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Diffstat (limited to 'src/runtime/asm_arm64.s')
| -rw-r--r-- | src/runtime/asm_arm64.s | 1598 |
1 files changed, 1598 insertions, 0 deletions
diff --git a/src/runtime/asm_arm64.s b/src/runtime/asm_arm64.s new file mode 100644 index 0000000..6d77b08 --- /dev/null +++ b/src/runtime/asm_arm64.s @@ -0,0 +1,1598 @@ +// Copyright 2015 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. + +#include "go_asm.h" +#include "go_tls.h" +#include "tls_arm64.h" +#include "funcdata.h" +#include "textflag.h" + +TEXT runtime·rt0_go(SB),NOSPLIT|TOPFRAME,$0 + // SP = stack; R0 = argc; R1 = argv + + SUB $32, RSP + MOVW R0, 8(RSP) // argc + MOVD R1, 16(RSP) // argv + +#ifdef TLS_darwin + // Initialize TLS. + MOVD ZR, g // clear g, make sure it's not junk. + SUB $32, RSP + MRS_TPIDR_R0 + AND $~7, R0 + MOVD R0, 16(RSP) // arg2: TLS base + MOVD $runtime·tls_g(SB), R2 + MOVD R2, 8(RSP) // arg1: &tlsg + BL ·tlsinit(SB) + ADD $32, RSP +#endif + + // create istack out of the given (operating system) stack. + // _cgo_init may update stackguard. + MOVD $runtime·g0(SB), g + MOVD RSP, R7 + MOVD $(-64*1024)(R7), R0 + MOVD R0, g_stackguard0(g) + MOVD R0, g_stackguard1(g) + MOVD R0, (g_stack+stack_lo)(g) + MOVD R7, (g_stack+stack_hi)(g) + + // if there is a _cgo_init, call it using the gcc ABI. + MOVD _cgo_init(SB), R12 + CBZ R12, nocgo + +#ifdef GOOS_android + MRS_TPIDR_R0 // load TLS base pointer + MOVD R0, R3 // arg 3: TLS base pointer + MOVD $runtime·tls_g(SB), R2 // arg 2: &tls_g +#else + MOVD $0, R2 // arg 2: not used when using platform's TLS +#endif + MOVD $setg_gcc<>(SB), R1 // arg 1: setg + MOVD g, R0 // arg 0: G + SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved. + BL (R12) + ADD $16, RSP + +nocgo: + BL runtime·save_g(SB) + // update stackguard after _cgo_init + MOVD (g_stack+stack_lo)(g), R0 + ADD $const_stackGuard, R0 + MOVD R0, g_stackguard0(g) + MOVD R0, g_stackguard1(g) + + // set the per-goroutine and per-mach "registers" + MOVD $runtime·m0(SB), R0 + + // save m->g0 = g0 + MOVD g, m_g0(R0) + // save m0 to g0->m + MOVD R0, g_m(g) + + BL runtime·check(SB) + +#ifdef GOOS_windows + BL runtime·wintls(SB) +#endif + + MOVW 8(RSP), R0 // copy argc + MOVW R0, -8(RSP) + MOVD 16(RSP), R0 // copy argv + MOVD R0, 0(RSP) + BL runtime·args(SB) + BL runtime·osinit(SB) + BL runtime·schedinit(SB) + + // create a new goroutine to start program + MOVD $runtime·mainPC(SB), R0 // entry + SUB $16, RSP + MOVD R0, 8(RSP) // arg + MOVD $0, 0(RSP) // dummy LR + BL runtime·newproc(SB) + ADD $16, RSP + + // start this M + BL runtime·mstart(SB) + + // Prevent dead-code elimination of debugCallV2, which is + // intended to be called by debuggers. + MOVD $runtime·debugCallV2<ABIInternal>(SB), R0 + + MOVD $0, R0 + MOVD R0, (R0) // boom + UNDEF + +DATA runtime·mainPC+0(SB)/8,$runtime·main<ABIInternal>(SB) +GLOBL runtime·mainPC(SB),RODATA,$8 + +// Windows ARM64 needs an immediate 0xf000 argument. +// See go.dev/issues/53837. +#define BREAK \ +#ifdef GOOS_windows \ + BRK $0xf000 \ +#else \ + BRK \ +#endif \ + + +TEXT runtime·breakpoint(SB),NOSPLIT|NOFRAME,$0-0 + BREAK + RET + +TEXT runtime·asminit(SB),NOSPLIT|NOFRAME,$0-0 + RET + +TEXT runtime·mstart(SB),NOSPLIT|TOPFRAME,$0 + BL runtime·mstart0(SB) + RET // not reached + +/* + * go-routine + */ + +// void gogo(Gobuf*) +// restore state from Gobuf; longjmp +TEXT runtime·gogo(SB), NOSPLIT|NOFRAME, $0-8 + MOVD buf+0(FP), R5 + MOVD gobuf_g(R5), R6 + MOVD 0(R6), R4 // make sure g != nil + B gogo<>(SB) + +TEXT gogo<>(SB), NOSPLIT|NOFRAME, $0 + MOVD R6, g + BL runtime·save_g(SB) + + MOVD gobuf_sp(R5), R0 + MOVD R0, RSP + MOVD gobuf_bp(R5), R29 + MOVD gobuf_lr(R5), LR + MOVD gobuf_ret(R5), R0 + MOVD gobuf_ctxt(R5), R26 + MOVD $0, gobuf_sp(R5) + MOVD $0, gobuf_bp(R5) + MOVD $0, gobuf_ret(R5) + MOVD $0, gobuf_lr(R5) + MOVD $0, gobuf_ctxt(R5) + CMP ZR, ZR // set condition codes for == test, needed by stack split + MOVD gobuf_pc(R5), R6 + B (R6) + +// void mcall(fn func(*g)) +// Switch to m->g0's stack, call fn(g). +// Fn must never return. It should gogo(&g->sched) +// to keep running g. +TEXT runtime·mcall<ABIInternal>(SB), NOSPLIT|NOFRAME, $0-8 + MOVD R0, R26 // context + + // Save caller state in g->sched + MOVD RSP, R0 + MOVD R0, (g_sched+gobuf_sp)(g) + MOVD R29, (g_sched+gobuf_bp)(g) + MOVD LR, (g_sched+gobuf_pc)(g) + MOVD $0, (g_sched+gobuf_lr)(g) + + // Switch to m->g0 & its stack, call fn. + MOVD g, R3 + MOVD g_m(g), R8 + MOVD m_g0(R8), g + BL runtime·save_g(SB) + CMP g, R3 + BNE 2(PC) + B runtime·badmcall(SB) + + MOVD (g_sched+gobuf_sp)(g), R0 + MOVD R0, RSP // sp = m->g0->sched.sp + MOVD (g_sched+gobuf_bp)(g), R29 + MOVD R3, R0 // arg = g + MOVD $0, -16(RSP) // dummy LR + SUB $16, RSP + MOVD 0(R26), R4 // code pointer + BL (R4) + B runtime·badmcall2(SB) + +// systemstack_switch is a dummy routine that systemstack leaves at the bottom +// of the G stack. We need to distinguish the routine that +// lives at the bottom of the G stack from the one that lives +// at the top of the system stack because the one at the top of +// the system stack terminates the stack walk (see topofstack()). +TEXT runtime·systemstack_switch(SB), NOSPLIT, $0-0 + UNDEF + BL (LR) // make sure this function is not leaf + RET + +// func systemstack(fn func()) +TEXT runtime·systemstack(SB), NOSPLIT, $0-8 + MOVD fn+0(FP), R3 // R3 = fn + MOVD R3, R26 // context + MOVD g_m(g), R4 // R4 = m + + MOVD m_gsignal(R4), R5 // R5 = gsignal + CMP g, R5 + BEQ noswitch + + MOVD m_g0(R4), R5 // R5 = g0 + CMP g, R5 + BEQ noswitch + + MOVD m_curg(R4), R6 + CMP g, R6 + BEQ switch + + // Bad: g is not gsignal, not g0, not curg. What is it? + // Hide call from linker nosplit analysis. + MOVD $runtime·badsystemstack(SB), R3 + BL (R3) + B runtime·abort(SB) + +switch: + // save our state in g->sched. Pretend to + // be systemstack_switch if the G stack is scanned. + BL gosave_systemstack_switch<>(SB) + + // switch to g0 + MOVD R5, g + BL runtime·save_g(SB) + MOVD (g_sched+gobuf_sp)(g), R3 + MOVD R3, RSP + MOVD (g_sched+gobuf_bp)(g), R29 + + // call target function + MOVD 0(R26), R3 // code pointer + BL (R3) + + // switch back to g + MOVD g_m(g), R3 + MOVD m_curg(R3), g + BL runtime·save_g(SB) + MOVD (g_sched+gobuf_sp)(g), R0 + MOVD R0, RSP + MOVD (g_sched+gobuf_bp)(g), R29 + MOVD $0, (g_sched+gobuf_sp)(g) + MOVD $0, (g_sched+gobuf_bp)(g) + RET + +noswitch: + // already on m stack, just call directly + // Using a tail call here cleans up tracebacks since we won't stop + // at an intermediate systemstack. + MOVD 0(R26), R3 // code pointer + MOVD.P 16(RSP), R30 // restore LR + SUB $8, RSP, R29 // restore FP + B (R3) + +// func switchToCrashStack0(fn func()) +TEXT runtime·switchToCrashStack0<ABIInternal>(SB), NOSPLIT, $0-8 + MOVD R0, R26 // context register + MOVD g_m(g), R1 // curm + + // set g to gcrash + MOVD $runtime·gcrash(SB), g // g = &gcrash + BL runtime·save_g(SB) // clobbers R0 + MOVD R1, g_m(g) // g.m = curm + MOVD g, m_g0(R1) // curm.g0 = g + + // switch to crashstack + MOVD (g_stack+stack_hi)(g), R1 + SUB $(4*8), R1 + MOVD R1, RSP + + // call target function + MOVD 0(R26), R0 + CALL (R0) + + // should never return + CALL runtime·abort(SB) + UNDEF + +/* + * support for morestack + */ + +// Called during function prolog when more stack is needed. +// Caller has already loaded: +// R3 prolog's LR (R30) +// +// The traceback routines see morestack on a g0 as being +// the top of a stack (for example, morestack calling newstack +// calling the scheduler calling newm calling gc), so we must +// record an argument size. For that purpose, it has no arguments. +TEXT runtime·morestack(SB),NOSPLIT|NOFRAME,$0-0 + // Cannot grow scheduler stack (m->g0). + MOVD g_m(g), R8 + MOVD m_g0(R8), R4 + + // Called from f. + // Set g->sched to context in f + MOVD RSP, R0 + MOVD R0, (g_sched+gobuf_sp)(g) + MOVD R29, (g_sched+gobuf_bp)(g) + MOVD LR, (g_sched+gobuf_pc)(g) + MOVD R3, (g_sched+gobuf_lr)(g) + MOVD R26, (g_sched+gobuf_ctxt)(g) + + CMP g, R4 + BNE 3(PC) + BL runtime·badmorestackg0(SB) + B runtime·abort(SB) + + // Cannot grow signal stack (m->gsignal). + MOVD m_gsignal(R8), R4 + CMP g, R4 + BNE 3(PC) + BL runtime·badmorestackgsignal(SB) + B runtime·abort(SB) + + // Called from f. + // Set m->morebuf to f's callers. + MOVD R3, (m_morebuf+gobuf_pc)(R8) // f's caller's PC + MOVD RSP, R0 + MOVD R0, (m_morebuf+gobuf_sp)(R8) // f's caller's RSP + MOVD g, (m_morebuf+gobuf_g)(R8) + + // Call newstack on m->g0's stack. + MOVD m_g0(R8), g + BL runtime·save_g(SB) + MOVD (g_sched+gobuf_sp)(g), R0 + MOVD R0, RSP + MOVD (g_sched+gobuf_bp)(g), R29 + MOVD.W $0, -16(RSP) // create a call frame on g0 (saved LR; keep 16-aligned) + BL runtime·newstack(SB) + + // Not reached, but make sure the return PC from the call to newstack + // is still in this function, and not the beginning of the next. + UNDEF + +TEXT runtime·morestack_noctxt(SB),NOSPLIT|NOFRAME,$0-0 + // Force SPWRITE. This function doesn't actually write SP, + // but it is called with a special calling convention where + // the caller doesn't save LR on stack but passes it as a + // register (R3), and the unwinder currently doesn't understand. + // Make it SPWRITE to stop unwinding. (See issue 54332) + MOVD RSP, RSP + + MOVW $0, R26 + B runtime·morestack(SB) + +// spillArgs stores return values from registers to a *internal/abi.RegArgs in R20. +TEXT ·spillArgs(SB),NOSPLIT,$0-0 + STP (R0, R1), (0*8)(R20) + STP (R2, R3), (2*8)(R20) + STP (R4, R5), (4*8)(R20) + STP (R6, R7), (6*8)(R20) + STP (R8, R9), (8*8)(R20) + STP (R10, R11), (10*8)(R20) + STP (R12, R13), (12*8)(R20) + STP (R14, R15), (14*8)(R20) + FSTPD (F0, F1), (16*8)(R20) + FSTPD (F2, F3), (18*8)(R20) + FSTPD (F4, F5), (20*8)(R20) + FSTPD (F6, F7), (22*8)(R20) + FSTPD (F8, F9), (24*8)(R20) + FSTPD (F10, F11), (26*8)(R20) + FSTPD (F12, F13), (28*8)(R20) + FSTPD (F14, F15), (30*8)(R20) + RET + +// unspillArgs loads args into registers from a *internal/abi.RegArgs in R20. +TEXT ·unspillArgs(SB),NOSPLIT,$0-0 + LDP (0*8)(R20), (R0, R1) + LDP (2*8)(R20), (R2, R3) + LDP (4*8)(R20), (R4, R5) + LDP (6*8)(R20), (R6, R7) + LDP (8*8)(R20), (R8, R9) + LDP (10*8)(R20), (R10, R11) + LDP (12*8)(R20), (R12, R13) + LDP (14*8)(R20), (R14, R15) + FLDPD (16*8)(R20), (F0, F1) + FLDPD (18*8)(R20), (F2, F3) + FLDPD (20*8)(R20), (F4, F5) + FLDPD (22*8)(R20), (F6, F7) + FLDPD (24*8)(R20), (F8, F9) + FLDPD (26*8)(R20), (F10, F11) + FLDPD (28*8)(R20), (F12, F13) + FLDPD (30*8)(R20), (F14, F15) + RET + +// reflectcall: call a function with the given argument list +// func call(stackArgsType *_type, f *FuncVal, stackArgs *byte, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs). +// we don't have variable-sized frames, so we use a small number +// of constant-sized-frame functions to encode a few bits of size in the pc. +// Caution: ugly multiline assembly macros in your future! + +#define DISPATCH(NAME,MAXSIZE) \ + MOVD $MAXSIZE, R27; \ + CMP R27, R16; \ + BGT 3(PC); \ + MOVD $NAME(SB), R27; \ + B (R27) +// Note: can't just "B NAME(SB)" - bad inlining results. + +TEXT ·reflectcall(SB), NOSPLIT|NOFRAME, $0-48 + MOVWU frameSize+32(FP), R16 + DISPATCH(runtime·call16, 16) + DISPATCH(runtime·call32, 32) + DISPATCH(runtime·call64, 64) + DISPATCH(runtime·call128, 128) + DISPATCH(runtime·call256, 256) + DISPATCH(runtime·call512, 512) + DISPATCH(runtime·call1024, 1024) + DISPATCH(runtime·call2048, 2048) + DISPATCH(runtime·call4096, 4096) + DISPATCH(runtime·call8192, 8192) + DISPATCH(runtime·call16384, 16384) + DISPATCH(runtime·call32768, 32768) + DISPATCH(runtime·call65536, 65536) + DISPATCH(runtime·call131072, 131072) + DISPATCH(runtime·call262144, 262144) + DISPATCH(runtime·call524288, 524288) + DISPATCH(runtime·call1048576, 1048576) + DISPATCH(runtime·call2097152, 2097152) + DISPATCH(runtime·call4194304, 4194304) + DISPATCH(runtime·call8388608, 8388608) + DISPATCH(runtime·call16777216, 16777216) + DISPATCH(runtime·call33554432, 33554432) + DISPATCH(runtime·call67108864, 67108864) + DISPATCH(runtime·call134217728, 134217728) + DISPATCH(runtime·call268435456, 268435456) + DISPATCH(runtime·call536870912, 536870912) + DISPATCH(runtime·call1073741824, 1073741824) + MOVD $runtime·badreflectcall(SB), R0 + B (R0) + +#define CALLFN(NAME,MAXSIZE) \ +TEXT NAME(SB), WRAPPER, $MAXSIZE-48; \ + NO_LOCAL_POINTERS; \ + /* copy arguments to stack */ \ + MOVD stackArgs+16(FP), R3; \ + MOVWU stackArgsSize+24(FP), R4; \ + ADD $8, RSP, R5; \ + BIC $0xf, R4, R6; \ + CBZ R6, 6(PC); \ + /* if R6=(argsize&~15) != 0 */ \ + ADD R6, R5, R6; \ + /* copy 16 bytes a time */ \ + LDP.P 16(R3), (R7, R8); \ + STP.P (R7, R8), 16(R5); \ + CMP R5, R6; \ + BNE -3(PC); \ + AND $0xf, R4, R6; \ + CBZ R6, 6(PC); \ + /* if R6=(argsize&15) != 0 */ \ + ADD R6, R5, R6; \ + /* copy 1 byte a time for the rest */ \ + MOVBU.P 1(R3), R7; \ + MOVBU.P R7, 1(R5); \ + CMP R5, R6; \ + BNE -3(PC); \ + /* set up argument registers */ \ + MOVD regArgs+40(FP), R20; \ + CALL ·unspillArgs(SB); \ + /* call function */ \ + MOVD f+8(FP), R26; \ + MOVD (R26), R20; \ + PCDATA $PCDATA_StackMapIndex, $0; \ + BL (R20); \ + /* copy return values back */ \ + MOVD regArgs+40(FP), R20; \ + CALL ·spillArgs(SB); \ + MOVD stackArgsType+0(FP), R7; \ + MOVD stackArgs+16(FP), R3; \ + MOVWU stackArgsSize+24(FP), R4; \ + MOVWU stackRetOffset+28(FP), R6; \ + ADD $8, RSP, R5; \ + ADD R6, R5; \ + ADD R6, R3; \ + SUB R6, R4; \ + BL callRet<>(SB); \ + RET + +// callRet copies return values back at the end of call*. This is a +// separate function so it can allocate stack space for the arguments +// to reflectcallmove. It does not follow the Go ABI; it expects its +// arguments in registers. +TEXT callRet<>(SB), NOSPLIT, $48-0 + NO_LOCAL_POINTERS + STP (R7, R3), 8(RSP) + STP (R5, R4), 24(RSP) + MOVD R20, 40(RSP) + BL runtime·reflectcallmove(SB) + RET + +CALLFN(·call16, 16) +CALLFN(·call32, 32) +CALLFN(·call64, 64) +CALLFN(·call128, 128) +CALLFN(·call256, 256) +CALLFN(·call512, 512) +CALLFN(·call1024, 1024) +CALLFN(·call2048, 2048) +CALLFN(·call4096, 4096) +CALLFN(·call8192, 8192) +CALLFN(·call16384, 16384) +CALLFN(·call32768, 32768) +CALLFN(·call65536, 65536) +CALLFN(·call131072, 131072) +CALLFN(·call262144, 262144) +CALLFN(·call524288, 524288) +CALLFN(·call1048576, 1048576) +CALLFN(·call2097152, 2097152) +CALLFN(·call4194304, 4194304) +CALLFN(·call8388608, 8388608) +CALLFN(·call16777216, 16777216) +CALLFN(·call33554432, 33554432) +CALLFN(·call67108864, 67108864) +CALLFN(·call134217728, 134217728) +CALLFN(·call268435456, 268435456) +CALLFN(·call536870912, 536870912) +CALLFN(·call1073741824, 1073741824) + +// func memhash32(p unsafe.Pointer, h uintptr) uintptr +TEXT runtime·memhash32<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-24 + MOVB runtime·useAeshash(SB), R10 + CBZ R10, noaes + MOVD $runtime·aeskeysched+0(SB), R3 + + VEOR V0.B16, V0.B16, V0.B16 + VLD1 (R3), [V2.B16] + VLD1 (R0), V0.S[1] + VMOV R1, V0.S[0] + + AESE V2.B16, V0.B16 + AESMC V0.B16, V0.B16 + AESE V2.B16, V0.B16 + AESMC V0.B16, V0.B16 + AESE V2.B16, V0.B16 + + VMOV V0.D[0], R0 + RET +noaes: + B runtime·memhash32Fallback<ABIInternal>(SB) + +// func memhash64(p unsafe.Pointer, h uintptr) uintptr +TEXT runtime·memhash64<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-24 + MOVB runtime·useAeshash(SB), R10 + CBZ R10, noaes + MOVD $runtime·aeskeysched+0(SB), R3 + + VEOR V0.B16, V0.B16, V0.B16 + VLD1 (R3), [V2.B16] + VLD1 (R0), V0.D[1] + VMOV R1, V0.D[0] + + AESE V2.B16, V0.B16 + AESMC V0.B16, V0.B16 + AESE V2.B16, V0.B16 + AESMC V0.B16, V0.B16 + AESE V2.B16, V0.B16 + + VMOV V0.D[0], R0 + RET +noaes: + B runtime·memhash64Fallback<ABIInternal>(SB) + +// func memhash(p unsafe.Pointer, h, size uintptr) uintptr +TEXT runtime·memhash<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-32 + MOVB runtime·useAeshash(SB), R10 + CBZ R10, noaes + B aeshashbody<>(SB) +noaes: + B runtime·memhashFallback<ABIInternal>(SB) + +// func strhash(p unsafe.Pointer, h uintptr) uintptr +TEXT runtime·strhash<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-24 + MOVB runtime·useAeshash(SB), R10 + CBZ R10, noaes + LDP (R0), (R0, R2) // string data / length + B aeshashbody<>(SB) +noaes: + B runtime·strhashFallback<ABIInternal>(SB) + +// R0: data +// R1: seed data +// R2: length +// At return, R0 = return value +TEXT aeshashbody<>(SB),NOSPLIT|NOFRAME,$0 + VEOR V30.B16, V30.B16, V30.B16 + VMOV R1, V30.D[0] + VMOV R2, V30.D[1] // load length into seed + + MOVD $runtime·aeskeysched+0(SB), R4 + VLD1.P 16(R4), [V0.B16] + AESE