diff options
Diffstat (limited to 'gdb/amd64nbsd-tdep.c')
| -rw-r--r-- | gdb/amd64nbsd-tdep.c | 35 |
1 files changed, 12 insertions, 23 deletions
diff --git a/gdb/amd64nbsd-tdep.c b/gdb/amd64nbsd-tdep.c index cc90aee..ffa9110 100644 --- a/gdb/amd64nbsd-tdep.c +++ b/gdb/amd64nbsd-tdep.c @@ -47,18 +47,21 @@ amd64nbsd_sigtramp_p (struct frame_info *next_frame) return nbsd_pc_in_sigtramp (pc, name); } -/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp - routine, return the address of the associated sigcontext structure. */ +/* Assuming NEXT_FRAME is preceded by a frame corresponding to a + NetBSD sigtramp routine, return the address of the associated + mcontext structure. */ static CORE_ADDR -amd64nbsd_sigcontext_addr (struct frame_info *next_frame) +amd64nbsd_mcontext_addr (struct frame_info *next_frame) { - CORE_ADDR sp; + CORE_ADDR addr; - /* The stack pointer points at `struct sigcontext' upon entry of a + /* The register %r15 points at `struct ucontext' upon entry of a signal trampoline. */ - sp = frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM); - return sp; + addr = frame_unwind_register_unsigned (next_frame, AMD64_R15_REGNUM); + + /* The mcontext structure lives as offset 56 in `struct ucontext'. */ + return addr + 56; } /* NetBSD 2.0 or later. */ @@ -99,8 +102,6 @@ static void amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); - int *sc_reg_offset; - int i; /* Initialize general-purpose register set details first. */ tdep->gregset_reg_offset = amd64nbsd_r_reg_offset; @@ -113,21 +114,9 @@ amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) /* NetBSD has its own convention for signal trampolines. */ tdep->sigtramp_p = amd64nbsd_sigtramp_p; - tdep->sigcontext_addr = amd64nbsd_sigcontext_addr; - - /* Initialize the array with register offsets in `struct - sigcontext'. This `struct sigcontext' has an sc_mcontext member - at offset 32, and in <machine/reg.h> we have an explicit comment - saying that `struct reg' is the same as mcontext.__gregs. */ + tdep->sigcontext_addr = amd64nbsd_mcontext_addr; + tdep->sc_reg_offset = amd64nbsd_r_reg_offset; tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset); - tdep->sc_reg_offset = XCALLOC (tdep->sc_num_regs, int); - for (i = 0; i < tdep->sc_num_regs; i++) - { - if (amd64nbsd_r_reg_offset[i] < 0) - tdep->sc_reg_offset[i] = -1; - else - tdep->sc_reg_offset[i] = 32 + amd64nbsd_r_reg_offset[i]; - } /* NetBSD uses SVR4-style shared libraries. */ set_solib_svr4_fetch_link_map_offsets |