X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fm68klinux-tdep.c;h=6da4d1514c41a94bde4186da448da74453ca92a3;hb=12ac1cf5374e06e54207ad961bcd4b721d5843b5;hp=c4ae867f177cb5fe71c70caea451a2edeee6690a;hpb=0a595803234985c4e8386306f21c2f2720d2e8c7;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/m68klinux-tdep.c b/gdb/m68klinux-tdep.c index c4ae867f17..6da4d1514c 100644 --- a/gdb/m68klinux-tdep.c +++ b/gdb/m68klinux-tdep.c @@ -1,7 +1,7 @@ /* Motorola m68k target-dependent support for GNU/Linux. - Copyright 1996, 1998, 2000, 2001, 2002 Free Software Foundation, - Inc. + Copyright (C) 1996, 1998, 2000, 2001, 2002, 2003, 2004 + Free Software Foundation, Inc. This file is part of GDB. @@ -17,15 +17,32 @@ 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. */ + Foundation, Inc., 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. */ #include "defs.h" #include "gdbcore.h" +#include "doublest.h" +#include "floatformat.h" #include "frame.h" #include "target.h" - +#include "gdb_string.h" +#include "gdbtypes.h" +#include "osabi.h" +#include "regcache.h" +#include "objfiles.h" +#include "symtab.h" +#include "m68k-tdep.h" +#include "trad-frame.h" +#include "frame-unwind.h" +#include "glibc-tdep.h" +#include "solib-svr4.h" +/* Offsets (in target ints) into jmp_buf. */ + +#define M68K_LINUX_JB_ELEMENT_SIZE 4 +#define M68K_LINUX_JB_PC 7 + /* Check whether insn1 and insn2 are parts of a signal trampoline. */ #define IS_SIGTRAMP(insn1, insn2) \ @@ -40,18 +57,18 @@ /* moveq #82,d0; notb d0; trap #0 */ \ || (insn1 == 0x70524600 && (insn2 >> 16) == 0x4e40)) -/* Return non-zero if PC points into the signal trampoline. For the sake - of m68k_linux_frame_saved_pc we also distinguish between non-RT and RT - signal trampolines. */ +/* Return non-zero if PC points into the signal trampoline. For the + sake of m68k_linux_get_sigtramp_info we also distinguish between + non-RT and RT signal trampolines. */ -int -m68k_linux_in_sigtramp (CORE_ADDR pc) +static int +m68k_linux_pc_in_sigtramp (CORE_ADDR pc, char *name) { CORE_ADDR sp; char buf[12]; unsigned long insn0, insn1, insn2; - if (read_memory_nobpt (pc - 4, buf, sizeof (buf))) + if (deprecated_read_memory_nobpt (pc - 4, buf, sizeof (buf))) return 0; insn1 = extract_unsigned_integer (buf + 4, 4); insn2 = extract_unsigned_integer (buf + 8, 4); @@ -66,8 +83,8 @@ m68k_linux_in_sigtramp (CORE_ADDR pc) if (IS_RT_SIGTRAMP (insn0, insn1)) return 2; - insn0 = (insn0 << 16) | (insn1 >> 16); - insn1 = (insn1 << 16) | (insn2 >> 16); + insn0 = ((insn0 << 16) & 0xffffffff) | (insn1 >> 16); + insn1 = ((insn1 << 16) & 0xffffffff) | (insn2 >> 16); if (IS_SIGTRAMP (insn0, insn1)) return 1; if (IS_RT_SIGTRAMP (insn0, insn1)) @@ -76,49 +93,228 @@ m68k_linux_in_sigtramp (CORE_ADDR pc) return 0; } -/* Offset to saved PC in sigcontext, from . */ -#define SIGCONTEXT_PC_OFFSET 26 +/* From . */ +static int m68k_linux_sigcontext_reg_offset[M68K_NUM_REGS] = +{ + 2 * 4, /* %d0 */ + 3 * 4, /* %d1 */ + -1, /* %d2 */ + -1, /* %d3 */ + -1, /* %d4 */ + -1, /* %d5 */ + -1, /* %d6 */ + -1, /* %d7 */ + 4 * 4, /* %a0 */ + 5 * 4, /* %a1 */ + -1, /* %a2 */ + -1, /* %a3 */ + -1, /* %a4 */ + -1, /* %a5 */ + -1, /* %fp */ + 1 * 4, /* %sp */ + 5 * 4 + 2, /* %sr */ + 6 * 4 + 