V30.B16, V0.B16 + AESMC V0.B16, V0.B16 + CMP $16, R2 + BLO aes0to15 + BEQ aes16 + CMP $32, R2 + BLS aes17to32 + CMP $64, R2 + BLS aes33to64 + CMP $128, R2 + BLS aes65to128 + B aes129plus + +aes0to15: + CBZ R2, aes0 + VEOR V2.B16, V2.B16, V2.B16 + TBZ $3, R2, less_than_8 + VLD1.P 8(R0), V2.D[0] + +less_than_8: + TBZ $2, R2, less_than_4 + VLD1.P 4(R0), V2.S[2] + +less_than_4: + TBZ $1, R2, less_than_2 + VLD1.P 2(R0), V2.H[6] + +less_than_2: + TBZ $0, R2, done + VLD1 (R0), V2.B[14] +done: + AESE V0.B16, V2.B16 + AESMC V2.B16, V2.B16 + AESE V0.B16, V2.B16 + AESMC V2.B16, V2.B16 + AESE V0.B16, V2.B16 + AESMC V2.B16, V2.B16 + + VMOV V2.D[0], R0 + RET + +aes0: + VMOV V0.D[0], R0 + RET + +aes16: + VLD1 (R0), [V2.B16] + B done + +aes17to32: + // make second seed + VLD1 (R4), [V1.B16] + AESE V30.B16, V1.B16 + AESMC V1.B16, V1.B16 + SUB $16, R2, R10 + VLD1.P (R0)(R10), [V2.B16] + VLD1 (R0), [V3.B16] + + AESE V0.B16, V2.B16 + AESMC V2.B16, V2.B16 + AESE V1.B16, V3.B16 + AESMC V3.B16, V3.B16 + + AESE V0.B16, V2.B16 + AESMC V2.B16, V2.B16 + AESE V1.B16, V3.B16 + AESMC V3.B16, V3.B16 + + AESE V0.B16, V2.B16 + AESE V1.B16, V3.B16 + + VEOR V3.B16, V2.B16, V2.B16 + + VMOV V2.D[0], R0 + RET + +aes33to64: + VLD1 (R4), [V1.B16, V2.B16, V3.B16] + AESE V30.B16, V1.B16 + AESMC V1.B16, V1.B16 + AESE V30.B16, V2.B16 + AESMC V2.B16, V2.B16 + AESE V30.B16, V3.B16 + AESMC V3.B16, V3.B16 + SUB $32, R2, R10 + + VLD1.P (R0)(R10), [V4.B16, V5.B16] + VLD1 (R0), [V6.B16, V7.B16] + + AESE V0.B16, V4.B16 + AESMC V4.B16, V4.B16 + AESE V1.B16, V5.B16 + AESMC V5.B16, V5.B16 + AESE V2.B16, V6.B16 + AESMC V6.B16, V6.B16 + AESE V3.B16, V7.B16 + AESMC V7.B16, V7.B16 + + AESE V0.B16, V4.B16 + AESMC V4.B16, V4.B16 + AESE V1.B16, V5.B16 + AESMC V5.B16, V5.B16 + AESE V2.B16, V6.B16 + AESMC V6.B16, V6.B16 + AESE V3.B16, V7.B16 + AESMC V7.B16, V7.B16 + + AESE V0.B16, V4.B16 + AESE V1.B16, V5.B16 + AESE V2.B16, V6.B16 + AESE V3.B16, V7.B16 + + VEOR V6.B16, V4.B16, V4.B16 + VEOR V7.B16, V5.B16, V5.B16 + VEOR V5.B16, V4.B16, V4.B16 + + VMOV V4.D[0], R0 + RET + +aes65to128: + VLD1.P 64(R4), [V1.B16, V2.B16, V3.B16, V4.B16] + VLD1 (R4), [V5.B16, V6.B16, V7.B16] + AESE V30.B16, V1.B16 + AESMC V1.B16, V1.B16 + AESE V30.B16, V2.B16 + AESMC V2.B16, V2.B16 + AESE V30.B16, V3.B16 + AESMC V3.B16, V3.B16 + AESE V30.B16, V4.B16 + AESMC V4.B16, V4.B16 + AESE V30.B16, V5.B16 + AESMC V5.B16, V5.B16 + AESE V30.B16, V6.B16 + AESMC V6.B16, V6.B16 + AESE V30.B16, V7.B16 + AESMC V7.B16, V7.B16 + + SUB $64, R2, R10 + VLD1.P (R0)(R10), [V8.B16, V9.B16, V10.B16, V11.B16] + VLD1 (R0), [V12.B16, V13.B16, V14.B16, V15.B16] + AESE V0.B16, V8.B16 + AESMC V8.B16, V8.B16 + AESE V1.B16, V9.B16 + AESMC V9.B16, V9.B16 + AESE V2.B16, V10.B16 + AESMC V10.B16, V10.B16 + AESE V3.B16, V11.B16 + AESMC V11.B16, V11.B16 + AESE V4.B16, V12.B16 + AESMC V12.B16, V12.B16 + AESE V5.B16, V13.B16 + AESMC V13.B16, V13.B16 + AESE V6.B16, V14.B16 + AESMC V14.B16, V14.B16 + AESE V7.B16, V15.B16 + AESMC V15.B16, V15.B16 + + AESE V0.B16, V8.B16 + AESMC V8.B16, V8.B16 + AESE V1.B16, V9.B16 + AESMC V9.B16, V9.B16 + AESE V2.B16, V10.B16 + AESMC V10.B16, V10.B16 + AESE V3.B16, V11.B16 + AESMC V11.B16, V11.B16 + AESE V4.B16, V12.B16 + AESMC V12.B16, V12.B16 + AESE V5.B16, V13.B16 + AESMC V13.B16, V13.B16 + AESE V6.B16, V14.B16 + AESMC V14.B16, V14.B16 + AESE V7.B16, V15.B16 + AESMC V15.B16, V15.B16 + + AESE V0.B16, V8.B16 + AESE V1.B16, V9.B16 + AESE V2.B16, V10.B16 + AESE V3.B16, V11.B16 + AESE V4.B16, V12.B16 + AESE V5.B16, V13.B16 + AESE V6.B16, V14.B16 + AESE V7.B16, V15.B16 + + VEOR V12.B16, V8.B16, V8.B16 + VEOR V13.B16, V9.B16, V9.B16 + VEOR V14.B16, V10.B16, V10.B16 + VEOR V15.B16, V11.B16, V11.B16 + VEOR V10.B16, V8.B16, V8.B16 + VEOR V11.B16, V9.B16, V9.B16 + VEOR V9.B16, V8.B16, V8.B16 + + VMOV V8.D[0], R0 + RET + +aes129plus: + PRFM (R0), PLDL1KEEP + VLD1.P 64(R4), [V1.B16, V2.B16, V3.B16, V4.B16] + VLD1 (R4), [V5.B16, V6.B16, V7.B16] + AESE V30.B16, V1.B16 + AESMC V1.B16, V1.B16 + AESE V30.B16, V2.B16 + AESMC V2.B16, V2.B16 + AESE V30.B16, V3.B16 + AESMC V3.B16, V3.B16 + AESE V30.B16, V4.B16 + AESMC V4.B16, V4.B16 + AESE V30.B16, V5.B16 + AESMC V5.B16, V5.B16 + AESE V30.B16, V6.B16 + AESMC V6.B16, V6.B16 + AESE V30.B16, V7.B16 + AESMC V7.B16, V7.B16 + ADD R0, R2, R10 + SUB $128, R10, R10 + VLD1.P 64(R10), [V8.B16, V9.B16, V10.B16, V11.B16] + VLD1 (R10), [V12.B16, V13.B16, V14.B16, V15.B16] + SUB $1, R2, R2 + LSR $7, R2, R2 + +aesloop: + AESE V8.B16, V0.B16 + AESMC V0.B16, V0.B16 + AESE V9.B16, V1.B16 + AESMC V1.B16, V1.B16 + AESE V10.B16, V2.B16 + AESMC V2.B16, V2.B16 + AESE V11.B16, V3.B16 + AESMC V3.B16, V3.B16 + AESE V12.B16, V4.B16 + AESMC V4.B16, V4.B16 + AESE V13.B16, V5.B16 + AESMC V5.B16, V5.B16 + AESE V14.B16, V6.B16 + AESMC V6.B16, V6.B16 + AESE V15.B16, V7.B16 + AESMC V7.B16, V7.B16 + + VLD1.P 64(R0), [V8.B16, V9.B16, V10.B16, V11.B16] + AESE V8.B16, V0.B16 + AESMC V0.B16, V0.B16 + AESE V9.B16, V1.B16 + AESMC V1.B16, V1.B16 + AESE V10.B16, V2.B16 + AESMC V2.B16, V2.B16 + AESE V11.B16, V3.B16 + AESMC V3.B16, V3.B16 + + VLD1.P 64(R0), [V12.B16, V13.B16, V14.B16, V15.B16] + AESE V12.B16, V4.B16 + AESMC V4.B16, V4.B16 + AESE V13.B16, V5.B16 + AESMC V5.B16, V5.B16 + AESE V14.B16, V6.B16 + AESMC V6.B16, V6.B16 + AESE V15.B16, V7.B16 + AESMC V7.B16, V7.B16 + SUB $1, R2, R2 + CBNZ R2, aesloop + + AESE V8.B16, V0.B16 + AESMC V0.B16, V0.B16 + AESE V9.B16, V1.B16 + AESMC V1.B16, V1.B16 + AESE V10.B16, V2.B16 + AESMC V2.B16, V2.B16 + AESE V11.B16, V3.B16 + AESMC V3.B16, V3.B16 + AESE