diff options
| -rw-r--r-- | gdb/ChangeLog | 7 | ||||
| -rw-r--r-- | gdb/mips-tdep.c | 91 |
2 files changed, 98 insertions, 0 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index c8486c5..833ef75 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,10 @@ +2007-09-20 Maciej W. Rozycki <macro@mips.com> + + * mips-tdep.c (mips32_in_function_epilogue_p): New function. + (mips16_in_function_epilogue_p): Likewise. + (mips_in_function_epilogue_p): Likewise. + (mips_gdbarch_init): Register mips_in_function_epilogue_p(). + 2007-09-19 Joel Brobecker <brobecker@adacore.com> * configure.ac: Add check for "etext". diff --git a/gdb/mips-tdep.c b/gdb/mips-tdep.c index ff81651..2384e12 100644 --- a/gdb/mips-tdep.c +++ b/gdb/mips-tdep.c @@ -4404,6 +4404,95 @@ mips_skip_prologue (CORE_ADDR pc) return mips32_scan_prologue (pc, limit_pc, NULL, NULL); } +/* Check whether the PC is in a function epilogue (32-bit version). + This is a helper function for mips_in_function_epilogue_p. */ +static int +mips32_in_function_epilogue_p (CORE_ADDR pc) +{ + CORE_ADDR func_addr = 0, func_end = 0; + + if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) + { + /* The MIPS epilogue is max. 12 bytes long. */ + CORE_ADDR addr = func_end - 12; + + if (addr < func_addr + 4) + addr = func_addr + 4; + if (pc < addr) + return 0; + + for (; pc < func_end; pc += MIPS_INSN32_SIZE) + { + unsigned long high_word; + unsigned long inst; + + inst = mips_fetch_instruction (pc); + high_word = (inst >> 16) & 0xffff; + + if (high_word != 0x27bd /* addiu $sp,$sp,offset */ + && high_word != 0x67bd /* daddiu $sp,$sp,offset */ + && inst != 0x03e00008 /* jr $ra */ + && inst != 0x00000000) /* nop */ + return 0; + } + + return 1; + } + + return 0; +} + +/* Check whether the PC is in a function epilogue (16-bit version). + This is a helper function for mips_in_function_epilogue_p. */ +static int +mips16_in_function_epilogue_p (CORE_ADDR pc) +{ + CORE_ADDR func_addr = 0, func_end = 0; + + if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) + { + /* The MIPS epilogue is max. 12 bytes long. */ + CORE_ADDR addr = func_end - 12; + + if (addr < func_addr + 4) + addr = func_addr + 4; + if (pc < addr) + return 0; + + for (; pc < func_end; pc += MIPS_INSN16_SIZE) + { + unsigned short inst; + + inst = mips_fetch_instruction (pc); + + if ((inst & 0xf800) == 0xf000) /* extend */ + continue; + + if (inst != 0x6300 /* addiu $sp,offset */ + && inst != 0xfb00 /* daddiu $sp,$sp,offset */ + && inst != 0xe820 /* jr $ra */ + && inst != 0xe8a0 /* jrc $ra */ + && inst != 0x6500) /* nop */ + return 0; + } + + return 1; + } + + return 0; +} + +/* The epilogue is defined here as the area at the end of a function, + after an instruction which destroys the function's stack frame. */ +static int +mips_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) +{ + if (mips_pc_is_mips16 (pc)) + return mips16_in_function_epilogue_p (pc); + else + return mips32_in_function_epilogue_p (pc); +} + /* Root of all "set mips "/"show mips " commands. This will eventually be used for all MIPS-specific commands. */ @@ -5485,6 +5574,8 @@ mips_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) set_gdbarch_skip_prologue (gdbarch, mips_skip_prologue); + set_gdbarch_in_function_epilogue_p (gdbarch, mips_in_function_epilogue_p); + set_gdbarch_pointer_to_address (gdbarch, signed_pointer_to_address); set_gdbarch_address_to_pointer (gdbarch, address_to_signed_pointer); set_gdbarch_integer_to_address (gdbarch, mips_integer_to_address); |