f295bde84c
Currently `avo` uses `BP` as a standard general-purpose register. However, `BP` is used for the frame pointer and should be callee-save. Under some circumstances, the Go assembler will do this automatically, but not always. At the moment `avo` can produce code that clobbers the `BP` register. Since Go 1.16 this code will also fail a new `go vet` check. This PR provides a (currently sub-optimal) fix for the issue. It introduces an `EnsureBasePointerCalleeSaved` pass which will check if the base pointer is written to by a function, and if so will artificially ensure that the function has a non-zero frame size. This will trigger the Go assembler to automatically save and restore the BP register. In addition, we update the `asmdecl` tool to `asmvet`, which includes the `framepointer` vet check. Updates #156
46 lines
733 B
ArmAsm
46 lines
733 B
ArmAsm
// Code generated by command: go run asm.go -out gp8.s -stubs stub.go. DO NOT EDIT.
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#include "textflag.h"
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// func GP8() uint8
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TEXT ·GP8(SB), NOSPLIT, $8-1
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MOVB $0x01, AL
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MOVB $0x02, CL
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MOVB $0x03, DL
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MOVB $0x04, BL
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MOVB $0x05, BP
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MOVB $0x06, SI
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MOVB $0x07, DI
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MOVB $0x08, R8
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MOVB $0x09, R9
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MOVB $0x0a, R10
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MOVB $0x0b, R11
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MOVB $0x0c, R12
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MOVB $0x0d, R13
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MOVB $0x0e, R14
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MOVB $0x0f, R15
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MOVB $0x10, AH
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MOVB $0x11, CH
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MOVB $0x12, DH
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MOVB $0x13, BH
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ADDB CL, AL
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ADDB DL, AL
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ADDB BL, AL
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ADDB BP, AL
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ADDB SI, AL
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ADDB DI, AL
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ADDB R8, AL
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ADDB R9, AL
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ADDB R10, AL
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ADDB R11, AL
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ADDB R12, AL
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ADDB R13, AL
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ADDB R14, AL
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ADDB R15, AL
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ADDB AH, AL
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ADDB CH, AL
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ADDB DH, AL
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ADDB BH, AL
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MOVB AL, ret+0(FP)
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RET
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