From 386c036baa78260724d16fb2672450b09b684dcb Mon Sep 17 00:00:00 2001 From: Mark Kettenis Date: Sat, 3 Jan 2004 10:08:45 +0000 Subject: * Makefile.in (ALLDEPFILES): Remove sparc-linux-nat.c and sparcl-tdep.c. Add sparc-linux-tdep.c, sparc-sol2-nat.c, sparc-sol2-tdep.c, sparc-sol2-nat.c, sparc-sol2-tdep.c, sparc64-linux-nat.c, sparc64-linux-tdep.c, sparc64-nat.c, sparc64-sol2-tdep.c, sparc64-tdep.c, sparc64fbsd-nat.c, sparc64fbsd-tdep.c, sparcnbsd-nat.c, sparcnbsd-tdep.c. (sparc_nat_h): New variable. (sparcbsd_nat_h, sparcnbsd_tdep_h): Remove variables. (tm-sun4os4.h): Remove dependency. (sparcbsd-nat.o, sparc-linux-nat.o): Remove dependencies. (sparc64fbsd-nat.o, sparc64fbsd-tdep.o, sparc64nbsd-nat.o, sparc64-tdep.o, sparc-nat.o, sparcnbsd-nat.o, sparcnbsd-tdep.o, sparc-tdep.o): Update dependencies. (sparc-linux-tdep.o, sparc-sol2-nat.o, sparc-sol2-tdep.o, sparc64-linux-nat.o, sparc64-linux-tdep.o, sparc64-nat.o, sparc64-sol2-tdep.o, sparc64-tdep.o, sparc64nbsd-tdep.o): New dependencies. * configure.host: Remove existing sparc-*-lynxos*, sparc-*-solaris*, sparc-*-sunos4*, sparc-*-sunos5*, sparc-*-*, ultrasparc-*-freebsd, sparcv9-*-freebsd, sparc64-*-linux*, sparcv9-*-* and sparc64-*-* triplets. Add new sparc64-*-linux*, sparc-*-solaris2*, sparcv9-*-solaris2* and sparc64-*-solaris2* triplets. * configure.tgt: Remove exitsing sparc-*-aout*, sparc-*-coff*, sparc-*-elf*, sparc*-lynxos*, sparc-*-solars2*, sparc-*-sunos4*, sparc-*-sunos5*, sparc-*-vxworks*, sparc64-*linux*, sparc64-*-*, sparcv9-*-* and commented out sparc64-*-solars2* triplets. Add new sparc-*-solaris2.[0-6], sparc-*-solaris2.[0-6].*, sparc64-*-linux, sparc-*-solaris2*, sparcv9-*-solaris*, sparc64-*-solaris2* and sparc64-*-* triplets. * sparc64-tdep.c: Update copyright year. Include "inferior.h", "symtab.h" and "objfiles.h". (BIAS): Remove define. (X_OP, X_RD, X_A, X_COND, X_OP2, X_IMM22, X_OP3, X_I, X_DISP22) (X_DISP19): Remove macros. (sparc_fetch_instruction): Remove function. (struct gdbarch_tdep): Remove definition. (SPARC64_NUM_REGS, SPARC64_NUM_PSEUDO_REGS): Use ARRAY_SIZE. (sparc_breakpoint_from_pc): Remove function. (struct sparc64_frame_cache): Remove definition. (sparc64_alloc_frame_cache, sparc64_analyze_prologue, sparc64_unwind_pc): Remove functions. (sparc64_skip_prologue): Use `struct sparc_frame_cache' instead of `struct sparc64_frame_cache. Call sparc_analyze_prologue instead of sparc64_analyze_prologue. Mark constant as ULL instead of UL. (sparc64_frame_cache): Change return type to `struct sparc_frame_cache *'. Simply call sparc_frame_cache. (sparc64_frame_this_id, sparc64_frame_prev_register, sparc64_frame_base_address): Use `struct sparc_frame_cache' instead of `struct sparc64_frame_cache. (sparc_unwind_dummy_id, sparc_extract_struct_value_address, sparc_analyze_control_transfer, sparc_software_single_step, sparc64_gdbarch_init, sparc_supply_rwindow, sparc_fill_rwindow, _initialize_sparc64_tdep): Remove functions. (TSTATE_CWP, TSTATE_ICC, TSTATE_XCC): New macros. (PSR_S, PSR_ICC, PSR_VERS, PSR_IMPL, PSR_V8PLUS, PSR_XCC): New macros. (sparc64_supply_gregset, sparc64_collect_gregset, sparc64_supply_fpregset, sparc64_collect_fpregset): New functions. (sparc64_init_abi): New function. * sparc64-tdep.h: Update copyright year. Fix typo in multiple inclusion guard. Include "sparc-tdep.h". (BIAS): Define. (r_tstate_offset, r_fprs_offset): New defines. (enum sparc_regnum): Remove defenition. (enum