Merge {i386,amd64}_linux_read_description
This commit merges i386_ and amd64_linux_read_description, renaming both to x86_linux_read_description. gdb/ 2014-07-11 Gary Benson <gbenson@redhat.com> * amd64-linux-nat.c (amd64_linux_read_description): Renamed to x86_linux_read_description. All uses updated. amd64-specific code conditionalized. Conditionalized i386-specific code added. Redundant cast removed. * i386-linux-nat.c (i386_linux_read_description): Renamed to x86_linux_read_description. All uses updated. i386-specific code conditionalized. Conditionalized amd64-specific code added. One sizeof replaced with the actual type it is describing.
This commit is contained in:
Gary Benson
parent
2acf3cd065
commit
cb1da100b6
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@ -1,3 +1,14 @@
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2014-07-11 Gary Benson <gbenson@redhat.com>
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* amd64-linux-nat.c (amd64_linux_read_description): Renamed to
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x86_linux_read_description. All uses updated. amd64-specific
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code conditionalized. Conditionalized i386-specific code added.
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Redundant cast removed.
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* i386-linux-nat.c (i386_linux_read_description): Renamed to
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x86_linux_read_description. All uses updated. i386-specific
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code conditionalized. Conditionalized amd64-specific code added.
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One sizeof replaced with the actual type it is describing.
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2014-07-11 Gary Benson <gbenson@redhat.com>
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* amd64-linux-nat.c (amd64_linux_dr_get): Renamed to
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@ -1034,55 +1034,75 @@ amd64_linux_siginfo_fixup (siginfo_t *native, gdb_byte *inf, int direction)
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return 0;
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}
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/* Get Linux/x86 target description from running target.
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#ifdef __x86_64__
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/* Value of CS segment register:
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64bit process: 0x33
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32bit process: 0x23 */
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#define AMD64_LINUX_USER64_CS 0x33
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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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LP64 process: 0x0
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X32 process: 0x2b */
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#define AMD64_LINUX_X32_DS 0x2b
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#endif
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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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/* Get Linux/x86 target description from running target. */
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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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x86_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_64bit = 0;
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#ifdef __x86_64__
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int is_x32;
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#endif
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static uint64_t xcr0;
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uint64_t xcr0_features_bits;
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/* GNU/Linux LWP ID's are process ID's. */
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tid = ptid_get_lwp (inferior_ptid);
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if (tid == 0)
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tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */
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/* Get CS register. */
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errno = 0;
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cs = ptrace (PTRACE_PEEKUSER, tid,
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offsetof (struct user_regs_struct, cs), 0);
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if (errno != 0)
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perror_with_name (_("Couldn't get CS register"));
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#ifdef __x86_64__
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{
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unsigned long cs;
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unsigned long ds;
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is_64bit = cs == AMD64_LINUX_USER64_CS;
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/* Get CS register. */
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errno = 0;
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cs = ptrace (PTRACE_PEEKUSER, tid,
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offsetof (struct user_regs_struct, cs), 0);
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if (errno != 0)
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perror_with_name (_("Couldn't get CS register"));
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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_64bit = cs == AMD64_LINUX_USER64_CS;
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is_x32 = ds == AMD64_LINUX_X32_DS;
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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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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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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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}
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#elif HAVE_PTRACE_GETFPXREGS
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if (have_ptrace_getfpxregs == -1)
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{
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elf_fpxregset_t fpxregs;
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if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0)
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{
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have_ptrace_getfpxregs = 0;
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have_ptrace_getregset = 0;
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return tdesc_i386_mmx_linux;
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}
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}
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#endif
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if (have_ptrace_getregset == -1)
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{
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@ -1094,7 +1114,7 @@ amd64_linux_read_description (struct target_ops *ops)
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/* Check if PTRACE_GETREGSET works. */
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if (ptrace (PTRACE_GETREGSET, tid,
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(unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
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(unsigned int) NT_X86_XSTATE, &iov) < 0)
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have_ptrace_getregset = 0;
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else
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{
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@ -1106,66 +1126,61 @@ amd64_linux_read_description (struct target_ops *ops)
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}
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}
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/* Check the native XCR0 only if PTRACE_GETREGSET is available. */
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if (have_ptrace_getregset && (xcr0 & I386_XSTATE_ALL_MASK))
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{
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switch (xcr0 & I386_XSTATE_ALL_MASK)
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{
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case I386_XSTATE_MPX_AVX512_MASK:
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case I386_XSTATE_AVX512_MASK:
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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_avx512_linux;
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else
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return tdesc_amd64_avx512_linux;
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}
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else
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return tdesc_i386_avx512_linux;
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case I386_XSTATE_MPX_MASK:
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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; /* No MPX on x32 using AVX. */
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else
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return tdesc_amd64_mpx_linux;
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}
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else
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return tdesc_i386_mpx_linux;
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case I386_XSTATE_AVX_MASK:
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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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default:
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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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}
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/* Check the native XCR0 only if PTRACE_GETREGSET is available. If
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PTRACE_GETREGSET is not available then set xcr0_features_bits to
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zero so that the "no-features" descriptions are returned by the
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switches below. */
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if (have_ptrace_getregset)
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xcr0_features_bits = xcr0 & I386_XSTATE_ALL_MASK;
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else
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xcr0_features_bits = 0;
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if (is_64bit)
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{
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if (is_64bit)
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#ifdef __x86_64__
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switch (xcr0_features_bits)
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{
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case I386_XSTATE_MPX_AVX512_MASK:
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case I386_XSTATE_AVX512_MASK:
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if (is_x32)
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return tdesc_x32_avx512_linux;
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else
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return tdesc_amd64_avx512_linux;
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case I386_XSTATE_MPX_MASK:
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if (is_x32)
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return tdesc_x32_avx_linux; /* No MPX on x32 using AVX. */
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else
