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authorMaciej W. Rozycki <macro@linux-mips.org>2007-09-20 15:34:19 +0000
committerMaciej W. Rozycki <macro@linux-mips.org>2007-09-20 15:34:19 +0000
commit97ab0fdd9d053ee9201c74d4234fb68c74916548 (patch)
tree77c39e656c5ff486887416682dbd53651486a3a5 /gdb/mips-tdep.c
parent217fe99f7d382b77390e5dac91206dc64a9fcbcf (diff)
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* 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().
Diffstat (limited to 'gdb/mips-tdep.c')
-rw-r--r--gdb/mips-tdep.c91
1 files changed, 91 insertions, 0 deletions
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);