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Help Xcode/lldb cpu thread debugging on Intel by zeroing out the clobbered base pointer

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This commit is contained in:
Aaron Culliney 2018-06-25 08:36:40 -07:00
parent 850b8f3b02
commit db8fb67944
1 changed files with 9 additions and 0 deletions
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9
src/x86/glue-prologue.h
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@ -81,6 +81,13 @@ ENTRY(func) movb off(reg_args), %al; \
popLQ _XAX;
#endif
#if __APPLE__
// Xcode/lldb gets confused if _XBP is hosed
# define _XORLQ_XBP xorLQ _XBP, _XBP;
#else
# define _XORLQ_XBP
#endif
#define GLUE_C_WRITE(func) \
ENTRY(func) pushLQ _XAX; \
pushLQ XY_Reg_X; \
@ -88,6 +95,7 @@ ENTRY(func) pushLQ _XAX; \
pushLQ reg_args; \
pushLQ PC_Reg_X; \
andLQ $0xff,_XAX; \
_XORLQ_XBP \
_PUSH_ARGS \
callLQ CALL(c_##func); \
_POP_ARGS \
@ -104,6 +112,7 @@ ENTRY(func) pushLQ XY_Reg_X; \
pushLQ reg_args; \
pushLQ PC_Reg_X; \
pushLQ _XAX; /* HACK: works around mysterious issue with generated mov(_XAX), _XAX ... */ \
_XORLQ_XBP \
pushLQ EffectiveAddr_X; /* ea is arg0 (and preserved) */ \
callLQ CALL(c_##func); \
popLQ EffectiveAddr_X; /* restore ea */ \