V12.B16, V4.B16 + AESMC V4.B16, V4.B16 + AESE V13.B16, V5.B16 + AESMC V5.B16, V5.B16 + AESE V14.B16, V6.B16 + AESMC V6.B16, V6.B16 + AESE V15.B16, V7.B16 + AESMC V7.B16, V7.B16 + + AESE V8.B16, V0.B16 + AESMC V0.B16, V0.B16 + AESE V9.B16, V1.B16 + AESMC V1.B16, V1.B16 + AESE V10.B16, V2.B16 + AESMC V2.B16, V2.B16 + AESE V11.B16, V3.B16 + AESMC V3.B16, V3.B16 + AESE V12.B16, V4.B16 + AESMC V4.B16, V4.B16 + AESE V13.B16, V5.B16 + AESMC V5.B16, V5.B16 + AESE V14.B16, V6.B16 + AESMC V6.B16, V6.B16 + AESE V15.B16, V7.B16 + AESMC V7.B16, V7.B16 + + AESE V8.B16, V0.B16 + AESE V9.B16, V1.B16 + AESE V10.B16, V2.B16 + AESE V11.B16, V3.B16 + AESE V12.B16, V4.B16 + AESE V13.B16, V5.B16 + AESE V14.B16, V6.B16 + AESE V15.B16, V7.B16 + + VEOR V0.B16, V1.B16, V0.B16 + VEOR V2.B16, V3.B16, V2.B16 + VEOR V4.B16, V5.B16, V4.B16 + VEOR V6.B16, V7.B16, V6.B16 + VEOR V0.B16, V2.B16, V0.B16 + VEOR V4.B16, V6.B16, V4.B16 + VEOR V4.B16, V0.B16, V0.B16 + + VMOV V0.D[0], R0 + RET + +TEXT runtime·procyield(SB),NOSPLIT,$0-0 + MOVWU cycles+0(FP), R0 +again: + YIELD + SUBW $1, R0 + CBNZ R0, again + RET + +// Save state of caller into g->sched, +// but using fake PC from systemstack_switch. +// Must only be called from functions with no locals ($0) +// or else unwinding from systemstack_switch is incorrect. +// Smashes R0. +TEXT gosave_systemstack_switch<>(SB),NOSPLIT|NOFRAME,$0 + MOVD $runtime·systemstack_switch(SB), R0 + ADD $8, R0 // get past prologue + MOVD R0, (g_sched+gobuf_pc)(g) + MOVD RSP, R0 + MOVD R0, (g_sched+gobuf_sp)(g) + MOVD R29, (g_sched+gobuf_bp)(g) + MOVD $0, (g_sched+gobuf_lr)(g) + MOVD $0, (g_sched+gobuf_ret)(g) + // Assert ctxt is zero. See func save. + MOVD (g_sched+gobuf_ctxt)(g), R0 + CBZ R0, 2(PC) + CALL runtime·abort(SB) + RET + +// func asmcgocall_no_g(fn, arg unsafe.Pointer) +// Call fn(arg) aligned appropriately for the gcc ABI. +// Called on a system stack, and there may be no g yet (during needm). +TEXT ·asmcgocall_no_g(SB),NOSPLIT,$0-16 + MOVD fn+0(FP), R1 + MOVD arg+8(FP), R0 + SUB $16, RSP // skip over saved frame pointer below RSP + BL (R1) + ADD $16, RSP // skip over saved frame pointer below RSP + RET + +// func asmcgocall(fn, arg unsafe.Pointer) int32 +// Call fn(arg) on the scheduler stack, +// aligned appropriately for the gcc ABI. +// See cgocall.go for more details. +TEXT ·asmcgocall(SB),NOSPLIT,$0-20 + MOVD fn+0(FP), R1 + MOVD arg+8(FP), R0 + + MOVD RSP, R2 // save original stack pointer + CBZ g, nosave + MOVD g, R4 + + // Figure out if we need to switch to m->g0 stack. + // We get called to create new OS threads too, and those + // come in on the m->g0 stack already. Or we might already + // be on the m->gsignal stack. + MOVD g_m(g), R8 + MOVD m_gsignal(R8), R3 + CMP R3, g + BEQ nosave + MOVD m_g0(R8), R3 + CMP R3, g + BEQ nosave + + // Switch to system stack. + MOVD R0, R9 // gosave_systemstack_switch<> and save_g might clobber R0 + BL gosave_systemstack_switch<>(SB) + MOVD R3, g + BL runtime·save_g(SB) + MOVD (g_sched+gobuf_sp)(g), R0 + MOVD R0, RSP + MOVD (g_sched+gobuf_bp)(g), R29 + MOVD R9, R0 + + // Now on a scheduling stack (a pthread-created stack). + // Save room for two of our pointers /*, plus 32 bytes of callee + // save area that lives on the caller stack. */ + MOVD RSP, R13 + SUB $16, R13 + MOVD R13, RSP + MOVD R4, 0(RSP) // save old g on stack + MOVD (g_stack+stack_hi)(R4), R4 + SUB R2, R4 + MOVD R4, 8(RSP) // save depth in old g stack (can't just save SP, as stack might be copied during a callback) + BL (R1) + MOVD R0, R9 + + // Restore g, stack pointer. R0 is errno, so don't touch it + MOVD 0(RSP), g + BL runtime·save_g(SB) + MOVD (g_stack+stack_hi)(g), R5 + MOVD 8(RSP), R6 + SUB R6, R5 + MOVD R9, R0 + MOVD R5, RSP + + MOVW R0, ret+16(FP) + RET + +nosave: + // Running on a system stack, perhaps even without a g. + // Having no g can happen during thread creation or thread teardown + // (see needm/dropm on Solaris, for example). + // This code is like the above sequence but without saving/restoring g + // and without worrying about the stack moving out from under us + // (because we're on a system stack, not a goroutine stack). + // The above code could be used directly if already on a system stack, + // but then the only path through this code would be a rare case on Solaris. + // Using this code for all "already on system stack" calls exercises it more, + // which should help keep it correct. + MOVD RSP, R13 + SUB $16, R13 + MOVD R13, RSP + MOVD $0, R4 + MOVD R4, 0(RSP) // Where above code stores g, in case someone looks during debugging. + MOVD R2, 8(RSP) // Save original stack pointer. + BL (R1) + // Restore stack pointer. + MOVD 8(RSP), R2 + MOVD R2, RSP + MOVD R0, ret+16(FP) + RET + +// cgocallback(fn, frame unsafe.Pointer, ctxt uintptr) +// See cgocall.go for more details. +TEXT ·cgocallback(SB),NOSPLIT,$24-24 + NO_LOCAL_POINTERS + + // Skip cgocallbackg, just dropm when fn is nil, and frame is the saved g. + // It is used to dropm while thread is exiting. + MOVD fn+0(FP), R1 + CBNZ R1, loadg + // Restore the g from frame. + MOVD frame+8(FP), g + B dropm + +loadg: + // Load g from thread-local storage. + BL runtime·load_g(SB) + + // If g is nil, Go did not create the current thread, + // or if this thread never called into Go on pthread platforms. + // Call needm to obtain one for temporary use. + // In this case, we're running on the thread stack, so there's + // lots of space, but the linker doesn't know. Hide the call from + // the linker analysis