sp))
+ {
+ /* If we are on an interrupt stack keep on unwinding. */
+ case S390_LK_STACK_ASYNC:
+ case S390_LK_STACK_PANIC:
+ case S390_LK_STACK_RESTART:
+ *this_id = frame_id_build (cache->frame_base, cache->pc);
+ return;
+
+ /* If we are on the kernel stack check whether we are at the end of
+ the stack. If so stop unwinding otherwise continue. */
+ case S390_LK_STACK_KERNEL:
+ {
+ CORE_ADDR top;
+
+ top = lk_read_addr (task + lk_offset ("task_struct->stack"));
+ top += S390_LK_STACKSIZE;
+
+ /* swapper/0 doesn't have a pt_regs at the top of its stack, so in
+ this case cache->sp pointing at the top of the last stack_frame
+ points at the end of the stack. */
+ if (task == lk_address ("init_task") && top <= cache->sp)
+ *this_id = outer_frame_id;
+
+ /* For all other tasks cache->frame_base pointing at the top of
+ pt_regs points at the end of stack. */
+ else if (top <= cache->frame_base)
+ *this_id = outer_frame_id;
+
+ /* The program check handler appends his stack to the kernel stack.
+ If that is the case simply keep on unwinding. */
+ else
+ *this_id = frame_id_build (cache->frame_base, cache->pc);
+
+ return;
+ }
+
+ /* Otherwise somewhere something went wrong. */
+ default:
+ {
+ size_t ptr_len = lk_builtin_type_size (unsigned_long);
+ error (_("Couldn't find find valid stack for task 0x%s with stack "
+ "pointer 0x%s. Stack corruption?"),
+ phex (task, ptr_len), phex (cache->sp, ptr_len));
+ }
+ }
+}
+
+/* Implement frame_unwind->sniffer for SIGTRAMP_FRAMEs. */
+
+static int
+s390_lk_sigtramp_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_cache)
+{
+ if (!target_is_pushed (lk_target_ops))
+ return 0;
+
+ return get_frame_pc (this_frame) == 0;
+}
+
+/* Sigtramp unwinder for Linux kernel on S390. It handles situations when
+ the end of a stack, i.e. a zero backchain, was detected. */
+
+static const struct frame_unwind s390_lk_sigtramp_unwind = {
+ SIGTRAMP_FRAME,
+ default_frame_unwind_stop_reason,
+ s390_lk_sigtramp_this_id,
+ s390_lk_frame_prev_register,
+ NULL,
+ s390_lk_sigtramp_sniffer
+};
+
+/* Frame base handling. */
+
+static CORE_ADDR
+s390_lk_frame_base_address (struct frame_info *this_frame, void **this_cache)
+{
+ struct s390_lk_unwind_cache *cache
+ = s390_lk_frame_unwind_cache (this_frame, this_cache);
+ return cache->frame_base;
+}
+
+static const struct frame_base s390_lk_frame_base = {
+ &s390_lk_frame_unwind,
+ s390_lk_frame_base_address,
+ s390_lk_frame_base_address,
+ s390_lk_frame_base_address
+};
+
+/* Implement gdbarch get_new_lk_ops hook. */
+
+static linux_kernel_ops *
+s390_get_new_lk_ops (struct gdbarch *gdbarch, struct target_ops *target)
+{
+ return new s390_linux_kernel_ops (target);
+}
+
+/* Implement gdbarch iterate_over_regset_sections hook. */
+
+static void
+s390_lk_iterate_over_regset_sections (struct gdbarch *gdbarch,
+ iterate_over_regset_sections_cb *cb,
+ void *cb_data,
+ const struct regcache *regcache)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ cb (".reg", s390x_sizeof_gregset, &s390_gregset, NULL, cb_data);
+ cb (".reg2", s390_sizeof_fpregset, &s390_fpregset, NULL, cb_data);
+ cb (".reg-s390-ctrs", 16 * 8, &s390x_cr_regset, "s390 control registers",
+ cb_data);
+
+ if (tdep->v0_full_regnum != -1)
+ {
+ cb (".reg-s390-vxrs-low", 16 * 8, &s390_vxrs_low_regset,
+ "s390 vector registers 0-15 lower half", cb_data);
+ cb (".reg-s390-vxrs-high", 16 * 16, &s390_vxrs_high_regset,
+ "s390 vector registers 16-31", cb_data);
+ }
+
+ /* Privileged registers for kernel debugging. */
+ if (bfd_get_section_by_name (core_bfd, ".reg-s390-timer"))
+ cb (".reg-s390-timer", 8, &s390x_timer_regset, "s390 timer", cb_data);
+ if (bfd_get_section_by_name (core_bfd, ".reg-s390-todcmp"))
+ cb (".reg-s390-todcmp", 8, &s390x_todcmp_regset,
+ "s390 clock comperator", cb_data);
+ if (bfd_get_section_by_name (core_bfd, ".reg-s390-todpreg"))