sparc64_regnum): Reformat. (sparc_supply_rwindow, sparc_fill_rwindow): Remove prototypes. (sparc64_init_abi, sparc64_supply_gregset, sparc64_collect_gregset, sparc64_supply_fpregset, sparc64_collect_fpregset): New prototypes. (sparc64_sol2_gregset, sparc64nbsd_gregset, sparc64fbsd_gregset): Add extern declarations. (sparc64_sol2_init_abi): New prototype. (sparc64fbsd_supply_reg, sparc64fbsd_fill_reg) (sparc64fbsd_supply_fpreg, sparc64fbsd_fill_fpreg): Remove prototypes. * sparc64fbsd-nat.c: Include "sparc-nat.h", don't include "sparnbsd-nat.h". (sparc64fbsd_reg_supplies_p, sparc64fbsd_fpreg_supplies_p): Remove functions. (_initialize_sparc64fbsd_nat): Remove initialization of sparcbsd_supply_reg, sparcbsd_fill_reg, sparcbsd_supply_fpreg, sparcbsd_fill_fpreg, sparcbsd_reg_supplies_p, sparcbsd_fpreg_supplies_p. Initialize sparc_gregset. * sparc64fbsd-tdep.c: Update copyright year. Include "frame.h", "frame-unwind.h", "trad-frame.h" and "gdb_assert.h". (sparc64fbsd_r_global_offset, sparc64fbsd_r_out_offset) (sparc64fbsd_r_fprs_offset, sparc64fbsd_r_tnpc_offset) (sparc64fbsd_r_tpc_offset, sparc64fbsd_r_tstate_offset) (sparc64fbsd_r_y_offset): Remove variables. (sparc64fbsd_sizeof_struct_reg, sparc64fbsd_sizeof_struct_fpreg): Make static and const. (sparc64fbsd_supply_reg, sparc64fbsd_fill_reg) (sparc64fbsd_supply_fpreg, sparc64fbsd_fill_fpreg): Remove functions. (sparc64fbsd_gregset): New variable. (fetch_core_registers): Replace calls to sparc64fbsd_supply_reg and sparc64fbsd_supply_fpreg with calls to sparc64_supply_gregset and sparc64_supply_fpregset. (sparc64fbsd_pc_in_sigtramp, sparc64fbsd_sigtramp_frame_cache) (sparc64fbsd_sigtramp_frame_this_id) (sparc64fbsd_sigtramp_frame_prev_register): New functions. (sparc64fbsd_sigtramp_frame_unwind): New variable. (sparc64fbsd_sigtramp_frame_sniffer): New function. (sparc64fbsd_init_abi): Set pc_in_sigtramp, append sparc64fbsd_sigtramp_frame_sniffer. Call sparc64_init_abi. * sparcnbsd-tdep.c: Update copyright year. Include "floatformat.h", "frame.h", "frame-unwind.h", "symtab.h", "trad-frame.h" and "gdb_assert.h", don't include "target.h", "value.h" and "sparcnbsd-tdep.h". (REG32_OFFSET_PSR, REG32_OFFSET_PC, REG32_OFFSET_NPC) (REG32_OFFSET_Y, REG32_OFFSET_GLOBAL, REG32_OFFSET_OUT) (REG64_OFFSET_TSTATE, REG64_OFFSET_PC, REG64_OFFSET_NPC) (REG64_OFFSET_Y, REG64_OFFSET_GLOBAL, REG64_OFFSET_OUT): Remove defines. (sparcnbsd_gregset): New variable. (sparcnbsd_supply_reg32, sparcnbsd_supply_reg64) (sparcnbsd_fill_reg32, sparcnbsd_fill_reg64) (sparcnbsd_supply_fpreg32, sparcnbsd_supply_fpreg64) (sparcnbsd_fill_reg32, sparcnbsd_fill_reg64): Remove functions. (sparc32nbsd_sigtramp_start, sparc32nbsd_sigtramp_end): New variables. (sparc32nbsd_pc_in_sigtramp, sparc32nbsd_sigcontext_frame_cache) (sparc32nbsd_sigcontext_frame_this_id) (sparc32nbsd_sigcontext_frame_prev_register): New functions. (sparc32nbsd_sigcontext_frame_unwind): New variable. (sparc32nbsd_sigtramp_frame_sniffer): New function. (sparcnbsd_get_longjmp_target_32, sparcnbsd_get_longjmp_target_64): Remove functions. (sparcnbsd_aout_in_solib_call_trampoline): Rewrite. (sparcnbsd_init_abi_common, sparcnbsd_init_aout, sparcnbsd_init_elf): Remove. (sparcnbsd_init_abi, sparcnbsd_aout_init_abi) (sparcnbsd_elf_init_abi): New functions. (_initialize_sparcnbsd_tdep): New prototype. (_initialize_sparnbsd_tdep): Update. * config/sparc/fbsd.mh (NATDEPFILES): Remove sparcbsd-nat.o and corelow.o. Add sparc64-nat.o