by using an indirect call. + CBZ g, needm + + MOVD g_m(g), R8 + MOVD R8, savedm-8(SP) + B havem + +needm: + MOVD g, savedm-8(SP) // g is zero, so is m. + MOVD $runtime·needAndBindM(SB), R0 + BL (R0) + + // Set m->g0->sched.sp = SP, so that if a panic happens + // during the function we are about to execute, it will + // have a valid SP to run on the g0 stack. + // The next few lines (after the havem label) + // will save this SP onto the stack and then write + // the same SP back to m->sched.sp. That seems redundant, + // but if an unrecovered panic happens, unwindm will + // restore the g->sched.sp from the stack location + // and then systemstack will try to use it. If we don't set it here, + // that restored SP will be uninitialized (typically 0) and + // will not be usable. + MOVD g_m(g), R8 + MOVD m_g0(R8), R3 + MOVD RSP, R0 + MOVD R0, (g_sched+gobuf_sp)(R3) + MOVD R29, (g_sched+gobuf_bp)(R3) + +havem: + // Now there's a valid m, and we're running on its m->g0. + // Save current m->g0->sched.sp on stack and then set it to SP. + // Save current sp in m->g0->sched.sp in preparation for + // switch back to m->curg stack. + // NOTE: unwindm knows that the saved g->sched.sp is at 16(RSP) aka savedsp-16(SP). + // Beware that the frame size is actually 32+16. + MOVD m_g0(R8), R3 + MOVD (g_sched+gobuf_sp)(R3), R4 + MOVD R4, savedsp-16(SP) + MOVD RSP, R0 + MOVD R0, (g_sched+gobuf_sp)(R3) + + // Switch to m->curg stack and call runtime.cgocallbackg. + // Because we are taking over the execution of m->curg + // but *not* resuming what had been running, we need to + // save that information (m->curg->sched) so we can restore it. + // We can restore m->curg->sched.sp easily, because calling + // runtime.cgocallbackg leaves SP unchanged upon return. + // To save m->curg->sched.pc, we push it onto the curg stack and + // open a frame the same size as cgocallback's g0 frame. + // Once we switch to the curg stack, the pushed PC will appear + // to be the return PC of cgocallback, so that the traceback + // will seamlessly trace back into the earlier calls. + MOVD m_curg(R8), g + BL runtime·save_g(SB) + MOVD (g_sched+gobuf_sp)(g), R4 // prepare stack as R4 + MOVD (g_sched+gobuf_pc)(g), R5 + MOVD R5, -48(R4) + MOVD (g_sched+gobuf_bp)(g), R5 + MOVD R5, -56(R4) + // Gather our arguments into registers. + MOVD fn+0(FP), R1 + MOVD frame+8(FP), R2 + MOVD ctxt+16(FP), R3 + MOVD $-48(R4), R0 // maintain 16-byte SP alignment + MOVD R0, RSP // switch stack + MOVD R1, 8(RSP) + MOVD R2, 16(RSP) + MOVD R3, 24(RSP) + MOVD $runtime·cgocallbackg(SB), R0 + CALL (R0) // indirect call to bypass nosplit check. We're on a different stack now. + + // Restore g->sched (== m->curg->sched) from saved values. + MOVD 0(RSP), R5 + MOVD R5, (g_sched+gobuf_pc)(g) + MOVD RSP, R4 + ADD $48, R4, R4 + MOVD R4, (g_sched+gobuf_sp)(g) + + // Switch back to m->g0's stack and restore m->g0->sched.sp. + // (Unlike m->curg, the g0 goroutine never uses sched.pc, + // so we do not have to restore it.) + MOVD g_m(g), R8 + MOVD m_g0(R8), g + BL runtime·save_g(SB) + MOVD (g_sched+gobuf_sp)(g), R0 + MOVD R0, RSP + MOVD savedsp-16(SP), R4 + MOVD R4, (g_sched+gobuf_sp)(g) + + // If the m on entry was nil, we called needm above to borrow an m, + // 1. for the duration of the call on non-pthread platforms, + // 2. or the duration of the C thread alive on pthread platforms. + // If the m on entry wasn't nil, + // 1. the thread might be a Go thread, + // 2. or it wasn't the first call from a C thread on pthread platforms, + // since then we skip dropm to reuse the m in the first call. + MOVD savedm-8(SP), R6 + CBNZ R6, droppedm + + // Skip dropm to reuse it in the next call, when a pthread key has been created. + MOVD _cgo_pthread_key_created(SB), R6 + // It means cgo is disabled when _cgo_pthread_key_created is a nil pointer, need dropm. + CBZ R6, dropm + MOVD (R6), R6 + CBNZ R6, droppedm + +dropm: + MOVD $runtime·dropm(SB), R0 + BL (R0) +droppedm: + + // Done! + RET + +// Called from cgo wrappers, this function returns g->m->curg.stack.hi. +// Must obey the gcc calling convention. +TEXT _cgo_topofstack(SB),NOSPLIT,$24 + // g (R28) and REGTMP (R27) might be clobbered by load_g. They + // are callee-save in the gcc calling convention, so save them. + MOVD R27, savedR27-8(SP) + MOVD g, saveG-16(SP) + + BL runtime·load_g(SB) + MOVD g_m(g), R0 + MOVD m_curg(R0), R0 + MOVD (g_stack+stack_hi)(R0), R0 + + MOVD saveG-16(SP), g + MOVD savedR28-8(SP), R27 + RET + +// void setg(G*); set g. for use by needm. +TEXT runtime·setg(SB), NOSPLIT, $0-8 + MOVD gg+0(FP), g + // This only happens if iscgo, so jump straight to save_g + BL runtime·save_g(SB) + RET + +// void setg_gcc(G*); set g called from gcc +TEXT setg_gcc<>(SB),NOSPLIT,$8 + MOVD R0, g + MOVD R27, savedR27-8(SP) + BL runtime·save_g(SB) + MOVD savedR27-8(SP), R27 + RET + +TEXT runtime·emptyfunc(SB),0,$0-0 + RET + +TEXT runtime·abort(SB),NOSPLIT|NOFRAME,$0-0 + MOVD ZR, R0 + MOVD (R0), R0 + UNDEF + +TEXT runtime·return0(SB), NOSPLIT, $0 + MOVW $0, R0 + RET + +// The top-most function running on a goroutine +// returns to goexit+PCQuantum. +TEXT runtime·goexit(SB),NOSPLIT|NOFRAME|TOPFRAME,$0-0 + MOVD R0, R0 // NOP + BL runtime·goexit1(SB) // does not return + +// This is called from .init_array and follows the platform, not Go, ABI. +TEXT runtime·addmoduledata(SB),NOSPLIT,$0-0 + SUB $0x10, RSP + MOVD R27, 8(RSP) // The access to global variables below implicitly uses R27, which is callee-save + MOVD