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Use register maps for gp regsets on FreeBSD/x86 core dumps.

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In particular, this permits reporting the value of the $ds, $es, $fs,
and $gs segment registers from amd64 core dumps since they are stored
as 16-bit values rather than the 32-bit size assumed by i386_gregset.
This commit is contained in:
John Baldwin
2022-01-28 11:14:37 -08:00
parent b623bbc9a5
commit a423c9f392
2 changed files with 87 additions and 60 deletions
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58
gdb/i386-fbsd-tdep.c
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@ -32,6 +32,42 @@
#include "solib-svr4.h"
#include "inferior.h"
/* The general-purpose regset consists of 19 32-bit slots. */
#define I386_FBSD_SIZEOF_GREGSET (19 * 4)
/* Register maps. */
static const struct regcache_map_entry i386_fbsd_gregmap[] =
{
{ 1, I386_FS_REGNUM, 4 },
{ 1, I386_ES_REGNUM, 4 },
{ 1, I386_DS_REGNUM, 4 },
{ 1, I386_EDI_REGNUM, 0 },
{ 1, I386_ESI_REGNUM, 0 },
{ 1, I386_EBP_REGNUM, 0 },
{ 1, REGCACHE_MAP_SKIP, 4 }, /* isp */
{ 1, I386_EBX_REGNUM, 0 },
{ 1, I386_EDX_REGNUM, 0 },
{ 1, I386_ECX_REGNUM, 0 },
{ 1, I386_EAX_REGNUM, 0 },
{ 1, REGCACHE_MAP_SKIP, 4 }, /* trapno */
{ 1, REGCACHE_MAP_SKIP, 4 }, /* err */
{ 1, I386_EIP_REGNUM, 0 },
{ 1, I386_CS_REGNUM, 4 },
{ 1, I386_EFLAGS_REGNUM, 0 },
{ 1, I386_ESP_REGNUM, 0 },
{ 1, I386_SS_REGNUM, 4 },
{ 1, I386_GS_REGNUM, 4 },
{ 0 }
};
/* Register set definitions. */
const struct regset i386_fbsd_gregset =
{
i386_fbsd_gregmap, regcache_supply_regset, regcache_collect_regset
};
/* Support for signal handlers. */
/* Return whether THIS_FRAME corresponds to a FreeBSD sigtramp
@ -111,17 +147,6 @@ i386fbsd_sigtramp_p (struct frame_info *this_frame)
return 1;
}
/* From <machine/reg.h>. */
static int i386fbsd_r_reg_offset[] =
{
10 * 4, 9 * 4, 8 * 4, 7 * 4, /* %eax, %ecx, %edx, %ebx */
16 * 4, 5 * 4, /* %esp, %ebp */
4 * 4, 3 * 4, /* %esi, %edi */
13 * 4, 15 * 4, /* %eip, %eflags */
14 * 4, 17 * 4, /* %cs, %ss */
2 * 4, 1 * 4, 0 * 4, 18 * 4 /* %ds, %es, %fs, %gs */
};
/* From <machine/signal.h>. */
int i386fbsd_sc_reg_offset[] =
{
@ -229,8 +254,8 @@ i386fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
{
i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (gdbarch);
cb (".reg", tdep->sizeof_gregset, tdep->sizeof_gregset, &i386_gregset, NULL,
cb_data);
cb (".reg", I386_FBSD_SIZEOF_GREGSET, I386_FBSD_SIZEOF_GREGSET,
&i386_fbsd_gregset, NULL, cb_data);
cb (".reg2", tdep->sizeof_fpregset, tdep->sizeof_fpregset, &i386_fpregset,
NULL, cb_data);
@ -276,11 +301,8 @@ i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
/* Obviously FreeBSD is BSD-based. */
i386bsd_init_abi (info, gdbarch);
/* FreeBSD has a different `struct reg', and reserves some space for
its FPU emulator in `struct fpreg'. */
tdep->gregset_reg_offset = i386fbsd_r_reg_offset;
tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd_r_reg_offset);
tdep->sizeof_gregset = 19 * 4;
/* FreeBSD reserves some space for its FPU emulator in
`struct fpreg'. */
tdep->sizeof_fpregset = 176;
/* FreeBSD uses -freg-struct-return by default. */