and sparc-nat.o. * config/sparc/fbsd.mt (TDEPFILES): Add sparc-tdep.o and corelow.o. * config/sparc/linux.mh: Update comment. (XM_FILE, HOST_IPC): Remove variables. (NATDEPFILES): Add sparc-sol2-nat.o and core-regset.o. Remove sparc-linux-nat.o. * config/sparc/linux.mt: Update comment. (TDEPFILES): Add sparc-sol2-tdep.o and sparc-linux-tdep.o. * config/sparc/nbsd.mt: Reformat. * config/sparc/nbsd64.mh: Update comment. (NATDEPFILES): Add sparc-nat.o. * config/sparc/nbsd64.mt: Update comment. (TDEPFILES): Add sparc64-tdep.o and sparc64nbsd-tdep.o. (TM_FILE): Set to tm-nbsd.h. * config/sparc/nbsdelf.mh: Update comment. (NATDEPFILES): Add sparc-nat.o. (XM_FILE): Delete. * config/sparc/nbsdaout.mh: Update comment. (NATDEPFILES): Add sparc-nat.o (XM_FILE): Delete. * config/sparc/nm-linux.h: Update copyright year. Don't include "config/nm-svr4.h" and "solib.h". Add protection against multiple inclusion. (KERNEL_U_SIZE): Remove define. (kernel_u_size): Remove prototype. (PTRACE_ARG3_TYPE, PTRACE_XFER_TYPE): Define. * config/sparc/nm-nbsd.h: Update copyright. Don't include "regcache.h". (CHILD_PREPARE_TO_STORE): Remove define. * config/sparc/nm-nbsdaout.h: Tweak some comments. * sparc-nat.c, sparc-tdep.c, sparc-tdep.h, sparc64nbsd-nat.c, sparcnbsd-nat.c: Rewrite files. * config/sparc/tm-linux.h, config/sparc/tm-nbsd.h: Rewrite files. * sparc-linux-nat.c, sparcbsd-nat.c, sparcbsd-nat.h, sparcnbsd-tdep.h: Remove files. * config/sparc/nm-sparclynx.h, config/sparc/nm-sun4os4.h, config/sparc/nm-sun4sol2.h, config/sparc/sp64.mt, config/sparc/sp64linux.mt, config/sparc/sp64sol2.mt, config/sparc/sparc-em.mt, config/sparc/sparclynx.mh, config/sparc/sparclynx.mt, config/sparc/sun4os4.mh, config/sparc/sun4os4.mt, config/sparc/sun4sol2.mh, config/sparc/sun4sol2.mt, config/sparc/tm-sp64.h, config/sparc/tm-sp64linux.h, config/sparc/tm-sparc.h, config/sparc/tm-sparclynx.h, config/sparc/tm-spc-em.h, config/sparc/tm-sun4os4.h, config/sparc/tm-sun4sol2.h, config/sparc/tm-vxsparc.h, config/sparc/vxsparc.mt, config/sparc/xm-linux.h, config/sparc/xm-sun4sol2.h: Remove files. * sparc-linux-tdep.c, sparc-nat.h, sparc-sol2-nat.c, sparc-sol2-tdep.c, sparc64-linux-nat.c, sparc64-linux-t dep.c, sparc64-nat.c, sparc64-sol2-tdep.c, sparc64nbsd-tdep.c: New files. * config/sparc/linux64.mh, config/sparc/linux64.mt, config/sparc/nm-sol2.h, config/sparc/sol2-64.mt, config/sparc/sol2.mh, config/sparc/sol2.mt, config/sparc/sparc.mt, config/sparc/sparc64.mt, config/sparc/tm-sol2.h: New files. --- gdb/sparc-linux-tdep.c | 311 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 311 insertions(+) create mode 100644 gdb/sparc-linux-tdep.c (limited to 'gdb/sparc-linux-tdep.c') diff --git a/gdb/sparc-linux-tdep.c b/gdb/sparc-linux-tdep.c new file mode 100644 index 0000000..13875af --- /dev/null +++ b/gdb/sparc-linux-tdep.c @@ -0,0 +1,311 @@ +/* Target-dependent code for GNU/Linux 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 "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 "gdb_assert.h" +#include "gdb_string.h" + +#include "sparc-tdep.h" + +/* Recognizing signal handler frames. */ + +/* 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 function returns whether the PC appears to + be within this bit of code. + + The instruction sequence for normal signals is + mov __NR_sigreturn, %g1 ! hex: 0x821020d8 + ta 0x10 ! hex: 0x91d02010 + + 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. + + It kind of