runtime·lastmoduledatap(SB), R1 + MOVD R0, moduledata_next(R1) + MOVD R0, runtime·lastmoduledatap(SB) + MOVD 8(RSP), R27 + ADD $0x10, RSP + RET + +TEXT ·checkASM(SB),NOSPLIT,$0-1 + MOVW $1, R3 + MOVB R3, ret+0(FP) + RET + +// gcWriteBarrier informs the GC about heap pointer writes. +// +// gcWriteBarrier does NOT follow the Go ABI. It accepts the +// number of bytes of buffer needed in R25, and returns a pointer +// to the buffer space in R25. +// It clobbers condition codes. +// It does not clobber any general-purpose registers except R27, +// but may clobber others (e.g., floating point registers) +// The act of CALLing gcWriteBarrier will clobber R30 (LR). +TEXT gcWriteBarrier<>(SB),NOSPLIT,$200 + // Save the registers clobbered by the fast path. + STP (R0, R1), 184(RSP) +retry: + MOVD g_m(g), R0 + MOVD m_p(R0), R0 + MOVD (p_wbBuf+wbBuf_next)(R0), R1 + MOVD (p_wbBuf+wbBuf_end)(R0), R27 + // Increment wbBuf.next position. + ADD R25, R1 + // Is the buffer full? + CMP R27, R1 + BHI flush + // Commit to the larger buffer. + MOVD R1, (p_wbBuf+wbBuf_next)(R0) + // Make return value (the original next position) + SUB R25, R1, R25 + // Restore registers. + LDP 184(RSP), (R0, R1) + RET + +flush: + // Save all general purpose registers since these could be + // clobbered by wbBufFlush and were not saved by the caller. + // R0 and R1 already saved + STP (R2, R3), 1*8(RSP) + STP (R4, R5), 3*8(RSP) + STP (R6, R7), 5*8(RSP) + STP (R8, R9), 7*8(RSP) + STP (R10, R11), 9*8(RSP) + STP (R12, R13), 11*8(RSP) + STP (R14, R15), 13*8(RSP) + // R16, R17 may be clobbered by linker trampoline + // R18 is unused. + STP (R19, R20), 15*8(RSP) + STP (R21, R22), 17*8(RSP) + STP (R23, R24), 19*8(RSP) + STP (R25, R26), 21*8(RSP) + // R27 is temp register. + // R28 is g. + // R29 is frame pointer (unused). + // R30 is LR, which was saved by the prologue. + // R31 is SP. + + CALL runtime·wbBufFlush(SB) + LDP 1*8(RSP), (R2, R3) + LDP 3*8(RSP), (R4, R5) + LDP 5*8(RSP), (R6, R7) + LDP 7*8(RSP), (R8, R9) + LDP 9*8(RSP), (R10, R11) + LDP 11*8(RSP), (R12, R13) + LDP 13*8(RSP), (R14, R15) + LDP 15*8(RSP), (R19, R20) + LDP 17*8(RSP), (R21, R22) + LDP 19*8(RSP), (R23, R24) + LDP 21*8(RSP), (R25, R26) + JMP retry + +TEXT runtime·gcWriteBarrier1<ABIInternal>(SB),NOSPLIT,$0 + MOVD $8, R25 + JMP gcWriteBarrier<>(SB) +TEXT runtime·gcWriteBarrier2<ABIInternal>(SB),NOSPLIT,$0 + MOVD $16, R25 + JMP gcWriteBarrier<>(SB) +TEXT runtime·gcWriteBarrier3<ABIInternal>(SB),NOSPLIT,$0 + MOVD $24, R25 + JMP gcWriteBarrier<>(SB) +TEXT runtime·gcWriteBarrier4<ABIInternal>(SB),NOSPLIT,$0 + MOVD $32, R25 + JMP gcWriteBarrier<>(SB) +TEXT runtime·gcWriteBarrier5<ABIInternal>(SB),NOSPLIT,$0 + MOVD $40, R25 + JMP gcWriteBarrier<>(SB) +TEXT runtime·gcWriteBarrier6<ABIInternal>(SB),NOSPLIT,$0 + MOVD $48, R25 + JMP gcWriteBarrier<>(SB) +TEXT runtime·gcWriteBarrier7<ABIInternal>(SB),NOSPLIT,$0 + MOVD $56, R25 + JMP gcWriteBarrier<>(SB) +TEXT runtime·gcWriteBarrier8<ABIInternal>(SB),NOSPLIT,$0 + MOVD $64, R25 + JMP gcWriteBarrier<>(SB) + +DATA debugCallFrameTooLarge<>+0x00(SB)/20, $"call frame too large" +GLOBL debugCallFrameTooLarge<>(SB), RODATA, $20 // Size duplicated below + +// debugCallV2 is the entry point for debugger-injected function +// calls on running goroutines. It informs the runtime that a +// debug call has been injected and creates a call frame for the +// debugger to fill in. +// +// To inject a function call, a debugger should: +// 1. Check that the goroutine is in state _Grunning and that +// there are at least 288 bytes free on the stack. +// 2. Set SP as SP-16. +// 3. Store the current LR in (SP) (using the SP after step 2). +// 4. Store the current PC in the LR register. +// 5. Write the desired argument frame size at SP-16 +// 6. Save all machine registers (including flags and fpsimd registers) +// so they can be restored later by the debugger. +// 7. Set the PC to debugCallV2 and resume execution. +// +// If the goroutine is in state _Grunnable, then it's not generally +// safe to inject a call because it may return out via other runtime +// operations. Instead, the debugger should unwind the stack to find +// the return to non-runtime code, add a temporary breakpoint there, +// and inject the call once that breakpoint is hit. +// +// If the goroutine is in any other state, it's not safe to inject a call. +// +// This function communicates back to the debugger by setting R20 and +// invoking BRK to raise a breakpoint signal. Note that the signal PC of +// the signal triggered by the BRK instruction is the PC where the signal +// is trapped, not the next PC, so to resume execution, the debugger needs +// to set the signal PC to PC+4. See the comments in the implementation for +// the protocol the debugger is expected to follow. InjectDebugCall in the +// runtime tests demonstrates this protocol. +// +// The debugger must ensure that any pointers passed to the function +// obey escape analysis requirements. Specifically, it must not pass +// a stack pointer to an escaping argument. debugCallV2 cannot check +// this invariant. +// +// This is ABIInternal because Go code injects its PC directly into new +// goroutine stacks. +TEXT runtime·debugCallV2<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-0 + STP (R29, R30), -280(RSP) + SUB $272, RSP, RSP + SUB $8, RSP, R29 + // Save all registers that may contain pointers so they can be + // conservatively scanned. + // + // We can't do anything that might clobber any of these + // registers