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
84 lines
1.5 KiB
ArmAsm
84 lines
1.5 KiB
ArmAsm
// Code generated by command: go run asm.go -out masks.s -stubs stub.go. DO NOT EDIT.
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#include "textflag.h"
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// func Masks() (uint16, uint64)
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TEXT ·Masks(SB), NOSPLIT, $8-16
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MOVQ $0x0001002a, AX
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MOVQ $0x0002002a, CX
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MOVQ $0x0003002a, DX
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MOVQ $0x0004002a, BX
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MOVQ $0x0005002a, BP
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MOVQ $0x0006002a, SI
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MOVQ $0x0007002a, DI
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MOVQ $0x0008002a, R8
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MOVQ $0x0009002a, R9
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MOVQ $0x000a002a, R10
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MOVQ $0x000b002a, R11
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MOVQ $0x000c002a, R12
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MOVQ $0x000d002a, R13
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MOVQ $0x000e002a, R14
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MOVQ $0x000f002a, R15
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MOVW $0x0001, AX
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MOVW $0x0002, CX
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MOVW $0x0003, DX
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MOVW $0x0004, BX
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MOVW $0x0005, BP
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MOVW $0x0006, SI
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MOVW $0x0007, DI
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MOVW $0x0008, R8
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MOVW $0x0009, R9
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MOVW $0x000a, R10
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MOVW $0x000b, R11
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MOVW $0x000c, R12
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MOVW $0x000d, R13
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MOVW $0x000e, R14
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MOVW $0x000f, R15
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ADDW CX, AX
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ADDW DX, AX
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ADDW BX, AX
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ADDW BP, AX
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ADDW SI, AX
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ADDW DI, AX
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ADDW R8, AX
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ADDW R9, AX
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ADDW R10, AX
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ADDW R11, AX
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ADDW R12, AX
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ADDW R13, AX
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ADDW R14, AX
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ADDW R15, AX
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MOVW AX, ret+0(FP)
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MOVW $0x0000, AX
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MOVW $0x0000, CX
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MOVW $0x0000, DX
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MOVW $0x0000, BX
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MOVW $0x0000, BP
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MOVW $0x0000, SI
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MOVW $0x0000, DI
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MOVW $0x0000, R8
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MOVW $0x0000, R9
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MOVW $0x0000, R10
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MOVW $0x0000, R11
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MOVW $0x0000, R12
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MOVW $0x0000, R13
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MOVW $0x0000, R14
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MOVW $0x0000, R15
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ADDQ CX, AX
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ADDQ DX, AX
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ADDQ BX, AX
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ADDQ BP, AX
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ADDQ SI, AX
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ADDQ DI, AX
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ADDQ R8, AX
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ADDQ R9, AX
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ADDQ R10, AX
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ADDQ R11, AX
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ADDQ R12, AX
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ADDQ R13, AX
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ADDQ R14, AX
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ADDQ R15, AX
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SHRQ $0x10, AX
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MOVQ AX, ret1+8(FP)
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RET
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