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return tdesc_amd64_mpx_linux;
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case I386_XSTATE_AVX_MASK:
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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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default:
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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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#endif
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}
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else
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{
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switch (xcr0_features_bits)
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{
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case I386_XSTATE_MPX_AVX512_MASK:
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case I386_XSTATE_AVX512_MASK:
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return tdesc_i386_avx512_linux;
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case I386_XSTATE_MPX_MASK:
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return tdesc_i386_mpx_linux;
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case I386_XSTATE_AVX_MASK:
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return tdesc_i386_avx_linux;
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default:
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return tdesc_i386_linux;
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}
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}
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gdb_assert_not_reached ("failed to return tdesc");
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}
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/* Enable branch tracing. */
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@ -1257,7 +1272,7 @@ _initialize_amd64_linux_nat (void)
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t->to_fetch_registers = amd64_linux_fetch_inferior_registers;
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t->to_store_registers = amd64_linux_store_inferior_registers;
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t->to_read_description = amd64_linux_read_description;
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t->to_read_description = x86_linux_read_description;
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/* Add btrace methods. */
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t->to_supports_btrace = linux_supports_btrace;
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@ -995,20 +995,63 @@ x86_linux_child_post_startup_inferior (struct target_ops *self, ptid_t ptid)
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super_post_startup_inferior (self, ptid);
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}
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#ifdef __x86_64__
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/* Value of CS segment register:
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64bit process: 0x33
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32bit process: 0x23 */
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#define AMD64_LINUX_USER64_CS 0x33
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/* Value of DS segment register:
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LP64 process: 0x0
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X32 process: 0x2b */
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#define AMD64_LINUX_X32_DS 0x2b
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#endif
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/* Get Linux/x86 target description from running target. */
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static const struct target_desc *
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i386_linux_read_description (struct target_ops *ops)
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x86_linux_read_description (struct target_ops *ops)
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{
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int tid;
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int is_64bit = 0;
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#ifdef __x86_64__
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int is_x32;
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#endif
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static uint64_t xcr0;
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uint64_t xcr0_features_bits;
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/* GNU/Linux LWP ID's are process ID's. */
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tid = ptid_get_lwp (inferior_ptid);
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if (tid == 0)
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tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */
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#ifdef HAVE_PTRACE_GETFPXREGS
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#ifdef __x86_64__
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{
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unsigned long cs;
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unsigned long ds;
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/* Get CS register. */
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errno = 0;
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cs = ptrace (PTRACE_PEEKUSER, tid,
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offsetof (struct user_regs_struct, cs), 0);
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if (errno != 0)
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perror_with_name (_("Couldn't get CS register"));
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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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}
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#elif HAVE_PTRACE_GETFPXREGS
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if (have_ptrace_getfpxregs == -1)
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{
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elf_fpxregset_t fpxregs;
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@ -1031,8 +1074,8 @@ i386_linux_read_description (struct target_ops *ops)
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iov.iov_len = sizeof (xstateregs);
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/* Check if PTRACE_GETREGSET works. */
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if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE,
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&iov) < 0)
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if (ptrace (PTRACE_GETREGSET, tid,
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(unsigned int) NT_X86_XSTATE, &iov) < 0)
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have_ptrace_getregset = 0;
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else
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{
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@ -1040,14 +1083,51 @@ i386_linux_read_description (struct target_ops *ops)
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/* Get XCR0 from XSAVE extended state. */
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xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET
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/ sizeof (long long))];
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/ sizeof (uint64_t))];
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}
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}
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/* Check the native XCR0 only if PTRACE_GETREGSET is available. */
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/* Check the native XCR0 only if PTRACE_GETREGSET is available. If
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PTRACE_GETREGSET is not available then set xcr0_features_bits to
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zero so that the "no-features" descriptions are returned by the
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switches below. */
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if (have_ptrace_getregset)
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xcr0_features_bits = xcr0 & I386_XSTATE_ALL_MASK;
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else
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xcr0_features_bits = 0;
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if (is_64bit)
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{
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switch ((xcr0 & I386_XSTATE_ALL_MASK))
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#ifdef __x86_64__
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switch (xcr0_features_bits)
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{
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case I386_XSTATE_MPX_AVX512_MASK:
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case I386_XSTATE_AVX512_MASK:
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if (is_x32)
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return tdesc_x32_avx512_linux;
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else
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return tdesc_amd64_avx512_linux;
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case I386_XSTATE_MPX_MASK:
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if (is_x32)
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return tdesc_x32_avx_linux; /* No MPX on x32 using AVX. */
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else
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return tdesc_amd64_mpx_linux;
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case I386_XSTATE_AVX_MASK:
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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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default:
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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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#endif
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}
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else
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{
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switch (xcr0_features_bits)
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{
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case I386_XSTATE_MPX_AVX512_MASK:
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case I386_XSTATE_AVX512_MASK:
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@ -1060,8 +1140,8 @@ i386_linux_read_description (struct target_ops *ops)
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return tdesc_i386_linux;
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}
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}
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else
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return tdesc_i386_linux;
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gdb_assert_not_reached ("failed to return tdesc");
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}
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/* Enable branch tracing. */
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@ -1148,7 +1228,7 @@ _initialize_i386_linux_nat (void)
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t->to_fetch_registers = i386_linux_fetch_inferior_registers;
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t->to_store_registers = i386_linux_store_inferior_registers;
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t->to_read_description = i386_linux_read_description;
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t->to_read_description = x86_linux_read_description;
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/* Add btrace methods. */
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t->to_supports_btrace = linux_supports_btrace;
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