2, /* %pc */ + 8 * 4, /* %fp0 */ + 11 * 4, /* %fp1 */ + -1, /* %fp2 */ + -1, /* %fp3 */ + -1, /* %fp4 */ + -1, /* %fp5 */ + -1, /* %fp6 */ + -1, /* %fp7 */ + 14 * 4, /* %fpcr */ + 15 * 4, /* %fpsr */ + 16 * 4 /* %fpiaddr */ +}; + +/* From . */ +static int m68k_linux_ucontext_reg_offset[M68K_NUM_REGS] = +{ + 6 * 4, /* %d0 */ + 7 * 4, /* %d1 */ + 8 * 4, /* %d2 */ + 9 * 4, /* %d3 */ + 10 * 4, /* %d4 */ + 11 * 4, /* %d5 */ + 12 * 4, /* %d6 */ + 13 * 4, /* %d7 */ + 14 * 4, /* %a0 */ + 15 * 4, /* %a1 */ + 16 * 4, /* %a2 */ + 17 * 4, /* %a3 */ + 18 * 4, /* %a4 */ + 19 * 4, /* %a5 */ + 20 * 4, /* %fp */ + 21 * 4, /* %sp */ + 23 * 4, /* %sr */ + 22 * 4, /* %pc */ + 27 * 4, /* %fp0 */ + 30 * 4, /* %fp1 */ + 33 * 4, /* %fp2 */ + 36 * 4, /* %fp3 */ + 39 * 4, /* %fp4 */ + 42 * 4, /* %fp5 */ + 45 * 4, /* %fp6 */ + 48 * 4, /* %fp7 */ + 24 * 4, /* %fpcr */ + 25 * 4, /* %fpsr */ + 26 * 4 /* %fpiaddr */ +}; -/* Offset to saved PC in ucontext, from . */ -#define UCONTEXT_PC_OFFSET 88 -/* Get saved user PC for sigtramp from sigcontext or ucontext. */ +/* Get info about saved registers in sigtramp. */ -static CORE_ADDR -m68k_linux_sigtramp_saved_pc (struct frame_info *frame) +struct m68k_linux_sigtramp_info { + /* Address of sigcontext. */ CORE_ADDR sigcontext_addr; - char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; - int ptrbytes = TARGET_PTR_BIT / TARGET_CHAR_BIT; - int sigcontext_offs = (2 * TARGET_INT_BIT) / TARGET_CHAR_BIT; + + /* Offset of registers in `struct sigcontext'. */ + int *sc_reg_offset; +}; + +static struct m68k_linux_sigtramp_info +m68k_linux_get_sigtramp_info (struct frame_info *next_frame) +{ + CORE_ADDR sp; + char buf[4]; + struct m68k_linux_sigtramp_info info; + + frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); + sp = extract_unsigned_integer (buf, 4); /* Get sigcontext address, it is the third parameter on the stack. */ - if (frame->next) - sigcontext_addr = read_memory_integer (FRAME_ARGS_ADDRESS (frame->next) - + FRAME_ARGS_SKIP - + sigcontext_offs, - ptrbytes); - else - sigcontext_addr = read_memory_integer (read_register (SP_REGNUM) - + sigcontext_offs, - ptrbytes); - - /* Don't cause a memory_error when accessing sigcontext in case the - stack layout has changed or the stack is corrupt. */ - if (m68k_linux_in_sigtramp (frame->pc) == 2) - target_read_memory (sigcontext_addr + UCONTEXT_PC_OFFSET, buf, ptrbytes); + info.sigcontext_addr = read_memory_unsigned_integer (sp + 8, 4); + + if (m68k_linux_pc_in_sigtramp (frame_pc_unwind (next_frame), 0) == 2) + info.sc_reg_offset = m68k_linux_ucontext_reg_offset; else - target_read_memory (sigcontext_addr + SIGCONTEXT_PC_OFFSET, buf, ptrbytes); - return extract_unsigned_integer (buf, ptrbytes); + info.sc_reg_offset = m68k_linux_sigcontext_reg_offset; + return info; } -/* Return the saved program counter for FRAME. */ +/* Signal trampolines. */ -CORE_ADDR -m68k_linux_frame_saved_pc (struct frame_info *frame) +static struct trad_frame_cache * +m68k_linux_sigtramp_frame_cache (struct frame_info *next_frame, + void **this_cache) { - if (get_frame_type (frame) == SIGTRAMP_FRAME) - return m68k_linux_sigtramp_saved_pc (frame); + struct frame_id this_id; + struct trad_frame_cache *cache; + struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); + struct m68k_linux_sigtramp_info info; + char buf[4]; + int i; + + if (*this_cache) + return *this_cache; + + cache = trad_frame_cache_zalloc (next_frame); + + /* FIXME: cagney/2004-05-01: This is is long standing broken code. + The frame ID's code address should be the start-address of the + signal trampoline and not the current PC within that + trampoline. */ + frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); + /* See the end of m68k_push_dummy_call. */ + this_id = frame_id_build (extract_unsigned_integer (buf, 4) - 4 + 8, + frame_pc_unwind (next_frame)); + trad_frame_set_id (cache, this_id); + + info = m68k_linux_get_sigtramp_info (next_frame); + + for (i = 0; i < M68K_NUM_REGS; i++) + if (info.sc_reg_offset[i] != -1) + trad_frame_set_reg_addr (cache, i, + info.sigcontext_addr + info.sc_reg_offset[i]); + + *this_cache = cache; + return cache; +} + +static void +m68k_linux_sigtramp_frame_this_id (struct frame_info *next_frame, + void **this_cache, + struct frame_id *this_id) +{ + struct trad_frame_cache *cache = + m68k_linux_sigtramp_frame_cache (next_frame, this_cache); + trad_frame_get_id (cache, this_id); +} - return read_memory_integer (frame->frame + 4, 4); +static void +m68k_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) +{ + /* Make sure we've initialized the cache. */ + struct trad_frame_cache *cache = + m68k_linux_sigtramp_frame_cache (next_frame, this_cache); + trad_frame_get_register (cache, next_frame, regnum, optimizedp, lvalp, + addrp, realnump, valuep); +} + +static const struct frame_unwind m68k_linux_sigtramp_frame_unwind = +{ + SIGTRAMP_FRAME, + m68k_linux_sigtramp_frame_this_id, + m68k_linux_sigtramp_frame_prev_register +}; + +static const struct frame_unwind * +m68k_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 (m68k_linux_pc_in_sigtramp (pc, name)) + return &m68k_linux_sigtramp_frame_unwind; + + return NULL; +} + +static void +m68k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + tdep->jb_pc = M68K_LINUX_JB_PC; + tdep->jb_elt_size = M68K_LINUX_JB_ELEMENT_SIZE; + + /* GNU/Linux uses a calling convention that's similar to SVR4. It + returns integer values in %d0/%di, pointer values in %a0 and + floating values in %fp0, just like SVR4, but uses %a1 to pass the + address to store a structure value. It also returns small + structures in registers instead of memory. */ + m68k_svr4_init_abi (info, gdbarch); + tdep->struct_value_regnum = M68K_A1_REGNUM; + tdep->struct_return = reg_struct_return; + + frame_unwind_append_sniffer (gdbarch, m68k_linux_sigtramp_frame_sniffer); + + /* Shared library handling. */ + + /* GNU/Linux uses SVR4-style shared libraries. */ + set_solib_svr4_fetch_link_map_offsets (gdbarch, + svr4_ilp32_fetch_link_map_offsets); + + /* GNU/Linux uses the dynamic linker included in the GNU C Library. */ + set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); + + set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); + + /* Enable TLS support. */ + set_gdbarch_fetch_tls_load_module_address (gdbarch, + svr4_fetch_objfile_link_map); +} + +void +_initialize_m68k_linux_tdep (void) +{ + gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_LINUX, + m68k_linux_init_abi); }