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// Copyright 2023 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Macros for transitioning from the host ABI to Go ABI // // On PPC64/ELFv2 targets, the following registers are callee // saved when called from C. They must be preserved before // calling into Go which does not preserve any of them. // // R14-R31 // CR2-4 // VR20-31 // F14-F31 // // xcoff(aix) and ELFv1 are similar, but may only require a // subset of these. // // These macros assume a 16 byte aligned stack pointer. This // is required by ELFv1, ELFv2, and AIX PPC64. #define SAVE_GPR_SIZE (18*8) #define SAVE_GPR(offset) \ MOVD R14, (offset+8*0)(R1) \ MOVD R15, (offset+8*1)(R1) \ MOVD R16, (offset+8*2)(R1) \ MOVD R17, (offset+8*3)(R1) \ MOVD R18, (offset+8*4)(R1) \ MOVD R19, (offset+8*5)(R1) \ MOVD R20, (offset+8*6)(R1) \ MOVD R21, (offset+8*7)(R1) \ MOVD R22, (offset+8*8)(R1) \ MOVD R23, (offset+8*9)(R1) \ MOVD R24, (offset+8*10)(R1) \ MOVD R25, (offset+8*11)(R1) \ MOVD R26, (offset+8*12)(R1) \ MOVD R27, (offset+8*13)(R1) \ MOVD R28, (offset+8*14)(R1) \ MOVD R29, (offset+8*15)(R1) \ MOVD g, (offset+8*16)(R1) \ MOVD R31, (offset+8*17)(R1) #define RESTORE_GPR(offset) \ MOVD (offset+8*0)(R1), R14 \ MOVD (offset+8*1)(R1), R15 \ MOVD (offset+8*2)(R1), R16 \ MOVD (offset+8*3)(R1), R17 \ MOVD (offset+8*4)(R1), R18 \ MOVD (offset+8*5)(R1), R19 \ MOVD (offset+8*6)(R1), R20 \ MOVD (offset+8*7)(R1), R21 \ MOVD (offset+8*8)(R1), R22 \ MOVD (offset+8*9)(R1), R23 \ MOVD (offset+8*10)(R1), R24 \ MOVD (offset+8*11)(R1), R25 \ MOVD (offset+8*12)(R1), R26 \ MOVD (offset+8*13)(R1), R27 \ MOVD (offset+8*14)(R1), R28 \ MOVD (offset+8*15)(R1), R29 \ MOVD (offset+8*16)(R1), g \ MOVD (offset+8*17)(R1), R31 #define SAVE_FPR_SIZE (18*8) #define SAVE_FPR(offset) \ FMOVD F14, (offset+8*0)(R1) \ FMOVD F15, (offset+8*1)(R1) \ FMOVD F16, (offset+8*2)(R1) \ FMOVD F17, (offset+8*3)(R1) \ FMOVD F18, (offset+8*4)(R1) \ FMOVD F19, (offset+8*5)(R1) \ FMOVD F20, (offset+8*6)(R1) \ FMOVD F21, (offset+8*7)(R1) \ FMOVD F22, (offset+8*8)(R1) \ FMOVD F23, (offset+8*9)(R1) \ FMOVD F24, (offset+8*10)(R1) \ FMOVD F25, (offset+8*11)(R1) \ FMOVD F26, (offset+8*12)(R1) \ FMOVD F27, (offset+8*13)(R1) \ FMOVD F28, (offset+8*14)(R1) \ FMOVD F29, (offset+8*15)(R1) \ FMOVD F30, (offset+8*16)(R1) \ FMOVD F31, (offset+8*17)(R1) #define RESTORE_FPR(offset) \ FMOVD (offset+8*0)(R1), F14 \ FMOVD (offset+8*1)(R1), F15 \ FMOVD (offset+8*2)(R1), F16 \ FMOVD (offset+8*3)(R1), F17 \ FMOVD (offset+8*4)(R1), F18 \ FMOVD (offset+8*5)(R1), F19 \ FMOVD (offset+8*6)(R1), F20 \ FMOVD (offset+8*7)(R1), F21 \ FMOVD (offset+8*8)(R1), F22 \ FMOVD (offset+8*9)(R1), F23 \ FMOVD (offset+8*10)(R1), F24 \ FMOVD (offset+8*11)(R1), F25 \ FMOVD (offset+8*12)(R1), F26 \ FMOVD (offset+8*13)(R1), F27 \ FMOVD (offset+8*14)(R1), F28 \ FMOVD (offset+8*15)(R1), F29 \ FMOVD (offset+8*16)(R1), F30 \ FMOVD (offset+8*17)(R1), F31 // Save and restore VR20-31 (aka VSR56-63). These // macros must point to a 16B aligned offset. #define SAVE_VR_SIZE (12*16) #define SAVE_VR(offset, rtmp) \ MOVD $(offset+16*0), rtmp \ STVX V20, (rtmp)(R1) \ MOVD $(offset+16*1), rtmp \ STVX V21, (rtmp)(R1) \ MOVD $(offset+16*2), rtmp \ STVX V22, (rtmp)(R1) \ MOVD $(offset+16*3), rtmp \ STVX V23, (rtmp)(R1) \ MOVD $(offset+16*4), rtmp \ STVX V24, (rtmp)(R1) \ MOVD $(offset+16*5), rtmp \ STVX V25, (rtmp)(R1) \ MOVD $(offset+16*6), rtmp \ STVX V26, (rtmp)(R1) \ MOVD $(offset+16*7), rtmp \ STVX V27, (rtmp)(R1) \ MOVD $(offset+16*8), rtmp \ STVX V28, (rtmp)(R1) \ MOVD $(offset+16*9), rtmp \ STVX V29, (rtmp)(R1) \ MOVD $(offset+16*10), rtmp \ STVX V30, (rtmp)(R1) \ MOVD $(offset+16*11), rtmp \ STVX V31, (rtmp)(R1) #define RESTORE_VR(offset, rtmp) \ MOVD $(offset+16*0), rtmp \ LVX (rtmp)(R1), V20 \ MOVD $(offset+16*1), rtmp \ LVX (rtmp)(R1), V21 \ MOVD $(offset+16*2), rtmp \ LVX (rtmp)(R1), V22 \ MOVD $(offset+16*3), rtmp \ LVX (rtmp)(R1), V23 \ MOVD $(offset+16*4), rtmp \ LVX (rtmp)(R1), V24 \ MOVD $(offset+16*5), rtmp \ LVX (rtmp)(R1), V25 \ MOVD $(offset+16*6), rtmp \ LVX (rtmp)(R1), V26 \ MOVD $(offset+16*7), rtmp \ LVX (rtmp)(R1), V27 \ MOVD $(offset+16*8), rtmp \ LVX (rtmp)(R1), V28 \ MOVD $(offset+16*9), rtmp \ LVX (rtmp)(R1), V29 \ MOVD $(offset+16*10), rtmp \ LVX (rtmp)(R1), V30 \ MOVD $(offset+16*11), rtmp \ LVX (rtmp)(R1), V31 // LR and CR are saved in the caller's frame. The callee must // make space for all other callee-save registers. #define SAVE_ALL_REG_SIZE (SAVE_GPR_SIZE+SAVE_FPR_SIZE+SAVE_VR_SIZE) // Stack a frame and save all callee-save registers following the // host OS's ABI. Fortunately, this is identical for AIX, ELFv1, and // ELFv2. All host ABIs require the stack pointer to maintain 16 byte // alignment, and save the callee-save registers in the same places. // // To restate, R1 is assumed to be aligned when this macro is used. // This assumes the caller's frame is compliant with the host ABI. // CR and LR are saved into the caller's frame per the host ABI. // R0 is initialized to $0 as expected by Go. #define STACK_AND_SAVE_HOST_TO_GO_ABI(extra) \ MOVD LR, R0 \ MOVD R0, 16(R1) \ MOVW CR, R0 \ MOVD R0, 8(R1) \ MOVDU R1, -(extra)-FIXED_FRAME-SAVE_ALL_REG_SIZE(R1) \ SAVE_GPR(extra+FIXED_FRAME) \ SAVE_FPR(extra+FIXED_FRAME+SAVE_GPR_SIZE) \ SAVE_VR(extra+FIXED_FRAME+SAVE_GPR_SIZE+SAVE_FPR_SIZE, R0) \ MOVD $0, R0 // This unstacks the frame, restoring all callee-save registers // as saved by STACK_AND_SAVE_HOST_TO_GO_ABI. // // R0 is not guaranteed to contain $0 after this macro. #define UNSTACK_AND_RESTORE_GO_TO_HOST_ABI(extra) \ RESTORE_GPR(extra+FIXED_FRAME) \ RESTORE_FPR(extra+FIXED_FRAME+SAVE_GPR_SIZE) \ RESTORE_VR(extra+FIXED_FRAME+SAVE_GPR_SIZE+SAVE_FPR_SIZE, R0) \ ADD $(extra+FIXED_FRAME+SAVE_ALL_REG_SIZE), R1 \ MOVD 16(R1), R0 \ MOVD R0, LR \ MOVD 8(R1), R0 \ MOVW R0, CR