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// Copyright 2022 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.
//go:build asan
#include "go_asm.h"
#include "textflag.h"
#define RARG0 R3
#define RARG1 R4
#define RARG2 R5
#define RARG3 R6
#define FARG R12
// Called from instrumented code.
// func runtime·doasanread(addr unsafe.Pointer, sz, sp, pc uintptr)
TEXT runtime·doasanread(SB),NOSPLIT|NOFRAME,$0-32
MOVD addr+0(FP), RARG0
MOVD sz+8(FP), RARG1
MOVD sp+16(FP), RARG2
MOVD pc+24(FP), RARG3
// void __asan_read_go(void *addr, uintptr_t sz, void *sp, void *pc);
MOVD $__asan_read_go(SB), FARG
BR asancall<>(SB)
// func runtime·doasanwrite(addr unsafe.Pointer, sz, sp, pc uintptr)
TEXT runtime·doasanwrite(SB),NOSPLIT|NOFRAME,$0-32
MOVD addr+0(FP), RARG0
MOVD sz+8(FP), RARG1
MOVD sp+16(FP), RARG2
MOVD pc+24(FP), RARG3
// void __asan_write_go(void *addr, uintptr_t sz, void *sp, void *pc);
MOVD $__asan_write_go(SB), FARG
BR asancall<>(SB)
// func runtime·asanunpoison(addr unsafe.Pointer, sz uintptr)
TEXT runtime·asanunpoison(SB),NOSPLIT|NOFRAME,$0-16
MOVD addr+0(FP), RARG0
MOVD sz+8(FP), RARG1
// void __asan_unpoison_go(void *addr, uintptr_t sz);
MOVD $__asan_unpoison_go(SB), FARG
BR asancall<>(SB)
// func runtime·asanpoison(addr unsafe.Pointer, sz uintptr)
TEXT runtime·asanpoison(SB),NOSPLIT|NOFRAME,$0-16
MOVD addr+0(FP), RARG0
MOVD sz+8(FP), RARG1
// void __asan_poison_go(void *addr, uintptr_t sz);
MOVD $__asan_poison_go(SB), FARG
BR asancall<>(SB)
// func runtime·asanregisterglobals(addr unsafe.Pointer, n uintptr)
TEXT runtime·asanregisterglobals(SB),NOSPLIT|NOFRAME,$0-16
MOVD addr+0(FP), RARG0
MOVD n+8(FP), RARG1
// void __asan_register_globals_go(void *addr, uintptr_t n);
MOVD $__asan_register_globals_go(SB), FARG
BR asancall<>(SB)
// Switches SP to g0 stack and calls (FARG). Arguments already set.
TEXT asancall<>(SB), NOSPLIT, $0-0
// LR saved in generated prologue
// Get info from the current goroutine
MOVD runtime·tls_g(SB), R10 // g offset in TLS
MOVD 0(R10), g
MOVD g_m(g), R7 // m for g
MOVD R1, R16 // callee-saved, preserved across C call
MOVD m_g0(R7), R10 // g0 for m
CMP R10, g // same g0?
BEQ call // already on g0
MOVD (g_sched+gobuf_sp)(R10), R1 // switch R1
call:
// prepare frame for C ABI
SUB $32, R1 // create frame for callee saving LR, CR, R2 etc.
RLDCR $0, R1, $~15, R1 // align SP to 16 bytes
MOVD FARG, CTR // address of function to be called
MOVD R0, 0(R1) // clear back chain pointer
BL (CTR)
MOVD $0, R0 // C code can clobber R0 set it back to 0
MOVD R16, R1 // restore R1;
MOVD runtime·tls_g(SB), R10 // find correct g
MOVD 0(R10), g
RET
// tls_g, g value for each thread in TLS
GLOBL runtime·tls_g+0(SB), TLSBSS+DUPOK, $8
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