// Copyright 2023 The Go Authors. All rights reserved.

[0] Fix | Delete

// Use of this source code is governed by a BSD-style

[1] Fix | Delete

// license that can be found in the LICENSE file.

[2] Fix | Delete

[3] Fix | Delete

// Macros for transitioning from the host ABI to Go ABI

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//

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// On PPC64/ELFv2 targets, the following registers are callee

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// saved when called from C. They must be preserved before

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// calling into Go which does not preserve any of them.

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//

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// R14-R31

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// CR2-4

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// VR20-31

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// F14-F31

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//

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// xcoff(aix) and ELFv1 are similar, but may only require a

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// subset of these.

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//

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// These macros assume a 16 byte aligned stack pointer. This

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// is required by ELFv1, ELFv2, and AIX PPC64.

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[20] Fix | Delete

#define SAVE_GPR_SIZE (18*8)

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#define SAVE_GPR(offset) \

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MOVD R14, (offset+8*0)(R1) \

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MOVD R15, (offset+8*1)(R1) \

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MOVD R16, (offset+8*2)(R1) \

[25] Fix | Delete

MOVD R17, (offset+8*3)(R1) \

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MOVD R18, (offset+8*4)(R1) \

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MOVD R19, (offset+8*5)(R1) \

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MOVD R20, (offset+8*6)(R1) \

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MOVD R21, (offset+8*7)(R1) \

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MOVD R22, (offset+8*8)(R1) \

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MOVD R23, (offset+8*9)(R1) \

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MOVD R24, (offset+8*10)(R1) \

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MOVD R25, (offset+8*11)(R1) \

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MOVD R26, (offset+8*12)(R1) \

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MOVD R27, (offset+8*13)(R1) \

[36] Fix | Delete

MOVD R28, (offset+8*14)(R1) \

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MOVD R29, (offset+8*15)(R1) \

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MOVD g, (offset+8*16)(R1) \

[39] Fix | Delete

MOVD R31, (offset+8*17)(R1)

[40] Fix | Delete

[41] Fix | Delete

#define RESTORE_GPR(offset) \

[42] Fix | Delete

MOVD (offset+8*0)(R1), R14 \

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MOVD (offset+8*1)(R1), R15 \

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MOVD (offset+8*2)(R1), R16 \

[45] Fix | Delete

MOVD (offset+8*3)(R1), R17 \

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MOVD (offset+8*4)(R1), R18 \

[47] Fix | Delete

MOVD (offset+8*5)(R1), R19 \

[48] Fix | Delete

MOVD (offset+8*6)(R1), R20 \

[49] Fix | Delete

MOVD (offset+8*7)(R1), R21 \

[50] Fix | Delete

MOVD (offset+8*8)(R1), R22 \

[51] Fix | Delete

MOVD (offset+8*9)(R1), R23 \

[52] Fix | Delete

MOVD (offset+8*10)(R1), R24 \

[53] Fix | Delete

MOVD (offset+8*11)(R1), R25 \

[54] Fix | Delete

MOVD (offset+8*12)(R1), R26 \

[55] Fix | Delete

MOVD (offset+8*13)(R1), R27 \

[56] Fix | Delete

MOVD (offset+8*14)(R1), R28 \

[57] Fix | Delete

MOVD (offset+8*15)(R1), R29 \

[58] Fix | Delete

MOVD (offset+8*16)(R1), g \

[59] Fix | Delete

MOVD (offset+8*17)(R1), R31

[60] Fix | Delete

[61] Fix | Delete

#define SAVE_FPR_SIZE (18*8)

[62] Fix | Delete

#define SAVE_FPR(offset) \

[63] Fix | Delete

FMOVD F14, (offset+8*0)(R1) \

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FMOVD F15, (offset+8*1)(R1) \

[65] Fix | Delete

FMOVD F16, (offset+8*2)(R1) \

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FMOVD F17, (offset+8*3)(R1) \

[67] Fix | Delete

FMOVD F18, (offset+8*4)(R1) \

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FMOVD F19, (offset+8*5)(R1) \

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FMOVD F20, (offset+8*6)(R1) \