+ cb (".reg-s390-todpreg", 8, &s390x_todpreg_regset,
+ "s390 TOD programable register", cb_data);
+ if (bfd_get_section_by_name (core_bfd, ".reg-s390-prefix"))
+ cb (".reg-s390-prefix", 4, &s390x_prefix_regset,
+ "s390 prefix area", cb_data);
+}
+
+/* Implement gdbarch core_read_description hook. */
+
+static const struct target_desc *
+s390_lk_core_read_description (struct gdbarch *gdbarch,
+ struct target_ops *target, bfd *abfd)
+{
+ CORE_ADDR hwcap = 0;
+
+ target_auxv_search (target, AT_HWCAP, &hwcap);
+
+ if (hwcap & HWCAP_S390_VX)
+ return tdesc_s390x_vxcr_linux64;
+ else
+ return tdesc_s390x_cr_linux64;
+}
+
+/* Initialize Linux kernel specific gdbarch hooks. */
+
+static void
+s390_lk_init_abi_64 (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ const struct target_desc *tdesc = info.target_desc;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ tdep->abi = ABI_LINUX_ZSERIES;
+ if (!tdesc_has_registers (tdesc))
+ tdesc = tdesc_s390x_cr_linux64;
+ tdep->tdesc = tdesc;
+
+ /* Register handling. */
+ set_gdbarch_core_read_description (gdbarch, s390_lk_core_read_description);
+ set_gdbarch_iterate_over_regset_sections (gdbarch,
+ s390_lk_iterate_over_regset_sections);
+ /* Frame handling. */
+ frame_unwind_append_unwinder (gdbarch, &s390_lk_sigtramp_unwind);
+ frame_unwind_append_unwinder (gdbarch, &s390_lk_frame_unwind);
+
+ /* Support linux kernel debugging. */
+ set_gdbarch_get_new_lk_ops (gdbarch, s390_get_new_lk_ops);
+}
+
+/* From the ELF-headers point of view Linux kernel- and user-space binaries
+ are the same. So we have to rely on some heuristics to distinguish them.
+
+ For the heuristic we check for:
+ * the prefix register section in dumps.
+ * the __ksymtab section in the vmlinux and modules .ko files.
+ */
+
+static enum gdb_osabi
+s390_lk_osabi_sniffer (bfd *abfd)
+{
+ if (bfd_get_section_by_name (abfd, ".reg-s390-prefix")
+ || bfd_get_section_by_name (abfd, "__ksymtab"))
+ return GDB_OSABI_LINUX_KERNEL;
+
+ return GDB_OSABI_UNKNOWN;
+}
+
+extern initialize_file_ftype _initialize_s390_lk_tdep; /* -Wmissing-prototypes */
+
+void
+_initialize_s390_lk_tdep (void)
+{
+ /* Hook us into the OSABI mechanism. */
+ gdbarch_register_osabi (bfd_arch_s390, bfd_mach_s390_64, GDB_OSABI_LINUX_KERNEL,
+ s390_lk_init_abi_64);
+ /* Add OSABI sniffer. */
+ gdbarch_register_osabi_sniffer (bfd_arch_s390, bfd_target_elf_flavour,
+ s390_lk_osabi_sniffer);
+
+ /* Initialize the Linux kernel target descriptions. */
+ initialize_tdesc_s390x_cr_linux64 ();
+ initialize_tdesc_s390x_vxcr_linux64 ();
+}
diff --git a/gdb/s390-lk-tdep.h b/gdb/s390-lk-tdep.h
new file mode 100644
index 0000000000..e972d50167
--- /dev/null
+++ b/gdb/s390-lk-tdep.h
@@ -0,0 +1,39 @@
+/* Target-dependent code for linux-kernel target on S390.
+ Copyright (C) 2017 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 <http://www.gnu.org/licenses/>. */
+
+#ifndef S390_LK_TDEP_H
+#define S390_LK_TDEP_H
+
+/* Constants copied from kernel sources. */
+#define S390_LK_PAGESIZE (1UL << 12)
+#define S390_LK_STACKSIZE (S390_LK_PAGESIZE << 2)
+#define S390_LK_ASYNCSIZE (S390_LK_STACKSIZE)
+
+/* Short hand access to gprs stored in struct pt_regs. */
+#define s390_lk_pt_regs_gpr(regnum) \
+ (lk_offset ("pt_regs->gprs") \
+ + (FIELD_TARGET_SIZE (lk_field ("pt_regs->gprs")) \
+ * ((regnum) - S390_R0_REGNUM))) \
+
+/* Short hand access to gprs stored in struct stack_frame. */
+#define s390_lk_stack_frame_gpr(regnum) \
+ (lk_offset ("stack_frame->gprs") \
+ + (FIELD_TARGET_SIZE (lk_field ("stack_frame->gprs")) \
+ * ((regnum) - S390_R6_REGNUM))) \
+
+#endif /* S390_LK_TDEP_H */
diff --git a/gdb/s390-tdep.c b/gdb/s390-tdep.c
index 07b02afe3d..fc27a26702 100644
--- a/gdb/s390-tdep.c
+++ b/gdb/s390-tdep.c
@@ -2154,7 +2154,7 @@ s390_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)

