github.com/primecitizens/pcz/std@v0.2.1/core/stack/asm_mipsx.s (about) 1 // SPDX-License-Identifier: Apache-2.0 2 // Copyright 2023 The Prime Citizens 3 // 4 // Copyright 2016 The Go Authors. All rights reserved. 5 // Use of this source code is governed by a BSD-style 6 // license that can be found in the LICENSE file. 7 8 //go:build pcz && (mips || mipsle) 9 10 #include "textflag.h" 11 12 TEXT ·GetSP(SB),NOSPLIT,$0-4 13 MOVW R29, R0 14 ADD $8, R0 15 MOVW R0, sp+0(FP) 16 RET 17 18 TEXT ·SetSP(SB),NOSPLIT,$4-4 19 MOVW sp+0(FP), R29 20 RET 21 22 // Called during function prolog when more stack is needed. 23 // Caller has already loaded: 24 // R1: framesize, R2: argsize, R3: LR 25 // 26 // The traceback routines see morestack on a g0 as being 27 // the top of a stack (for example, morestack calling newstack 28 // calling the scheduler calling newm calling gc), so we must 29 // record an argument size. For that purpose, it has no arguments. 30 TEXT runtime·morestack(SB),NOSPLIT|NOFRAME,$0-0 31 // TODO: implement 32 UNDEF // crash 33 34 // morestack but not preserving ctxt. 35 TEXT runtime·morestack_noctxt(SB),NOSPLIT,$0-0 36 // Force SPWRITE. This function doesn't actually write SP, 37 // but it is called with a special calling convention where 38 // the caller doesn't save LR on stack but passes it as a 39 // register (R3), and the unwinder currently doesn't understand. 40 // Make it SPWRITE to stop unwinding. (See issue 54332) 41 MOVW R29, R29 42 43 MOVW R0, REGCTXT 44 JMP runtime·morestack(SB)