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2012-05-07 Chung-Lin Tang <cltang@codesourcery.com>

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* sh-linux-tdep.c: Include trad-frame.h and tramp-frame.h.
	(sh_linux_sigtramp_cache): New function.
	(sh_linux_sigreturn_init): New function.
	(sh_linux_rt_sigreturn_init): New function.
	(SH_MOVW,SH_TRAP,SH_OR_R0_R0): New symbols for instruction
	patterns.
	(SH_NR_SIGRETURN,SH_NR_RT_SIGRETURN): New symbols for sigreturn
	syscall codes.
	(sh_linux_sigreturn_tramp_frame): New tramp_frame definition.
	(sh_linux_rt_sigreturn_tramp_frame): Likewise.
	(sh_linux_init_abi): Add init calls to register new tramp_frame
	definitions under 32-bit SH, update comments.
This commit is contained in:
Chung-Lin Tang 2012-05-07 13:17:29 +00:00
parent daac165e45
commit 1e1f659128
2 changed files with 130 additions and 1 deletions
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15
gdb/ChangeLog
View File

@ -1,3 +1,18 @@
2012-05-07 Chung-Lin Tang <cltang@codesourcery.com>
* sh-linux-tdep.c: Include trad-frame.h and tramp-frame.h.
(sh_linux_sigtramp_cache): New function.
(sh_linux_sigreturn_init): New function.
(sh_linux_rt_sigreturn_init): New function.
(SH_MOVW,SH_TRAP,SH_OR_R0_R0): New symbols for instruction
patterns.
(SH_NR_SIGRETURN,SH_NR_RT_SIGRETURN): New symbols for sigreturn
syscall codes.
(sh_linux_sigreturn_tramp_frame): New tramp_frame definition.
(sh_linux_rt_sigreturn_tramp_frame): Likewise.
(sh_linux_init_abi): Add init calls to register new tramp_frame
definitions under 32-bit SH, update comments.
2012-05-07 Pedro Alves <palves@redhat.com>
PR gdb/10952

116
gdb/sh-linux-tdep.c
View File

@ -23,6 +23,9 @@
#include "solib-svr4.h"
#include "symtab.h"
#include "trad-frame.h"
#include "tramp-frame.h"
#include "glibc-tdep.h"
#include "sh-tdep.h"
#include "linux-tdep.h"
@ -70,6 +73,113 @@ static const struct sh_corefile_regmap fpregs_table[] =
{-1 /* Terminator. */, 0}
};
/* SH signal handler frame support. */
static void
sh_linux_sigtramp_cache (struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func, int regs_offset)
{
int i;
struct gdbarch *gdbarch = get_frame_arch (this_frame);
CORE_ADDR base = get_frame_register_unsigned (this_frame,
gdbarch_sp_regnum (gdbarch));
CORE_ADDR regs = base + regs_offset;
for (i = 0; i < 18; i++)
trad_frame_set_reg_addr (this_cache, i, regs + i * 4);
trad_frame_set_reg_addr (this_cache, SR_REGNUM, regs + 18 * 4);
trad_frame_set_reg_addr (this_cache, GBR_REGNUM, regs + 19 * 4);
trad_frame_set_reg_addr (this_cache, MACH_REGNUM, regs + 20 * 4);
trad_frame_set_reg_addr (this_cache, MACL_REGNUM, regs + 21 * 4);
/* Restore FP state if we have an FPU. */
if (gdbarch_fp0_regnum (gdbarch) != -1)
{
CORE_ADDR fpregs = regs + 22 * 4;
for (i = FR0_REGNUM; i <= FP_LAST_REGNUM; i++)
trad_frame_set_reg_addr (this_cache, i, fpregs + i * 4);
trad_frame_set_reg_addr (this_cache, FPSCR_REGNUM, fpregs + 32 * 4);
trad_frame_set_reg_addr (this_cache, FPUL_REGNUM, fpregs + 33 * 4);
}
/* Save a frame ID. */
trad_frame_set_id (this_cache, frame_id_build (base, func));
}
/* Implement struct tramp_frame "init" callbacks for signal
trampolines on 32-bit SH. */
static void
sh_linux_sigreturn_init (const struct tramp_frame *self,
struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
/* SH 32-bit sigframe: sigcontext at start of sigframe,
registers start after a single 'oldmask' word. */
sh_linux_sigtramp_cache (this_frame, this_cache, func, 4);
}
static void
sh_linux_rt_sigreturn_init (const struct tramp_frame *self,
struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
/* SH 32-bit rt_sigframe: starts with a siginfo (128 bytes), then
we can find sigcontext embedded within a ucontext (offset 20 bytes).
Then registers start after a single 'oldmask' word. */
sh_linux_sigtramp_cache (this_frame, this_cache, func,
128 /* sizeof (struct siginfo) */
+ 20 /* offsetof (struct ucontext, uc_mcontext) */
+ 4 /* oldmask word at start of sigcontext */);
}
/* Instruction patterns. */
#define SH_MOVW 0x9305
#define SH_TRAP 0xc300
#define SH_OR_R0_R0 0x200b
/* SH sigreturn syscall numbers. */
#define SH_NR_SIGRETURN 0x0077
#define SH_NR_RT_SIGRETURN 0x00ad
static struct tramp_frame sh_linux_sigreturn_tramp_frame = {
SIGTRAMP_FRAME,
2,
{
{ SH_MOVW, 0xffff },
{ SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_NR_SIGRETURN, 0xffff },
{ TRAMP_SENTINEL_INSN }
},
sh_linux_sigreturn_init
};
static struct tramp_frame sh_linux_rt_sigreturn_tramp_frame = {
SIGTRAMP_FRAME,
2,
{
{ SH_MOVW, 0xffff },
{ SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_NR_RT_SIGRETURN, 0xffff },
{ TRAMP_SENTINEL_INSN }
},
sh_linux_rt_sigreturn_init
};
static void
sh_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
@ -84,13 +194,17 @@ sh_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
/* Core files are supported for 32-bit SH only, at present. */
/* Core files and signal handler frame unwinding are supported for
32-bit SH only, at present. */
if (info.bfd_arch_info->mach != bfd_mach_sh5)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
tdep->core_gregmap = (struct sh_corefile_regmap *)gregs_table;
tdep->core_fpregmap = (struct sh_corefile_regmap *)fpregs_table;
tramp_frame_prepend_unwinder (gdbarch, &sh_linux_sigreturn_tramp_frame);
tramp_frame_prepend_unwinder (gdbarch, &sh_linux_rt_sigreturn_tramp_frame);
}
}