sucks that we have to read memory from the process in + order to identify a signal trampoline, but there doesn't seem to be + any other way. However, sparc32_linux_pc_in_sigtramp arranges to + only call us if no function name could be identified, which should + be the case since the code is on the stack. */ + +#define LINUX32_SIGTRAMP_INSN0 0x821020d8 /* mov __NR_sigreturn, %g1 */ +#define LINUX32_SIGTRAMP_INSN1 0x91d02010 /* ta 0x10 */ + +/* The instruction sequence for RT signals is + mov __NR_rt_sigreturn, %g1 ! hex: 0x82102065 + ta {0x10,0x6d} ! hex: 0x91d02010 or 0x91d0206d + + The effect is to call the system call rt_sigreturn. The trap number + is variable based upon whether this is a 32-bit or 64-bit sparc binary. + Note that 64-bit binaries only use this RT signal return method. */ + +#define LINUX32_RT_SIGTRAMP_INSN0 0x82102065 +#define LINUX32_RT_SIGTRAMP_INSN1 0x91d02010 + +/* If PC is in a sigtramp routine consisting of the instructions INSN0 + and INSN1, return the address of the start of the routine. + Otherwise, return 0. */ + +CORE_ADDR +sparc_linux_sigtramp_start (CORE_ADDR pc, ULONGEST insn0, ULONGEST insn1) +{ + ULONGEST word0, word1; + char buf[8]; /* Two instructions. */ + + /* We only recognize a signal trampoline if PC is at the start of + one of the instructions. We optimize for finding the PC at the + start of the instruction sequence, as will be the case when the + trampoline is not the first frame on the stack. We assume that + in the case where the PC is not at the start of the instruction + sequence, there will be a few trailing readable bytes on the + stack. */ + + if (read_memory_nobpt (pc, buf, sizeof buf) != 0) + return 0; + + word0 = extract_unsigned_integer (buf, 4); + if (word0 != insn0) + { + if (word0 != insn1) + return 0; + + pc -= 4; + if (read_memory_nobpt (pc, buf, sizeof buf) != 0) + return 0; + + word0 = extract_unsigned_integer (buf, 4); + } + + word1 = extract_unsigned_integer (buf + 4, 4); + if (word0 != insn0 || word1 != insn1) + return 0; + + return pc; +} + +static CORE_ADDR +sparc32_linux_sigtramp_start (CORE_ADDR pc) +{ + return sparc_linux_sigtramp_start (pc, LINUX32_SIGTRAMP_INSN0, + LINUX32_SIGTRAMP_INSN1); +} + +static CORE_ADDR +sparc32_linux_rt_sigtramp_start (CORE_ADDR pc) +{ + return sparc_linux_sigtramp_start (pc, LINUX32_RT_SIGTRAMP_INSN0, + LINUX32_RT_SIGTRAMP_INSN1); +} + +static int +sparc32_linux_pc_in_sigtramp (CORE_ADDR pc, char *name) +{ + /* If we have NAME, we can optimize the search. The trampolines are + named __restore and __restore_rt. However, they aren't dynamically + exported from the shared C library, so the trampoline may appear to + be part of the preceding function. This should always be sigaction, + __sigaction, or __libc_sigaction (all aliases to the same function). */ + if (name == NULL || strstr (name, "sigaction") != NULL) + return (sparc32_linux_sigtramp_start (pc) != 0 + || sparc32_linux_rt_sigtramp_start (pc) != 0); + + return (strcmp ("__restore", name) == 0 + || strcmp ("__restore_rt", name) == 0); +} + +static struct sparc_frame_cache * +sparc32_linux_sigtramp_frame_cache (struct frame_info *next_frame, + void **this_cache) +{ + struct sparc_frame_cache *cache; + CORE_ADDR sigcontext_addr, addr; + int regnum; + + if (*this_cache) + return *this_cache; + + cache = sparc32_frame_cache (next_frame, this_cache); + gdb_assert (cache == *this_cache); + + /* ??? What about signal trampolines that