我遇到了以下问题：我的软件导致了死锁，我对它的起源的唯一线索是一个原始堆栈跟踪，我的芯片组只为这种情况提供了 8 个级别。
但是，我的堆栈跟踪类似于：
memset
memset
memset
memset
memset
memset
memset
memset
我想删除 memset 以查看是哪个函数导致了这种混乱。如果我要求 gcc 内联 memset，它会抱怨说我没有它的函数体。
那么，有没有办法内联 memset 呢？有没有人对调试这个问题有任何其他想法？
编辑
我已经尝试使用for将 memset 替换为愚蠢的实现，但这使我的软件行为异常，并且出现了其他问题，使我无法陷入僵局。
编辑
顺便说一句，我正在使用 MIPS 拱门。我不是 MIPS 汇编专家，所以我做了一个愚蠢的尝试来获取 memset 的反汇编代码并插入 C 函数的主体。我从 objdump -d 和 gdb disassemble 得到了不同的指令，所以我对它们都进行了尝试。以下是我创建的函数：
void * memset(void * str_a, int ch, size_t count) {
asm("mov #12,r0");
asm("cmp/gt r6,r0");
asm("mov r4,r0");
asm("bt.s 30 <.L_dup_bytes+0x18>");
asm("add r4,r6");
asm("tst #3,r0");
asm("bt.s 18 <.L_dup_bytes>");
asm("extu.b r5,r5");
asm("mov.b r5,@r0");
asm("add #1,r0");
asm("tst #3,r0");
asm("bf 10 <_memset+0x10>");
}
void * memset(void * str_a, int ch, size_t count) {
asm("mov #12,r0");
asm("cmp/gt r6,r0");
asm("mov r4,r0");
asm("bt.s 0x8163682c <memset+48>");
asm("add r4,r6");
asm("tst #3,r0");
asm("bt.s 0x81636814 <memset+24>");
asm("extu.b r5,r5");
asm("mov.b r5,@r0");
asm("add #1,r0");
asm("tst #3,r0");
asm("bf 0x8163680c <memset+16>");
asm("swap.b r5,r2");
asm("or r2,r5");
asm("swap.w r5,r2");
asm("or r2,r5");
asm("add #-16,r6");
asm("nop ");
asm("mov.l r5,@r0");
asm("cmp/hs r6,r0");
asm("mov.l r5,@(4,r0)");
asm("bf.s 0x81636820 <memset+36>");
asm("add #8,r0");
asm("add #16,r6");
asm("cmp/eq r6,r0");
asm("bt 0x81636838 <memset+60>");
asm("mov.b r5,@r0");
asm("add #1,r0");
asm("cmp/eq r6,r0");
asm("bf 0x81636830 <memset+52>");
asm("rts ");
asm("mov r4,r0");
}
这给了我以下错误：
第一个内存集：
/tmp/ccAuFFap.s: Assembler messages:
/tmp/ccAuFFap.s:3457: Warning: missing operand; zero assumed
/tmp/ccAuFFap.s:3469: Warning: missing operand; zero assumed
/tmp/ccAuFFap.s:3489: Warning: missing operand; zero assumed
/tmp/ccAuFFap.s:3457: Error: displacement to defined symbol .L0 overflows 8-bit field
/tmp/ccAuFFap.s:3469: Error: displacement to undefined symbol .L0 overflows 8-bit field
/tmp/ccAuFFap.s:3489: Error: displacement to defined symbol .L0 overflows 8-bit field
第二个内存集：
/tmp/cctCDgi5.s: Assembler messages:
/tmp/cctCDgi5.s:3457: Warning: missing operand; zero assumed
/tmp/cctCDgi5.s:3469: Warning: missing operand; zero assumed
/tmp/cctCDgi5.s:3489: Warning: missing operand; zero assumed
/tmp/cctCDgi5.s:3529: Warning: missing operand; zero assumed
/tmp/cctCDgi5.s:3545: Warning: missing operand; zero assumed
/tmp/cctCDgi5.s:3561: Warning: missing operand; zero assumed
/tmp/cctCDgi5.s:3457: Error: displacement to defined symbol .L0 overflows 8-bit field
/tmp/cctCDgi5.s:3469: Error: displacement to defined symbol .L0 overflows 8-bit field
/tmp/cctCDgi5.s:3489: Error: displacement to defined symbol .L0 overflows 8-bit field
/tmp/cctCDgi5.s:3529: Error: displacement to defined symbol .L0 overflows 8-bit field
/tmp/cctCDgi5.s:3545: Error: displacement to defined symbol .L0 overflows 8-bit field
/tmp/cctCDgi5.s:3561: Error: displacement to defined symbol .L0 overflows 8-bit field
有人可以帮助解决这些错误吗？
编辑
使用以下源代码尝试了另一个版本：
