diff options
Diffstat (limited to 'gdb/amd64-linux-nat.c')
| -rw-r--r-- | gdb/amd64-linux-nat.c | 76 |
1 files changed, 57 insertions, 19 deletions
diff --git a/gdb/amd64-linux-nat.c b/gdb/amd64-linux-nat.c index 1b6d0c5..c3b5765 100644 --- a/gdb/amd64-linux-nat.c +++ b/gdb/amd64-linux-nat.c @@ -350,33 +350,71 @@ amd64_linux_dr_get_status (void) } +/* This function is called by libthread_db as part of its handling of + a request for a thread's local storage address. */ + ps_err_e ps_get_thread_area (const struct ps_prochandle *ph, lwpid_t lwpid, int idx, void **base) { -/* This definition comes from prctl.h, but some kernels may not have it. */ + switch (gdbarch_ptr_bit (current_gdbarch) == 32) + { + case bfd_mach_i386_i386: + case bfd_mach_i386_i386_intel_syntax: + { + /* The full structure is found in <asm-i386/ldt.h>. The + second integer is the LDT's base_address and that is used + to locate the thread's local storage. See i386-linux-nat.c + more info. */ + unsigned int desc[4]; + + /* This code assumes that "int" is 32 bits and that + GET_THREAD_AREA returns no more than 4 int values. */ + gdb_assert (sizeof (int) == 4); +#ifndef PTRACE_GET_THREAD_AREA +#define PTRACE_GET_THREAD_AREA 25 +#endif + if (ptrace (PTRACE_GET_THREAD_AREA, + lwpid, (void *) (long) idx, (unsigned long) &desc) < 0) + return PS_ERR; + + /* Extend the value to 64 bits. Here it's assumed that a + "long" and a "void *" are the same. */ + (*base) = (void *) (long) desc[1]; + return PS_OK; + } + + case bfd_mach_x86_64: + case bfd_mach_x86_64_intel_syntax: + /* This definition comes from prctl.h, but some kernels may not + have it. */ #ifndef PTRACE_ARCH_PRCTL #define PTRACE_ARCH_PRCTL 30 #endif - - /* FIXME: ezannoni-2003-07-09 see comment above about include file order. - We could be getting bogus values for these two. */ - gdb_assert (FS < ELF_NGREG); - gdb_assert (GS < ELF_NGREG); - switch (idx) - { - case FS: - if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0) - return PS_OK; - break; - case GS: - if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0) - return PS_OK; - break; - default: /* Should not happen. */ - return PS_BADADDR; + /* FIXME: ezannoni-2003-07-09 see comment above about include + file order. We could be getting bogus values for these two. */ + gdb_assert (FS < ELF_NGREG); + gdb_assert (GS < ELF_NGREG); + switch (idx) + { + case FS: + if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0) + return PS_OK; + break; + case GS: + if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0) + return PS_OK; + break; + default: /* Should not happen. */ + return PS_BADADDR; + } + return PS_ERR; /* ptrace failed. */ + + case bfd_mach_i386_i8086: + internal_error (__FILE__, __LINE__, "bad i8086 machine"); + default: + internal_error (__FILE__, __LINE__, "bad_switch"); } - return PS_ERR; /* ptrace failed. */ } |