diff options
Diffstat (limited to 'gdb/sparc64-linux-tdep.c')
| -rw-r--r-- | gdb/sparc64-linux-tdep.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/gdb/sparc64-linux-tdep.c b/gdb/sparc64-linux-tdep.c index ce1c6cbcf88..8e0498e6817 100644 --- a/gdb/sparc64-linux-tdep.c +++ b/gdb/sparc64-linux-tdep.c @@ -22,7 +22,9 @@ #include "defs.h" #include "frame.h" #include "frame-unwind.h" +#include "regcache.h" #include "gdbarch.h" +#include "gdbcore.h" #include "osabi.h" #include "solib-svr4.h" #include "symtab.h" @@ -98,6 +100,36 @@ sparc64_linux_sigframe_init (const struct tramp_frame *self, trad_frame_set_id (this_cache, frame_id_build (base, func)); } +/* Return the address of a system call's alternative return + address. */ + +static CORE_ADDR +sparc64_linux_step_trap (unsigned long insn) +{ + if (insn == 0x91d0206d) + { + ULONGEST sp; + + regcache_cooked_read_unsigned (current_regcache, + SPARC_SP_REGNUM, &sp); + if (sp & 1) + sp += BIAS; + + /* The kernel puts the sigreturn registers on the stack, + and this is where the signal unwinding state is take from + when returning from a signal. + + A siginfo_t sits 192 bytes from the base of the stack. This + siginfo_t is 128 bytes, and is followed by the sigreturn + register save area. The saved PC sits at a 136 byte offset + into there. */ + + return read_memory_unsigned_integer (sp + 192 + 128 + 136, 8); + } + + return 0; +} + static void sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) @@ -120,6 +152,9 @@ sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) /* Enable TLS support. */ set_gdbarch_fetch_tls_load_module_address (gdbarch, svr4_fetch_objfile_link_map); + + /* Make sure we can single-step over signal return system calls. */ + tdep->step_trap = sparc64_linux_step_trap; } |