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Diffstat (limited to 'gdb/sparc-sol2-tdep.c')
| -rw-r--r-- | gdb/sparc-sol2-tdep.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/gdb/sparc-sol2-tdep.c b/gdb/sparc-sol2-tdep.c new file mode 100644 index 00000000000..5f65b7826d1 --- /dev/null +++ b/gdb/sparc-sol2-tdep.c @@ -0,0 +1,201 @@ +/* Target-dependent code for Solaris SPARC. + + Copyright 2003 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 "frame.h" +#include "frame-unwind.h" +#include "gdbcore.h" +#include "symtab.h" +#include "objfiles.h" +#include "osabi.h" +#include "regcache.h" +#include "target.h" +#include "trad-frame.h" + +#include "gdb_assert.h" +#include "gdb_string.h" + +#include "sparc-tdep.h" + +/* From <sys/regset.h>. */ +const struct sparc_gregset sparc32_sol2_gregset = +{ + 32 * 4, /* %psr */ + 33 * 4, /* %pc */ + 34 * 4, /* %npc */ + 35 * 4, /* %y */ + 36 * 4, /* %wim */ + 37 * 4, /* %tbr */ + 1 * 4, /* %g1 */ + 16 * 4, /* %l0 */ +}; + + +/* The Solaris signal trampolines reside in libc. For normal signals, + the function `sigacthandler' is used. This signal trampoline will + call the signal handler using the System V calling convention, + where the third argument is a pointer to an instance of + `ucontext_t', which has a member `uc_mcontext' that contains the + saved registers. Incidentally, the kernel passes the `ucontext_t' + pointer as the third argument of the signal trampoline too, and + `sigacthandler' simply passes it on. However, if you link your + program with "-L/usr/ucblib -R/usr/ucblib -lucb", the function + `ucbsigvechandler' will be used, which invokes the using the BSD + convention, where the third argument is a pointer to an instance of + `struct sigcontext'. It is the `ucbsigvechandler' function that + converts the `ucontext_t' to a `sigcontext', and back. Unless the + signal handler modifies the `struct sigcontext' we can safely + ignore this. */ + +int +sparc_sol2_pc_in_sigtramp (CORE_ADDR pc, char *name) +{ + return (name && (strcmp (name, "sigacthandler") == 0 + || strcmp (name, "ucbsigvechandler") == 0)); +} + +static struct sparc_frame_cache * +sparc32_sol2_sigtramp_frame_cache (struct frame_info *next_frame, + void **this_cache) +{ + struct sparc_frame_cache *cache; + CORE_ADDR mcontext_addr, addr; + int regnum; + + if (*this_cache) + return *this_cache; + + cache = sparc_frame_cache (next_frame, this_cache); + gdb_assert (cache == *this_cache); + + cache->saved_regs = trad_frame_alloc_saved_regs (next_frame); + + /* The third argument is a pointer to an instance of `ucontext_t', + which has a member `uc_mcontext' that contains the saved + registers. */ + regnum = (cache->frameless_p ? SPARC_O2_REGNUM : SPARC_I2_REGNUM); + mcontext_addr = frame_unwind_register_unsigned (next_frame, regnum) + 40; + + cache->saved_regs[SPARC32_PSR_REGNUM].addr = mcontext_addr + 0 * 4; + cache->saved_regs[SPARC32_PC_REGNUM].addr = mcontext_addr + 1 * 4; + cache->saved_regs[SPARC32_NPC_REGNUM].addr = mcontext_addr + 2 * 4; + cache->saved_regs[SPARC32_Y_REGNUM].addr = mcontext_addr + 3 * 4; + + /* Since %g0 is always zero, keep the identity encoding. */ + for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 4 * 4; + regnum <= SPARC_O7_REGNUM; regnum++, addr += 4) + cache->saved_regs[regnum].addr = addr; + + if (get_frame_memory_unsigned (next_frame, mcontext_addr + 19 * 4, 4)) + { + /* The register windows haven't been flushed. */ + for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++) + trad_frame_set_unknown (cache->saved_regs, regnum); + } + else + { + addr = cache->saved_regs[SPARC_SP_REGNUM].addr; + addr = get_frame_memory_unsigned (next_frame, addr, 4); + for (regnum = SPARC_L0_REGNUM; + regnum <= SPARC_I7_REGNUM; regnum++, addr += 4) + cache->saved_regs[regnum].addr = addr; + } + + return cache; +} + +static void +sparc32_sol2_sigtramp_frame_this_id (struct frame_info *next_frame, + void **this_cache, + struct frame_id *this_id) +{ + struct sparc_frame_cache *cache = + sparc32_sol2_sigtramp_frame_cache (next_frame, this_cache); + + (*this_id) = frame_id_build (cache->base, cache->pc); +} + +static void +sparc32_sol2_sigtramp_frame_prev_register (struct frame_info *next_frame, + void **this_cache, + int regnum, int *optimizedp, + enum lval_type *lvalp, + CORE_ADDR *addrp, + int *realnump, void *valuep) +{ + struct sparc_frame_cache *cache = + sparc32_sol2_sigtramp_frame_cache (next_frame, this_cache); + + trad_frame_prev_register (next_frame, cache->saved_regs, regnum, + optimizedp, lvalp, addrp, realnump, valuep); +} + +static const struct frame_unwind sparc32_sol2_sigtramp_frame_unwind = +{ + SIGTRAMP_FRAME, + sparc32_sol2_sigtramp_frame_this_id, + sparc32_sol2_sigtramp_frame_prev_register +}; + +static const struct frame_unwind * +sparc32_sol2_sigtramp_frame_sniffer (struct frame_info *next_frame) +{ + CORE_ADDR pc = frame_pc_unwind (next_frame); + char *name; + + find_pc_partial_function (pc, &name, NULL, NULL); + if (sparc_sol2_pc_in_sigtramp (pc, name)) + return &sparc32_sol2_sigtramp_frame_unwind; + + return NULL; +} + + +void +sparc32_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + /* Solaris has SVR4-style shared libraries... */ + set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section); + set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); + + /* ...which means that we need some special handling when doing + prologue analysis. */ + tdep->plt_entry_size = 12; + + /* Solaris has kernel-assisted single-stepping support. */ + set_gdbarch_software_single_step (gdbarch, NULL); + + set_gdbarch_pc_in_sigtramp (gdbarch, sparc_sol2_pc_in_sigtramp); + frame_unwind_append_sniffer (gdbarch, sparc32_sol2_sigtramp_frame_sniffer); +} + + +/* Provide a prototype to silence -Wmissing-prototypes. */ +void _initialize_sparc_sol2_tdep (void); + +void +_initialize_sparc_sol2_tdep (void) +{ + gdbarch_register_osabi (bfd_arch_sparc, 0, + GDB_OSABI_SOLARIS, sparc32_sol2_init_abi); +} |