void * memset(void * str_a, int ch, size_t count) {
asm("slti t1, a2, 8 ");
asm("bne t1, zero, L(last8)");
asm("move v0, a0 ");
asm("beq a1, zero, L(ueven) ");
asm("andi a1, 0xff ");
asm("sll t0, a1, 8");
asm("or a1, t0");
asm("sll t0, a1, 16");
asm("or a1, t0 ");
asm("L(ueven): ");
asm("subu t0, zero, a0 ");
asm("andi t0, 0x3");
asm("beq t0, zero, L(chkw)");
asm("subu a2, t0");
asm("SWHI a1, 0(a0) ");
asm("addu a0, t0 ");
asm("L(chkw): ");
asm("andi t0, a2, 0x7 ");
asm("beq t0, a2, L(chkl)");
asm("subu a3, a2, t0");
asm("addu a3, a0 ");
asm("move a2, t0 ");
asm("L(loopw): ");
asm("addiu a0, 8 ");
asm("sw a1, -8(a0)");
asm("bne a0, a3, L(loopw)");
asm("sw a1, -4(a0)");
asm("L(chkl): ");
asm("andi t0, a2, 0x4 ");
asm("beq t0, zero, L(last8) ");
asm("subu a2, t0");
asm("sw a1, 0(a0) ");
asm("addiu a0, 4");
asm("L(last8): ");
asm("blez a2, L(exit) ");
asm("addu a3, a2, a0 ");
asm("L(lst8l): ");
asm("addiu a0, 1");
asm("bne a0, a3, L(lst8l)");
asm("sb a1, -1(a0)");
asm("L(exit): ");
asm("j ra ");
asm("nop");
}
这次的错误如下：
/tmp/ccuyfGW5.s: Assembler messages:
/tmp/ccuyfGW5.s:5131: Error: unknown opcode
/tmp/ccuyfGW5.s:5135: Error: unknown opcode
/tmp/ccuyfGW5.s:5139: Error: unknown opcode
/tmp/ccuyfGW5.s:5143: Error: unknown opcode
/tmp/ccuyfGW5.s:5147: Error: unknown opcode
/tmp/ccuyfGW5.s:5151: Error: unknown opcode
/tmp/ccuyfGW5.s:5155: Error: invalid operands for opcode
/tmp/ccuyfGW5.s:5159: Error: unknown opcode
/tmp/ccuyfGW5.s:5163: Error: invalid operands for opcode
/tmp/ccuyfGW5.s:5167: Error: unknown opcode
/tmp/ccuyfGW5.s:5171: Error: unknown opcode
/tmp/ccuyfGW5.s:5175: Error: unknown opcode
/tmp/ccuyfGW5.s:5179: Error: unknown opcode
/tmp/ccuyfGW5.s:5183: Error: unknown opcode
/tmp/ccuyfGW5.s:5187: Error: unknown opcode
/tmp/ccuyfGW5.s:5191: Error: unknown opcode
/tmp/ccuyfGW5.s:5195: Error: unknown opcode
/tmp/ccuyfGW5.s:5199: Error: unknown opcode
/tmp/ccuyfGW5.s:5203: Error: unknown opcode
/tmp/ccuyfGW5.s:5207: Error: unknown opcode
/tmp/ccuyfGW5.s:5211: Error: unknown opcode
/tmp/ccuyfGW5.s:5215: Error: unknown opcode
/tmp/ccuyfGW5.s:5219: Error: unknown opcode
/tmp/ccuyfGW5.s:5223: Error: unknown opcode
/tmp/ccuyfGW5.s:5227: Error: unknown opcode
/tmp/ccuyfGW5.s:5231: Error: unknown opcode
/tmp/ccuyfGW5.s:5235: Error: unknown opcode
/tmp/ccuyfGW5.s:5239: Error: unknown opcode
/tmp/ccuyfGW5.s:5243: Error: unknown opcode
/tmp/ccuyfGW5.s:5247: Error: unknown opcode
/tmp/ccuyfGW5.s:5251: Error: unknown opcode
/tmp/ccuyfGW5.s:5255: Error: unknown opcode
/tmp/ccuyfGW5.s:5259: Error: unknown opcode
/tmp/ccuyfGW5.s:5263: Error: unknown opcode
/tmp/ccuyfGW5.s:5267: Error: unknown opcode
/tmp/ccuyfGW5.s:5271: Error: unknown opcode
/tmp/ccuyfGW5.s:5275: Error: unknown opcode
/tmp/ccuyfGW5.s:5279: Error: unknown opcode
/tmp/ccuyfGW5.s:5283: Error: unknown opcode
/tmp/ccuyfGW5.s:5287: Error: unknown opcode
/tmp/ccuyfGW5.s:5291: Error: unknown opcode
/tmp/ccuyfGW5.s:5295: Error: unknown opcode
编辑
这个问题确实与堆栈损坏有关，但我会在这里提出这个问题，看看是否有人知道如何从子例程中获取反汇编代码并将其放回 C 函数体进行内联的答案。