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FMOVD F21, (offset+8*7)(R1) \

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FMOVD F22, (offset+8*8)(R1) \

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FMOVD F23, (offset+8*9)(R1) \

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FMOVD F24, (offset+8*10)(R1) \

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FMOVD F25, (offset+8*11)(R1) \

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FMOVD F26, (offset+8*12)(R1) \

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FMOVD F27, (offset+8*13)(R1) \

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FMOVD F28, (offset+8*14)(R1) \

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FMOVD F29, (offset+8*15)(R1) \

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FMOVD F30, (offset+8*16)(R1) \

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FMOVD F31, (offset+8*17)(R1)

[81] Fix | Delete

[82] Fix | Delete

#define RESTORE_FPR(offset) \

[83] Fix | Delete

FMOVD (offset+8*0)(R1), F14 \

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FMOVD (offset+8*1)(R1), F15 \

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FMOVD (offset+8*2)(R1), F16 \

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FMOVD (offset+8*3)(R1), F17 \

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FMOVD (offset+8*4)(R1), F18 \

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FMOVD (offset+8*5)(R1), F19 \

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FMOVD (offset+8*6)(R1), F20 \

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FMOVD (offset+8*7)(R1), F21 \

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FMOVD (offset+8*8)(R1), F22 \

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FMOVD (offset+8*9)(R1), F23 \

[93] Fix | Delete

FMOVD (offset+8*10)(R1), F24 \

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FMOVD (offset+8*11)(R1), F25 \

[95] Fix | Delete

FMOVD (offset+8*12)(R1), F26 \

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FMOVD (offset+8*13)(R1), F27 \

[97] Fix | Delete

FMOVD (offset+8*14)(R1), F28 \

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FMOVD (offset+8*15)(R1), F29 \

[99] Fix | Delete

FMOVD (offset+8*16)(R1), F30 \

[100] Fix | Delete

FMOVD (offset+8*17)(R1), F31

[101] Fix | Delete

[102] Fix | Delete

// Save and restore VR20-31 (aka VSR56-63). These

[103] Fix | Delete

// macros must point to a 16B aligned offset.

[104] Fix | Delete

#define SAVE_VR_SIZE (12*16)

[105] Fix | Delete

#define SAVE_VR(offset, rtmp) \

[106] Fix | Delete

MOVD $(offset+16*0), rtmp \

[107] Fix | Delete

STVX V20, (rtmp)(R1) \

[108] Fix | Delete

MOVD $(offset+16*1), rtmp \

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STVX V21, (rtmp)(R1) \

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MOVD $(offset+16*2), rtmp \

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STVX V22, (rtmp)(R1) \

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MOVD $(offset+16*3), rtmp \

[113] Fix | Delete

STVX V23, (rtmp)(R1) \

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MOVD $(offset+16*4), rtmp \

[115] Fix | Delete

STVX V24, (rtmp)(R1) \

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MOVD $(offset+16*5), rtmp \

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STVX V25, (rtmp)(R1) \

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MOVD $(offset+16*6), rtmp \

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STVX V26, (rtmp)(R1) \

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MOVD $(offset+16*7), rtmp \

[121] Fix | Delete

STVX V27, (rtmp)(R1) \

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MOVD $(offset+16*8), rtmp \

[123] Fix | Delete

STVX V28, (rtmp)(R1) \

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MOVD $(offset+16*9), rtmp \

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STVX V29, (rtmp)(R1) \

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MOVD $(offset+16*10), rtmp \

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STVX V30, (rtmp)(R1) \

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MOVD $(offset+16*11), rtmp \

[129] Fix | Delete

STVX V31, (rtmp)(R1)

