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Check DS segment register for x32 process

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* amd64-linux-nat.c (AMD64_LINUX_X32_DS): New.
	(amd64_linux_read_description): Check DS segment register for
	x32 process.
This commit is contained in:
H.J. Lu
2012-06-16 13:26:37 +00:00
parent 8469f797b7
commit 6da38f42ff
2 changed files with 37 additions and 2 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2012-06-15 H.J. Lu <hongjiu.lu@intel.com>
* amd64-linux-nat.c (AMD64_LINUX_X32_DS): New.
(amd64_linux_read_description): Check DS segment register for
x32 process.
2012-06-15 Tom Tromey <tromey@redhat.com> 2012-06-15 Tom Tromey <tromey@redhat.com>
* dwarf2read.c (dw2_find_symbol_file): Unconditionally use * dwarf2read.c (dw2_find_symbol_file): Unconditionally use

29
gdb/amd64-linux-nat.c
View File

@ -755,16 +755,23 @@ amd64_linux_siginfo_fixup (siginfo_t *native, gdb_byte *inf, int direction)
Value of CS segment register: Value of CS segment register:
1. 64bit process: 0x33. 1. 64bit process: 0x33.
2. 32bit process: 0x23. 2. 32bit process: 0x23.
Value of DS segment register:
1. LP64 process: 0x0.
2. X32 process: 0x2b.
*/ */
#define AMD64_LINUX_USER64_CS 0x33 #define AMD64_LINUX_USER64_CS 0x33
#define AMD64_LINUX_X32_DS 0x2b
static const struct target_desc * static const struct target_desc *
amd64_linux_read_description (struct target_ops *ops) amd64_linux_read_description (struct target_ops *ops)
{ {
unsigned long cs; unsigned long cs;
unsigned long ds;
int tid; int tid;
int is_64bit; int is_64bit;
int is_x32;
static uint64_t xcr0; static uint64_t xcr0;
/* GNU/Linux LWP ID's are process ID's. */ /* GNU/Linux LWP ID's are process ID's. */
@ -781,6 +788,18 @@ amd64_linux_read_description (struct target_ops *ops)
is_64bit = cs == AMD64_LINUX_USER64_CS; is_64bit = cs == AMD64_LINUX_USER64_CS;
/* Get DS register. */
errno = 0;
ds = ptrace (PTRACE_PEEKUSER, tid,
offsetof (struct user_regs_struct, ds), 0);
if (errno != 0)
perror_with_name (_("Couldn't get DS register"));
is_x32 = ds == AMD64_LINUX_X32_DS;
if (sizeof (void *) == 4 && is_64bit && !is_x32)
error (_("Can't debug 64-bit process with 32-bit GDB"));
if (have_ptrace_getregset == -1) if (have_ptrace_getregset == -1)
{ {
uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))]; uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))];
@ -808,14 +827,24 @@ amd64_linux_read_description (struct target_ops *ops)
&& (xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK) && (xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK)
{ {
if (is_64bit) if (is_64bit)
{
if (is_x32)
return tdesc_x32_avx_linux;
else
return tdesc_amd64_avx_linux; return tdesc_amd64_avx_linux;
}
else else
return tdesc_i386_avx_linux; return tdesc_i386_avx_linux;
} }
else else
{ {
if (is_64bit) if (is_64bit)
{
if (is_x32)
return tdesc_x32_linux;
else
return tdesc_amd64_linux; return tdesc_amd64_linux;
}
else else
return tdesc_i386_linux; return tdesc_i386_linux;
} }