| /* Target-dependent code for GNU/Linux SPARC. |
| |
| Copyright 2003, 2004, 2005 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "floatformat.h" |
| #include "frame.h" |
| #include "frame-unwind.h" |
| #include "gdbarch.h" |
| #include "gdbcore.h" |
| #include "osabi.h" |
| #include "regcache.h" |
| #include "solib-svr4.h" |
| #include "symtab.h" |
| #include "trad-frame.h" |
| #include "tramp-frame.h" |
| |
| #include "sparc-tdep.h" |
| |
| /* Signal trampoline support. */ |
| |
| static void sparc32_linux_sigframe_init (const struct tramp_frame *self, |
| struct frame_info *next_frame, |
| struct trad_frame_cache *this_cache, |
| CORE_ADDR func); |
| |
| /* GNU/Linux has two flavors of signals. Normal signal handlers, and |
| "realtime" (RT) signals. The RT signals can provide additional |
| information to the signal handler if the SA_SIGINFO flag is set |
| when establishing a signal handler using `sigaction'. It is not |
| unlikely that future versions of GNU/Linux will support SA_SIGINFO |
| for normal signals too. */ |
| |
| /* When the sparc Linux kernel calls a signal handler and the |
| SA_RESTORER flag isn't set, the return address points to a bit of |
| code on the stack. This code checks whether the PC appears to be |
| within this bit of code. |
| |
| The instruction sequence for normal signals is encoded below. |
| Checking for the code sequence should be somewhat reliable, because |
| the effect is to call the system call sigreturn. This is unlikely |
| to occur anywhere other than a signal trampoline. */ |
| |
| static const struct tramp_frame sparc32_linux_sigframe = |
| { |
| SIGTRAMP_FRAME, |
| 4, |
| { |
| { 0x821020d8, -1 }, /* mov __NR_sugreturn, %g1 */ |
| { 0x91d02010, -1 }, /* ta 0x10 */ |
| { TRAMP_SENTINEL_INSN, -1 } |
| }, |
| sparc32_linux_sigframe_init |
| }; |
| |
| /* The instruction sequence for RT signals is slightly different. The |
| effect is to call the system call rt_sigreturn. */ |
| |
| static const struct tramp_frame sparc32_linux_rt_sigframe = |
| { |
| SIGTRAMP_FRAME, |
| 4, |
| { |
| { 0x82102065, -1 }, /* mov __NR_rt_sigreturn, %g1 */ |
| { 0x91d02010, -1 }, /* ta 0x10 */ |
| { TRAMP_SENTINEL_INSN, -1 } |
| }, |
| sparc32_linux_sigframe_init |
| }; |
| |
| static void |
| sparc32_linux_sigframe_init (const struct tramp_frame *self, |
| struct frame_info *next_frame, |
| struct trad_frame_cache *this_cache, |
| CORE_ADDR func) |
| { |
| CORE_ADDR base, addr; |
| int regnum; |
| |
| base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM); |
| if (self == &sparc32_linux_rt_sigframe) |
| base += 128; |
| |
| /* Offsets from <bits/sigcontext.h>. */ |
| |
| trad_frame_set_reg_addr (this_cache, SPARC32_PSR_REGNUM, base + 0); |
| trad_frame_set_reg_addr (this_cache, SPARC32_PC_REGNUM, base + 4); |
| trad_frame_set_reg_addr (this_cache, SPARC32_NPC_REGNUM, base + 8); |
| trad_frame_set_reg_addr (this_cache, SPARC32_Y_REGNUM, base + 12); |
| |
| /* Since %g0 is always zero, keep the identity encoding. */ |
| addr = base + 20; |
| for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++) |
| { |
| trad_frame_set_reg_addr (this_cache, regnum, addr); |
| addr += 4; |
| } |
| |
| base = addr = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM); |
| for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++) |
| { |
| trad_frame_set_reg_addr (this_cache, regnum, addr); |
| addr += 4; |
| } |
| trad_frame_set_id (this_cache, frame_id_build (base, func)); |
| } |
| |
| |
| static void |
| sparc32_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| tramp_frame_prepend_unwinder (gdbarch, &sparc32_linux_sigframe); |
| tramp_frame_prepend_unwinder (gdbarch, &sparc32_linux_rt_sigframe); |
| |
| /* GNU/Linux has SVR4-style shared libraries... */ |
| set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
| set_solib_svr4_fetch_link_map_offsets |
| (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| |
| /* ...which means that we need some special handling when doing |
| prologue analysis. */ |
| tdep->plt_entry_size = 12; |
| |
| /* GNU/Linux doesn't support the 128-bit `long double' from the psABI. */ |
| set_gdbarch_long_double_bit (gdbarch, 64); |
| set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big); |
| |
| /* Enable TLS support. */ |
| set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| svr4_fetch_objfile_link_map); |
| } |
| |
| /* Provide a prototype to silence -Wmissing-prototypes. */ |
| extern void _initialize_sparc_linux_tdep (void); |
| |
| void |
| _initialize_sparc_linux_tdep (void) |
| { |
| gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_LINUX, |
| sparc32_linux_init_abi); |
| } |