[130] Fix | Delete

[131] Fix | Delete

#define RESTORE_VR(offset, rtmp) \

[132] Fix | Delete

MOVD $(offset+16*0), rtmp \

[133] Fix | Delete

LVX (rtmp)(R1), V20 \

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MOVD $(offset+16*1), rtmp \

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LVX (rtmp)(R1), V21 \

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MOVD $(offset+16*2), rtmp \

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LVX (rtmp)(R1), V22 \

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MOVD $(offset+16*3), rtmp \

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LVX (rtmp)(R1), V23 \

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MOVD $(offset+16*4), rtmp \

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LVX (rtmp)(R1), V24 \

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MOVD $(offset+16*5), rtmp \

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LVX (rtmp)(R1), V25 \

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MOVD $(offset+16*6), rtmp \

[145] Fix | Delete

LVX (rtmp)(R1), V26 \

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MOVD $(offset+16*7), rtmp \

[147] Fix | Delete

LVX (rtmp)(R1), V27 \

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MOVD $(offset+16*8), rtmp \

[149] Fix | Delete

LVX (rtmp)(R1), V28 \

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MOVD $(offset+16*9), rtmp \

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LVX (rtmp)(R1), V29 \

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MOVD $(offset+16*10), rtmp \

[153] Fix | Delete

LVX (rtmp)(R1), V30 \

[154] Fix | Delete

MOVD $(offset+16*11), rtmp \

[155] Fix | Delete

LVX (rtmp)(R1), V31

[156] Fix | Delete

[157] Fix | Delete

// LR and CR are saved in the caller's frame. The callee must

[158] Fix | Delete

// make space for all other callee-save registers.

[159] Fix | Delete

#define SAVE_ALL_REG_SIZE (SAVE_GPR_SIZE+SAVE_FPR_SIZE+SAVE_VR_SIZE)

[160] Fix | Delete

[161] Fix | Delete

// Stack a frame and save all callee-save registers following the

[162] Fix | Delete

// host OS's ABI. Fortunately, this is identical for AIX, ELFv1, and

[163] Fix | Delete

// ELFv2. All host ABIs require the stack pointer to maintain 16 byte

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// alignment, and save the callee-save registers in the same places.

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//

[166] Fix | Delete

// To restate, R1 is assumed to be aligned when this macro is used.

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// This assumes the caller's frame is compliant with the host ABI.

[168] Fix | Delete

// CR and LR are saved into the caller's frame per the host ABI.

[169] Fix | Delete

// R0 is initialized to $0 as expected by Go.

[170] Fix | Delete

#define STACK_AND_SAVE_HOST_TO_GO_ABI(extra) \

[171] Fix | Delete

MOVD LR, R0 \

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MOVD R0, 16(R1) \

[173] Fix | Delete

MOVW CR, R0 \

[174] Fix | Delete

MOVD R0, 8(R1) \

[175] Fix | Delete

MOVDU R1, -(extra)-FIXED_FRAME-SAVE_ALL_REG_SIZE(R1) \

[176] Fix | Delete

SAVE_GPR(extra+FIXED_FRAME) \

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SAVE_FPR(extra+FIXED_FRAME+SAVE_GPR_SIZE) \

[178] Fix | Delete

SAVE_VR(extra+FIXED_FRAME+SAVE_GPR_SIZE+SAVE_FPR_SIZE, R0) \

[179] Fix | Delete

MOVD $0, R0

[180] Fix | Delete

[181] Fix | Delete

// This unstacks the frame, restoring all callee-save registers

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// as saved by STACK_AND_SAVE_HOST_TO_GO_ABI.

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//

[184] Fix | Delete

// R0 is not guaranteed to contain $0 after this macro.

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#define UNSTACK_AND_RESTORE_GO_TO_HOST_ABI(extra) \

[186] Fix | Delete

RESTORE_GPR(extra+FIXED_FRAME) \

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RESTORE_FPR(extra+FIXED_FRAME+SAVE_GPR_SIZE) \

[188] Fix | Delete

RESTORE_VR(extra+FIXED_FRAME+SAVE_GPR_SIZE+SAVE_FPR_SIZE, R0) \

[189] Fix | Delete

ADD $(extra+FIXED_FRAME+SAVE_ALL_REG_SIZE), R1 \

[190] Fix | Delete

MOVD 16(R1), R0 \

[191] Fix | Delete

MOVD R0, LR \

[192] Fix | Delete

MOVD 8(R1), R0 \

[193] Fix | Delete

MOVW R0, CR

[194] Fix | Delete

[195] Fix | Delete