diff options
Diffstat (limited to 'src/reflect/asm_arm64.s')
| -rw-r--r-- | src/reflect/asm_arm64.s | 61 |
1 files changed, 51 insertions, 10 deletions
diff --git a/src/reflect/asm_arm64.s b/src/reflect/asm_arm64.s index 5fe88e27e4..5b9b3573fa 100644 --- a/src/reflect/asm_arm64.s +++ b/src/reflect/asm_arm64.s @@ -5,34 +5,75 @@ #include "textflag.h" #include "funcdata.h" +// The frames of each of the two functions below contain two locals, at offsets +// that are known to the runtime. +// +// The first local is a bool called retValid with a whole pointer-word reserved +// for it on the stack. The purpose of this word is so that the runtime knows +// whether the stack-allocated return space contains valid values for stack +// scanning. +// +// The second local is an abi.RegArgs value whose offset is also known to the +// runtime, so that a stack map for it can be constructed, since it contains +// pointers visible to the GC. +#define LOCAL_RETVALID 40 +#define LOCAL_REGARGS 48 + +// The frame size of the functions below is +// 32 (args of callReflect) + 8 (bool + padding) + 392 (abi.RegArgs) = 432. + // makeFuncStub is the code half of the function returned by MakeFunc. // See the comment on the declaration of makeFuncStub in makefunc.go // for more details. // No arg size here, runtime pulls arg map out of the func value. -TEXT ·makeFuncStub(SB),(NOSPLIT|WRAPPER),$40 +TEXT ·makeFuncStub(SB),(NOSPLIT|WRAPPER),$432 NO_LOCAL_POINTERS + // NO_LOCAL_POINTERS is a lie. The stack map for the two locals in this + // frame is specially handled in the runtime. See the comment above LOCAL_RETVALID. + ADD $LOCAL_REGARGS, RSP, R20 + CALL runtime·spillArgs(SB) + MOVD R26, 32(RSP) // outside of moveMakeFuncArgPtrs's arg area + MOVD R26, 8(RSP) + MOVD R20, 16(RSP) + CALL ·moveMakeFuncArgPtrs(SB) + MOVD 32(RSP), R26 MOVD R26, 8(RSP) MOVD $argframe+0(FP), R3 MOVD R3, 16(RSP) - MOVB $0, 40(RSP) - ADD $40, RSP, R3 + MOVB $0, LOCAL_RETVALID(RSP) + ADD $LOCAL_RETVALID, RSP, R3 MOVD R3, 24(RSP) - MOVD $0, 32(RSP) - BL ·callReflect(SB) + ADD $LOCAL_REGARGS, RSP, R3 + MOVD R3, 32(RSP) + CALL ·callReflect(SB) + ADD $LOCAL_REGARGS, RSP, R20 + CALL runtime·unspillArgs(SB) RET // methodValueCall is the code half of the function returned by makeMethodValue. // See the comment on the declaration of methodValueCall in makefunc.go // for more details. // No arg size here; runtime pulls arg map out of the func value. -TEXT ·methodValueCall(SB),(NOSPLIT|WRAPPER),$40 +TEXT ·methodValueCall(SB),(NOSPLIT|WRAPPER),$432 NO_LOCAL_POINTERS + // NO_LOCAL_POINTERS is a lie. The stack map for the two locals in this + // frame is specially handled in the runtime. See the comment above LOCAL_RETVALID. + ADD $LOCAL_REGARGS, RSP, R20 + CALL runtime·spillArgs(SB) + MOVD R26, 32(RSP) // outside of moveMakeFuncArgPtrs's arg area + MOVD R26, 8(RSP) + MOVD R20, 16(RSP) + CALL ·moveMakeFuncArgPtrs(SB) + MOVD 32(RSP), R26 MOVD R26, 8(RSP) MOVD $argframe+0(FP), R3 MOVD R3, 16(RSP) - MOVB $0, 40(RSP) - ADD $40, RSP, R3 + MOVB $0, LOCAL_RETVALID(RSP) + ADD $LOCAL_RETVALID, RSP, R3 MOVD R3, 24(RSP) - MOVD $0, 32(RSP) - BL ·callMethod(SB) + ADD $LOCAL_REGARGS, RSP, R3 + MOVD R3, 32(RSP) + CALL ·callMethod(SB) + ADD $LOCAL_REGARGS, RSP, R20 + CALL runtime·unspillArgs(SB) RET |