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add comments to x86.cpp

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This commit is contained in:
Joel Dice 2011-01-28 17:15:57 -07:00
parent 08a6025138
commit cac232a84e
1 changed files with 4 additions and 3 deletions
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7
src/x86.cpp
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@ -2585,13 +2585,12 @@ nextFrame(ArchitectureContext* c UNUSED, uint8_t* start, unsigned size UNUSED,
uint8_t* instruction = static_cast<uint8_t*>(*ip); uint8_t* instruction = static_cast<uint8_t*>(*ip);
// skip stack overflow check, if present:
if (BytesPerWord == 4) { if (BytesPerWord == 4) {
if (*start == 0x39) { if (*start == 0x39) {
// skip stack overflow check
start += 11; start += 11;
} }
} else if (*start == 0x48 and start[1] == 0x39) { } else if (*start == 0x48 and start[1] == 0x39) {
// skip stack overflow check
start += 12; start += 12;
} }
@ -2611,7 +2610,7 @@ nextFrame(ArchitectureContext* c UNUSED, uint8_t* start, unsigned size UNUSED,
} }
} }
if (*instruction == 0xc3) { if (*instruction == 0xc3) { // return
*ip = reinterpret_cast<void**>(*stack)[0]; *ip = reinterpret_cast<void**>(*stack)[0];
return; return;
} }
@ -2625,6 +2624,8 @@ nextFrame(ArchitectureContext* c UNUSED, uint8_t* start, unsigned size UNUSED,
- StackAlignmentInWords; - StackAlignmentInWords;
} }
// check for post-non-tail-call stack adjustment of the form "add
// $offset,%rsp":
if (BytesPerWord == 4) { if (BytesPerWord == 4) {
if ((*instruction == 0x83 or *instruction == 0x81) if ((*instruction == 0x83 or *instruction == 0x81)
and instruction[1] == 0xec) and instruction[1] == 0xec)