/* Helper routine to unwind pseudo registers. */

-static struct value *
+struct value *
s390_unwind_pseudo_register (struct frame_info *this_frame, int regnum)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
@@ -2280,7 +2280,6 @@ s390_trad_frame_prev_register (struct frame_info *this_frame,
else
return s390_unwind_pseudo_register (this_frame, regnum);
}
-
/* Normal stack frames. */

struct s390_unwind_cache {
@@ -6790,6 +6789,10 @@ s390_tdesc_valid (struct gdbarch_tdep *tdep,
static const char *const gs_bc[] = {
"bc_gsd", "bc_gssm", "bc_gsepla",
};
+ static const char *const cr[] = {
+ "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",
+ "cr8", "cr9", "cr10", "cr11", "cr12", "cr13", "cr14", "cr15"
+ };

const struct target_desc *tdesc = tdep->tdesc;
const struct tdesc_feature *feature;
@@ -6891,6 +6894,34 @@ s390_tdesc_valid (struct gdbarch_tdep *tdep,
gs_bc);
}

+ /* Control registers. */
+ feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.cr");
+ if (feature)
+ s390_validate_reg_range (feature, tdesc_data, S390_CR0_REGNUM, cr);
+
+ /* Privileged registers. */
+ feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.privileged");
+ if (feature)
+ {
+ if (!tdesc_numbered_register (feature, tdesc_data,
+ S390_TIMER_REGNUM, "timer"))
+ return false;
+
+ if (!tdesc_numbered_register (feature, tdesc_data,
+ S390_TODCMP_REGNUM, "todcmp"))
+ return false;
+
+ if (!tdesc_numbered_register (feature, tdesc_data,
+ S390_TODPREG_REGNUM, "todpreg"))
+ return false;
+
+ if (!tdesc_numbered_register (feature, tdesc_data,
+ S390_PREFIX_REGNUM, "prefix"))
+ return false;
+
+ tdep->have_privileged = true;
+ }
+
return true;
}

@@ -6918,6 +6949,7 @@ s390_gdbarch_tdep_alloc ()
tdep->have_tdb = false;
tdep->have_vx = false;
tdep->have_gs = false;
+ tdep->have_privileged = false;

tdep->s390_syscall_record = NULL;

diff --git a/gdb/s390-tdep.h b/gdb/s390-tdep.h
index a565f72d9c..63f2481010 100644
--- a/gdb/s390-tdep.h
+++ b/gdb/s390-tdep.h
@@ -60,6 +60,7 @@ struct gdbarch_tdep
bool have_tdb;
bool have_vx;
bool have_gs;
+ bool have_privileged;

/* Hook to record OS specific systemcall. */
int (*s390_syscall_record) (struct regcache *regcache, LONGEST svc_number);
@@ -329,12 +330,77 @@ enum
#define S390_RETADDR_REGNUM S390_R14_REGNUM
#define S390_FRAME_REGNUM S390_R11_REGNUM

