X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fm68klinux-tdep.c;h=a99acc9496f6fb2d75be947aae1775828790709a;hb=b2e818b70d26c7336ef4798b7beb97916ef044ac;hp=8b9193d2cc3b57826bd7d634dfc77844ab7e5920;hpb=55809acbfc09aa54b9bccba498a347df51c68f12;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/m68klinux-tdep.c b/gdb/m68klinux-tdep.c index 8b9193d2cc..a99acc9496 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, 2003 Free Software Foundation, - Inc. + Copyright (C) 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2007 + Free Software Foundation, Inc. This file is part of GDB. @@ -17,18 +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) \ @@ -43,12 +57,12 @@ /* 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]; @@ -79,124 +93,223 @@ m68k_linux_in_sigtramp (CORE_ADDR pc) return 0; } -/* Offset to saved PC in sigcontext, from . */ -#define SIGCONTEXT_PC_OFFSET 26 - -/* Offset to saved PC in ucontext, from . */ -#define UCONTEXT_PC_OFFSET 88 +/* 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 */ +}; + + +/* Get info about saved registers in sigtramp. */ + +struct m68k_linux_sigtramp_info +{ + /* Address of sigcontext. */ + CORE_ADDR sigcontext_addr; -/* Get saved user PC for sigtramp from sigcontext or ucontext. */ + /* Offset of registers in `struct sigcontext'. */ + int *sc_reg_offset; +}; -static CORE_ADDR -m68k_linux_sigtramp_saved_pc (struct frame_info *frame) +static struct m68k_linux_sigtramp_info +m68k_linux_get_sigtramp_info (struct frame_info *next_frame) { - 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; + 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 (get_next_frame (frame)) - sigcontext_addr - = read_memory_unsigned_integer (get_frame_base (get_next_frame (frame)) - + FRAME_ARGS_SKIP - + sigcontext_offs, - ptrbytes); - else - sigcontext_addr - = read_memory_unsigned_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 (get_frame_pc (frame)) == 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. */ -static 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); - - return read_memory_unsigned_integer (get_frame_base (frame) + 4, 4); + 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; } -/* The following definitions are appropriate when using the ELF - format, where floating point values are returned in fp0, pointer - values in a0 and other values in d0. */ - -/* Extract from an array REGBUF containing the (raw) register state a - function return value of type TYPE, and copy that, in virtual - format, into VALBUF. */ - static void -m68k_linux_extract_return_value (struct type *type, char *regbuf, char *valbuf) +m68k_linux_sigtramp_frame_this_id (struct frame_info *next_frame, + void **this_cache, + struct frame_id *this_id) { - if (TYPE_CODE (type) == TYPE_CODE_FLT) - { - REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM, type, - regbuf + REGISTER_BYTE (FP0_REGNUM), - valbuf); - } - else if (TYPE_CODE (type) == TYPE_CODE_PTR) - memcpy (valbuf, regbuf + REGISTER_BYTE (M68K_A0_REGNUM), - TYPE_LENGTH (type)); - else - memcpy (valbuf, - regbuf + (TYPE_LENGTH (type) >= 4 ? 0 : 4 - TYPE_LENGTH (type)), - TYPE_LENGTH (type)); + struct trad_frame_cache *cache = + m68k_linux_sigtramp_frame_cache (next_frame, this_cache); + trad_frame_get_id (cache, this_id); } -/* Write into appropriate registers a function return value of type - TYPE, given in virtual format. */ - static void -m68k_linux_store_return_value (struct type *type, char *valbuf) +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, gdb_byte *valuep) { - if (TYPE_CODE (type) == TYPE_CODE_FLT) - { - char raw_buffer[REGISTER_RAW_SIZE (FP0_REGNUM)]; - REGISTER_CONVERT_TO_RAW (type, FP0_REGNUM, valbuf, raw_buffer); - deprecated_write_register_bytes (REGISTER_BYTE (FP0_REGNUM), - raw_buffer, TYPE_LENGTH (type)); - } - else - { - if (TYPE_CODE (type) == TYPE_CODE_PTR) - deprecated_write_register_bytes (REGISTER_BYTE (M68K_A0_REGNUM), - valbuf, TYPE_LENGTH (type)); - deprecated_write_register_bytes (0, valbuf, TYPE_LENGTH (type)); - } + /* 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); } -/* Extract from an array REGBUF containing the (raw) register state - the address in which a function should return its structure value, - as a CORE_ADDR. */ +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 CORE_ADDR -m68k_linux_extract_struct_value_address (char *regbuf) +static const struct frame_unwind * +m68k_linux_sigtramp_frame_sniffer (struct frame_info *next_frame) { - return *(CORE_ADDR *) (regbuf + REGISTER_BYTE (M68K_A0_REGNUM)); + 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) { - set_gdbarch_deprecated_frame_saved_pc (gdbarch, - m68k_linux_frame_saved_pc); - set_gdbarch_deprecated_extract_return_value (gdbarch, - m68k_linux_extract_return_value); - set_gdbarch_deprecated_store_return_value (gdbarch, - m68k_linux_store_return_value); - set_gdbarch_deprecated_extract_struct_value_address (gdbarch, - m68k_linux_extract_struct_value_address); + 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/%d1, 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