diff options
| -rw-r--r-- | gdb/ChangeLog | 15 | ||||
| -rw-r--r-- | gdb/sh-linux-tdep.c | 116 |
2 files changed, 130 insertions, 1 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 8af119b..53b4c2c 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,18 @@ +2012-05-07 Chung-Lin Tang <cltang@codesourcery.com> + + * sh-linux-tdep.c: Include trad-frame.h and tramp-frame.h. + (sh_linux_sigtramp_cache): New function. + (sh_linux_sigreturn_init): New function. + (sh_linux_rt_sigreturn_init): New function. + (SH_MOVW,SH_TRAP,SH_OR_R0_R0): New symbols for instruction + patterns. + (SH_NR_SIGRETURN,SH_NR_RT_SIGRETURN): New symbols for sigreturn + syscall codes. + (sh_linux_sigreturn_tramp_frame): New tramp_frame definition. + (sh_linux_rt_sigreturn_tramp_frame): Likewise. + (sh_linux_init_abi): Add init calls to register new tramp_frame + definitions under 32-bit SH, update comments. + 2012-05-07 Pedro Alves <palves@redhat.com> PR gdb/10952 diff --git a/gdb/sh-linux-tdep.c b/gdb/sh-linux-tdep.c index 5bf15e3..f4445c3 100644 --- a/gdb/sh-linux-tdep.c +++ b/gdb/sh-linux-tdep.c @@ -23,6 +23,9 @@ #include "solib-svr4.h" #include "symtab.h" +#include "trad-frame.h" +#include "tramp-frame.h" + #include "glibc-tdep.h" #include "sh-tdep.h" #include "linux-tdep.h" @@ -70,6 +73,113 @@ static const struct sh_corefile_regmap fpregs_table[] = {-1 /* Terminator. */, 0} }; +/* SH signal handler frame support. */ + +static void +sh_linux_sigtramp_cache (struct frame_info *this_frame, + struct trad_frame_cache *this_cache, + CORE_ADDR func, int regs_offset) +{ + int i; + struct gdbarch *gdbarch = get_frame_arch (this_frame); + CORE_ADDR base = get_frame_register_unsigned (this_frame, + gdbarch_sp_regnum (gdbarch)); + CORE_ADDR regs = base + regs_offset; + + for (i = 0; i < 18; i++) + trad_frame_set_reg_addr (this_cache, i, regs + i * 4); + + trad_frame_set_reg_addr (this_cache, SR_REGNUM, regs + 18 * 4); + trad_frame_set_reg_addr (this_cache, GBR_REGNUM, regs + 19 * 4); + trad_frame_set_reg_addr (this_cache, MACH_REGNUM, regs + 20 * 4); + trad_frame_set_reg_addr (this_cache, MACL_REGNUM, regs + 21 * 4); + + /* Restore FP state if we have an FPU. */ + if (gdbarch_fp0_regnum (gdbarch) != -1) + { + CORE_ADDR fpregs = regs + 22 * 4; + for (i = FR0_REGNUM; i <= FP_LAST_REGNUM; i++) + trad_frame_set_reg_addr (this_cache, i, fpregs + i * 4); + trad_frame_set_reg_addr (this_cache, FPSCR_REGNUM, fpregs + 32 * 4); + trad_frame_set_reg_addr (this_cache, FPUL_REGNUM, fpregs + 33 * 4); + } + + /* Save a frame ID. */ + trad_frame_set_id (this_cache, frame_id_build (base, func)); +} + +/* Implement struct tramp_frame "init" callbacks for signal + trampolines on 32-bit SH. */ + +static void +sh_linux_sigreturn_init (const struct tramp_frame *self, + struct frame_info *this_frame, + struct trad_frame_cache *this_cache, + CORE_ADDR func) +{ + /* SH 32-bit sigframe: sigcontext at start of sigframe, + registers start after a single 'oldmask' word. */ + sh_linux_sigtramp_cache (this_frame, this_cache, func, 4); +} + +static void +sh_linux_rt_sigreturn_init (const struct tramp_frame *self, + struct frame_info *this_frame, + struct trad_frame_cache *this_cache, + CORE_ADDR func) +{ + /* SH 32-bit rt_sigframe: starts with a siginfo (128 bytes), then + we can find sigcontext embedded within a ucontext (offset 20 bytes). + Then registers start after a single 'oldmask' word. */ + sh_linux_sigtramp_cache (this_frame, this_cache, func, + 128 /* sizeof (struct siginfo) */ + + 20 /* offsetof (struct ucontext, uc_mcontext) */ + + 4 /* oldmask word at start of sigcontext */); +} + +/* Instruction patterns. */ +#define SH_MOVW 0x9305 +#define SH_TRAP 0xc300 +#define SH_OR_R0_R0 0x200b + +/* SH sigreturn syscall numbers. */ +#define SH_NR_SIGRETURN 0x0077 +#define SH_NR_RT_SIGRETURN 0x00ad + +static struct tramp_frame sh_linux_sigreturn_tramp_frame = { + SIGTRAMP_FRAME, + 2, + { + { SH_MOVW, 0xffff }, + { SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */ + { SH_OR_R0_R0, 0xffff }, + { SH_OR_R0_R0, 0xffff }, + { SH_OR_R0_R0, 0xffff }, + { SH_OR_R0_R0, 0xffff }, + { SH_OR_R0_R0, 0xffff }, + { SH_NR_SIGRETURN, 0xffff }, + { TRAMP_SENTINEL_INSN } + }, + sh_linux_sigreturn_init +}; + +static struct tramp_frame sh_linux_rt_sigreturn_tramp_frame = { + SIGTRAMP_FRAME, + 2, + { + { SH_MOVW, 0xffff }, + { SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */ + { SH_OR_R0_R0, 0xffff }, + { SH_OR_R0_R0, 0xffff }, + { SH_OR_R0_R0, 0xffff }, + { SH_OR_R0_R0, 0xffff }, + { SH_OR_R0_R0, 0xffff }, + { SH_NR_RT_SIGRETURN, 0xffff }, + { TRAMP_SENTINEL_INSN } + }, + sh_linux_rt_sigreturn_init +}; + static void sh_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { @@ -84,13 +194,17 @@ sh_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) set_gdbarch_fetch_tls_load_module_address (gdbarch, svr4_fetch_objfile_link_map); - /* Core files are supported for 32-bit SH only, at present. */ + /* Core files and signal handler frame unwinding are supported for + 32-bit SH only, at present. */ if (info.bfd_arch_info->mach != bfd_mach_sh5) { struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); tdep->core_gregmap = (struct sh_corefile_regmap *)gregs_table; tdep->core_fpregmap = (struct sh_corefile_regmap *)fpregs_table; + + tramp_frame_prepend_unwinder (gdbarch, &sh_linux_sigreturn_tramp_frame); + tramp_frame_prepend_unwinder (gdbarch, &sh_linux_rt_sigreturn_tramp_frame); } } |