Check DS segment register for x32 process
* amd64-linux-nat.c (AMD64_LINUX_X32_DS): New. (amd64_linux_read_description): Check DS segment register for x32 process.
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@ -1,3 +1,9 @@
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2012-06-15 H.J. Lu <hongjiu.lu@intel.com>
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* amd64-linux-nat.c (AMD64_LINUX_X32_DS): New.
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(amd64_linux_read_description): Check DS segment register for
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x32 process.
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2012-06-15 Tom Tromey <tromey@redhat.com>
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* dwarf2read.c (dw2_find_symbol_file): Unconditionally use
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@ -755,16 +755,23 @@ amd64_linux_siginfo_fixup (siginfo_t *native, gdb_byte *inf, int direction)
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Value of CS segment register:
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1. 64bit process: 0x33.
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2. 32bit process: 0x23.
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Value of DS segment register:
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1. LP64 process: 0x0.
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2. X32 process: 0x2b.
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*/
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#define AMD64_LINUX_USER64_CS 0x33
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#define AMD64_LINUX_X32_DS 0x2b
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static const struct target_desc *
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amd64_linux_read_description (struct target_ops *ops)
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{
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unsigned long cs;
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unsigned long ds;
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int tid;
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int is_64bit;
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int is_x32;
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static uint64_t xcr0;
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/* GNU/Linux LWP ID's are process ID's. */
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@ -781,6 +788,18 @@ amd64_linux_read_description (struct target_ops *ops)
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is_64bit = cs == AMD64_LINUX_USER64_CS;
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/* Get DS register. */
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errno = 0;
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ds = ptrace (PTRACE_PEEKUSER, tid,
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offsetof (struct user_regs_struct, ds), 0);
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if (errno != 0)
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perror_with_name (_("Couldn't get DS register"));
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is_x32 = ds == AMD64_LINUX_X32_DS;
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if (sizeof (void *) == 4 && is_64bit && !is_x32)
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error (_("Can't debug 64-bit process with 32-bit GDB"));
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if (have_ptrace_getregset == -1)
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{
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uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))];
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@ -808,14 +827,24 @@ amd64_linux_read_description (struct target_ops *ops)
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&& (xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK)
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{
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if (is_64bit)
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{
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if (is_x32)
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return tdesc_x32_avx_linux;
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else
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return tdesc_amd64_avx_linux;
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}
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else
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return tdesc_i386_avx_linux;
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}
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else
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{
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if (is_64bit)
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{
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if (is_x32)
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return tdesc_x32_linux;
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else
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return tdesc_amd64_linux;
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}
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else
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return tdesc_i386_linux;
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}
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