aren't frameless? */ + regnum = SPARC_SP_REGNUM; + cache->base = frame_unwind_register_unsigned (next_frame, regnum); + + regnum = SPARC_O1_REGNUM; + sigcontext_addr = frame_unwind_register_unsigned (next_frame, regnum); + + cache->pc = frame_pc_unwind (next_frame); + addr = sparc32_linux_sigtramp_start (cache->pc); + if (addr == 0) + { + /* If this is a RT signal trampoline, adjust SIGCONTEXT_ADDR + accordingly. */ + addr = sparc32_linux_rt_sigtramp_start (cache->pc); + if (addr) + sigcontext_addr += 128; + else + addr = frame_func_unwind (next_frame); + } + cache->pc = addr; + + cache->saved_regs = trad_frame_alloc_saved_regs (next_frame); + + cache->saved_regs[SPARC32_PSR_REGNUM].addr = sigcontext_addr + 0; + cache->saved_regs[SPARC32_PC_REGNUM].addr = sigcontext_addr + 4; + cache->saved_regs[SPARC32_NPC_REGNUM].addr = sigcontext_addr + 8; + cache->saved_regs[SPARC32_Y_REGNUM].addr = sigcontext_addr + 12; + + /* Since %g0 is always zero, keep the identity encoding. */ + for (regnum = SPARC_G1_REGNUM, addr = sigcontext_addr + 20; + regnum <= SPARC_O7_REGNUM; regnum++, addr += 4) + cache->saved_regs[regnum].addr = addr; + + for (regnum = SPARC_L0_REGNUM, addr = cache->base; + regnum <= SPARC_I7_REGNUM; regnum++, addr += 4) + cache->saved_regs[regnum].addr = addr; + + return cache; +} + +static void +sparc32_linux_sigtramp_frame_this_id (struct frame_info *next_frame, + void **this_cache, + struct frame_id *this_id) +{ + struct sparc_frame_cache *cache = + sparc32_linux_sigtramp_frame_cache (next_frame, this_cache); + + (*this_id) = frame_id_build (cache->base, cache->pc); +} + +static void +sparc32_linux_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_linux_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_linux_sigtramp_frame_unwind = +{ + SIGTRAMP_FRAME, + sparc32_linux_sigtramp_frame_this_id, + sparc32_linux_sigtramp_frame_prev_register +}; + +static const struct frame_unwind * +sparc32_linux_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 (sparc32_linux_pc_in_sigtramp (pc, name)) + return &sparc32_linux_sigtramp_frame_unwind; + + return NULL; +} + + +static struct link_map_offsets * +sparc32_linux_svr4_fetch_link_map_offsets (void) +{ + static struct link_map_offsets lmo; + static struct link_map_offsets *lmp = NULL; + + if (lmp == NULL) + { + lmp = &lmo; + + /* Everything we need is in the first 8 bytes. */ + lmo.r_debug_size = 8; + lmo.r_map_offset = 4; + lmo.r_map_size = 4; + + /* Everything we need is in the first 20 bytes. */ + lmo.link_map_size = 20; + lmo.l_addr_offset = 0; + lmo.l_addr_size = 4; + lmo.l_name_offset = 4; + lmo.l_name_size = 4; + lmo.l_next_offset = 12; + lmo.l_next_size = 4; + lmo.l_prev_offset = 16; + lmo.l_prev_size = 4; + } + + return lmp; +} + +static void +sparc32_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + /* GNU/Linux is very similar to Solaris ... */ + sparc32_sol2_init_abi (info, gdbarch); + + /* ... but doesn't have kernel-assisted single-stepping support. */ + set_gdbarch_software_single_step (gdbarch, sparc_software_single_step); + + /* 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); + + set_gdbarch_pc_in_sigtramp (gdbarch, sparc32_linux_pc_in_sigtramp); + frame_unwind_append_sniffer (gdbarch, sparc32_linux_sigtramp_frame_sniffer); + + set_solib_svr4_fetch_link_map_offsets + (gdbarch, sparc32_linux_svr4_fetch_link_map_offsets); +} + +/* 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); +} -- cgit v1.1