+/* Definitions for address translation. */
+/* DAT Table types. */
+#define S390_LK_DAT_TT_REGION1 3
+#define S390_LK_DAT_TT_REGION2 2
+#define S390_LK_DAT_TT_REGION3 1
+#define S390_LK_DAT_TT_SEGMENT 0
+
+/* Region-First-Table */
+#define S390_LK_RFTE_TL 0x3ULL /* Table-Length */
+#define S390_LK_RFTE_TT 0xcULL /* Table-Type */
+#define S390_LK_RFTE_I 0x20ULL /* Region-Invalid Bit */
+#define S390_LK_RFTE_TF 0xc0ULL /* Table Offset */
+#define S390_LK_RFTE_P 0x200ULL /* DAT-Protection Bit */
+#define S390_LK_RFTE_O ~0xfffULL /* Region-Second-Table Origin */
+
+/* Region-Second-Table flags. */
+#define S390_LK_RSTE_TL 0x3ULL /* Table-Length */
+#define S390_LK_RSTE_TT 0xcULL /* Table-Type */
+#define S390_LK_RSTE_I 0x20ULL /* Region-Invalid Bit */
+#define S390_LK_RSTE_TF 0xc0ULL /* Table Offset */
+#define S390_LK_RSTE_P 0x200ULL /* DAT-Protection Bit */
+#define S390_LK_RSTE_O ~0xfffULL /* Region-Third-Table Origin */
+
+/* Region-Third-Table flags. */
+#define S390_LK_RTTE_TL 0x3ULL /* Table-Length */
+#define S390_LK_RTTE_TT 0xcULL /* Table-Type */
+#define S390_LK_RTTE_CR 0x10ULL /* Common-Region Bit */
+#define S390_LK_RTTE_I 0x20ULL /* Region-Invalid Bit */
+#define S390_LK_RTTE_TF 0xc0ULL /* Table Offset */
+#define S390_LK_RTTE_P 0x200ULL /* DAT-Protection Bit */
+#define S390_LK_RTTE_FC 0x400ULL /* Format-Control Bit */
+#define S390_LK_RTTE_F 0x800ULL /* Fetch-Protection Bit */
+#define S390_LK_RTTE_ACC 0xf000ULL /* Access-Control Bits */
+#define S390_LK_RTTE_AV 0x10000ULL /* ACCF-Validity Control */
+#define S390_LK_RTTE_O ~0xfffULL /* Segment-Table Origin */
+#define S390_LK_RTTE_RFAA ~0x7fffffffULL /* Region-Frame Absolute Address */
+
+/* Segment-Table flags. */
+#define S390_LK_STE_TT 0xcULL /* Table-Type */
+#define S390_LK_STE_I 0x20ULL /* Segment-Invalid Bit */
+#define S390_LK_STE_TF 0xc0ULL /* Table Offset */
+#define S390_LK_STE_P 0x200ULL /* DAT-Protection Bit */
+#define S390_LK_STE_FC 0x400ULL /* Format-Control Bit */
+#define S390_LK_STE_F 0x800ULL /* Fetch-Protection Bit */
+#define S390_LK_STE_ACC 0xf000ULL /* Access-Control Bits */
+#define S390_LK_STE_AV 0x10000ULL /* ACCF-Validity Control */
+#define S390_LK_STE_O ~0x7ffULL /* Page-Table Origin */
+#define S390_LK_STE_SFAA ~0xfffffULL /* Segment-Frame Absolute Address */
+
+/* Page-Table flags. */
+#define S390_LK_PTE_P 0x200ULL /* DAT-Protection Bit */
+#define S390_LK_PTE_I 0x400ULL /* Page-Invalid Bit */
+#define S390_LK_PTE_PFAA ~0xfffULL /* Page-Frame Absolute Address */
+
+/* Virtual Address Fields. */
+#define S390_LK_VADDR_RFX 0xffe0000000000000ULL
+#define S390_LK_VADDR_RSX 0x001ffc0000000000ULL
+#define S390_LK_VADDR_RTX 0x000003ff80000000ULL
+#define S390_LK_VADDR_SX 0x000000007ff00000ULL
+#define S390_LK_VADDR_PX 0x00000000000ff000ULL
+#define S390_LK_VADDR_BX 0x0000000000000fffULL
+
/* Frame unwinding. */

extern struct value *s390_trad_frame_prev_register
(struct frame_info *this_frame, struct trad_frame_saved_reg saved_regs[],
int regnum);

+extern struct value *s390_unwind_pseudo_register (struct frame_info *this_frame,
+ int regnum);
+
extern struct target_desc *tdesc_s390_linux32;
extern struct target_desc *tdesc_s390x_linux64;

--
2.13.5