100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Macros for transitioning from the host ABI to Go ABI0.
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//
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// These save the frame pointer, so in general, functions that use
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// these should have zero frame size to suppress the automatic frame
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// pointer, though it's harmless to not do this.
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#ifdef GOOS_windows
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// REGS_HOST_TO_ABI0_STACK is the stack bytes used by
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// PUSH_REGS_HOST_TO_ABI0.
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#define REGS_HOST_TO_ABI0_STACK (28*8 + 8)
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// PUSH_REGS_HOST_TO_ABI0 prepares for transitioning from
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// the host ABI to Go ABI0 code. It saves all registers that are
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// callee-save in the host ABI and caller-save in Go ABI0 and prepares
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// for entry to Go.
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//
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// Save DI SI BP BX R12 R13 R14 R15 X6-X15 registers and the DF flag.
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// Clear the DF flag for the Go ABI.
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// MXCSR matches the Go ABI, so we don't have to set that,
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// and Go doesn't modify it, so we don't have to save it.
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#define PUSH_REGS_HOST_TO_ABI0() \
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PUSHFQ \
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CLD \
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ADJSP $(REGS_HOST_TO_ABI0_STACK - 8) \
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MOVQ DI, (0*0)(SP) \
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MOVQ SI, (1*8)(SP) \
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MOVQ BP, (2*8)(SP) \
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MOVQ BX, (3*8)(SP) \
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MOVQ R12, (4*8)(SP) \
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MOVQ R13, (5*8)(SP) \
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MOVQ R14, (6*8)(SP) \
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MOVQ R15, (7*8)(SP) \
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MOVUPS X6, (8*8)(SP) \
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MOVUPS X7, (10*8)(SP) \
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MOVUPS X8, (12*8)(SP) \
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MOVUPS X9, (14*8)(SP) \
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MOVUPS X10, (16*8)(SP) \
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MOVUPS X11, (18*8)(SP) \
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MOVUPS X12, (20*8)(SP) \
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MOVUPS X13, (22*8)(SP) \
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MOVUPS X14, (24*8)(SP) \
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MOVUPS X15, (26*8)(SP)
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#define POP_REGS_HOST_TO_ABI0() \
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MOVQ (0*0)(SP), DI \
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MOVQ (1*8)(SP), SI \
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MOVQ (2*8)(SP), BP \
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MOVQ (3*8)(SP), BX \
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MOVQ (4*8)(SP), R12 \
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MOVQ (5*8)(SP), R13 \
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MOVQ (6*8)(SP), R14 \
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MOVQ (7*8)(SP), R15 \
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MOVUPS (8*8)(SP), X6 \
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MOVUPS (10*8)(SP), X7 \
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MOVUPS (12*8)(SP), X8 \
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MOVUPS (14*8)(SP), X9 \
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MOVUPS (16*8)(SP), X10 \
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MOVUPS (18*8)(SP), X11 \
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MOVUPS (20*8)(SP), X12 \
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MOVUPS (22*8)(SP), X13 \
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MOVUPS (24*8)(SP), X14 \
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MOVUPS (26*8)(SP), X15 \
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ADJSP $-(REGS_HOST_TO_ABI0_STACK - 8) \
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POPFQ
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#else
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// SysV ABI
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#define REGS_HOST_TO_ABI0_STACK (6*8)
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// SysV MXCSR matches the Go ABI, so we don't have to set that,
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// and Go doesn't modify it, so we don't have to save it.
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// Both SysV and Go require DF to be cleared, so that's already clear.
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// The SysV and Go frame pointer conventions are compatible.
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#define PUSH_REGS_HOST_TO_ABI0() \
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ADJSP $(REGS_HOST_TO_ABI0_STACK) \
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MOVQ BP, (5*8)(SP) \
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LEAQ (5*8)(SP), BP \
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MOVQ BX, (0*8)(SP) \
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MOVQ R12, (1*8)(SP) \
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MOVQ R13, (2*8)(SP) \
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MOVQ R14, (3*8)(SP) \
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MOVQ R15, (4*8)(SP)
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#define POP_REGS_HOST_TO_ABI0() \
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MOVQ (0*8)(SP), BX \
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MOVQ (1*8)(SP), R12 \
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MOVQ (2*8)(SP), R13 \
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MOVQ (3*8)(SP), R14 \
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MOVQ (4*8)(SP), R15 \
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MOVQ (5*8)(SP), BP \
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ADJSP $-(REGS_HOST_TO_ABI0_STACK)
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#endif
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