before this. + STP (R27, g), (30*8)(RSP) + STP (R25, R26), (28*8)(RSP) + STP (R23, R24), (26*8)(RSP) + STP (R21, R22), (24*8)(RSP) + STP (R19, R20), (22*8)(RSP) + STP (R16, R17), (20*8)(RSP) + STP (R14, R15), (18*8)(RSP) + STP (R12, R13), (16*8)(RSP) + STP (R10, R11), (14*8)(RSP) + STP (R8, R9), (12*8)(RSP) + STP (R6, R7), (10*8)(RSP) + STP (R4, R5), (8*8)(RSP) + STP (R2, R3), (6*8)(RSP) + STP (R0, R1), (4*8)(RSP) + + // Perform a safe-point check. + MOVD R30, 8(RSP) // Caller's PC + CALL runtime·debugCallCheck(SB) + MOVD 16(RSP), R0 + CBZ R0, good + + // The safety check failed. Put the reason string at the top + // of the stack. + MOVD R0, 8(RSP) + MOVD 24(RSP), R0 + MOVD R0, 16(RSP) + + // Set R20 to 8 and invoke BRK. The debugger should get the + // reason a call can't be injected from SP+8 and resume execution. + MOVD $8, R20 + BREAK + JMP restore + +good: + // Registers are saved and it's safe to make a call. + // Open up a call frame, moving the stack if necessary. + // + // Once the frame is allocated, this will set R20 to 0 and + // invoke BRK. The debugger should write the argument + // frame for the call at SP+8, set up argument registers, + // set the LR as the signal PC + 4, set the PC to the function + // to call, set R26 to point to the closure (if a closure call), + // and resume execution. + // + // If the function returns, this will set R20 to 1 and invoke + // BRK. The debugger can then inspect any return value saved + // on the stack at SP+8 and in registers. To resume execution, + // the debugger should restore the LR from (SP). + // + // If the function panics, this will set R20 to 2 and invoke BRK. + // The interface{} value of the panic will be at SP+8. The debugger + // can inspect the panic value and resume execution again. +#define DEBUG_CALL_DISPATCH(NAME,MAXSIZE) \ + CMP $MAXSIZE, R0; \ + BGT 5(PC); \ + MOVD $NAME(SB), R0; \ + MOVD R0, 8(RSP); \ + CALL runtime·debugCallWrap(SB); \ + JMP restore + + MOVD 256(RSP), R0 // the argument frame size + DEBUG_CALL_DISPATCH(debugCall32<>, 32) + DEBUG_CALL_DISPATCH(debugCall64<>, 64) + DEBUG_CALL_DISPATCH(debugCall128<>, 128) + DEBUG_CALL_DISPATCH(debugCall256<>, 256) + DEBUG_CALL_DISPATCH(debugCall512<>, 512) + DEBUG_CALL_DISPATCH(debugCall1024<>, 1024) + DEBUG_CALL_DISPATCH(debugCall2048<>, 2048) + DEBUG_CALL_DISPATCH(debugCall4096<>, 4096) + DEBUG_CALL_DISPATCH(debugCall8192<>, 8192) + DEBUG_CALL_DISPATCH(debugCall16384<>, 16384) + DEBUG_CALL_DISPATCH(debugCall32768<>, 32768) + DEBUG_CALL_DISPATCH(debugCall65536<>, 65536) + // The frame size is too large. Report the error. + MOVD $debugCallFrameTooLarge<>(SB), R0 + MOVD R0, 8(RSP) + MOVD $20, R0 + MOVD R0, 16(RSP) // length of debugCallFrameTooLarge string + MOVD $8, R20 + BREAK + JMP restore + +restore: + // Calls and failures resume here. + // + // Set R20 to 16 and invoke BRK. The debugger should restore + // all registers except for PC and RSP and resume execution. + MOVD $16, R20 + BREAK + // We must not modify flags after this point. + + // Restore pointer-containing registers, which may have been + // modified from the debugger's copy by stack copying. + LDP (30*8)(RSP), (R27, g) + LDP (28*8)(RSP), (R25, R26) + LDP (26*8)(RSP), (R23, R24) + LDP (24*8)(RSP), (R21, R22) + LDP (22*8)(RSP), (R19, R20) + LDP (20*8)(RSP), (R16, R17) + LDP (18*8)(RSP), (R14, R15) + LDP (16*8)(RSP), (R12, R13) + LDP (14*8)(RSP), (R10, R11) + LDP (12*8)(RSP), (R8, R9) + LDP (10*8)(RSP), (R6, R7) + LDP (8*8)(RSP), (R4, R5) + LDP (6*8)(RSP), (R2, R3) + LDP (4*8)(RSP), (R0, R1) + + LDP -8(RSP), (R29, R27) + ADD $288, RSP, RSP // Add 16 more bytes, see saveSigContext + MOVD -16(RSP), R30 // restore old lr + JMP (R27) + +// runtime.debugCallCheck assumes that functions defined with the +// DEBUG_CALL_FN macro are safe points to inject calls. +#define DEBUG_CALL_FN(NAME,MAXSIZE) \ +TEXT NAME(SB),WRAPPER,$MAXSIZE-0; \ + NO_LOCAL_POINTERS; \ + MOVD $0, R20; \ + BREAK; \ + MOVD $1, R20; \ + BREAK; \ + RET +DEBUG_CALL_FN(debugCall32<>, 32) +DEBUG_CALL_FN(debugCall64<>, 64) +DEBUG_CALL_FN(debugCall128<>, 128) +DEBUG_CALL_FN(debugCall256<>, 256) +DEBUG_CALL_FN(debugCall512<>, 512) +DEBUG_CALL_FN(debugCall1024<>, 1024) +DEBUG_CALL_FN(debugCall2048<>, 2048) +DEBUG_CALL_FN(debugCall4096<>, 4096) +DEBUG_CALL_FN(debugCall8192<>, 8192) +DEBUG_CALL_FN(debugCall16384<>, 16384) +DEBUG_CALL_FN(debugCall32768<>, 32768) +DEBUG_CALL_FN(debugCall65536<>, 65536) + +// func debugCallPanicked(val interface{}) +TEXT runtime·debugCallPanicked(SB),NOSPLIT,$16-16 + // Copy the panic value to the top of stack at SP+8. + MOVD val_type+0(FP), R0 + MOVD R0, 8(RSP) + MOVD val_data+8(FP), R0 + MOVD R0, 16(RSP) + MOVD $2, R20 + BREAK + RET + +// Note: these functions use a special calling convention to save generated code space. +// Arguments are passed in registers, but the space for those arguments are allocated +// in the caller's stack frame. These stubs write the args into that stack space and +// then tail call to the corresponding runtime handler. +// The tail call makes these stubs disappear in backtraces. +// +// Defined as ABIInternal since the compiler generates ABIInternal +// calls to it directly and it does not use the stack-based Go ABI. +TEXT runtime·panicIndex<ABIInternal>(SB),NOSPLIT,$0-16 + JMP runtime·goPanicIndex<ABIInternal>(SB) +TEXT runtime·panicIndexU<ABIInternal>(SB),NOSPLIT,$0-16 + JMP runtime·goPanicIndexU<ABIInternal>(SB) +TEXT runtime·panicSliceAlen<ABIInternal>(SB),NOSPLIT,$0-16 + MOVD R1, R0 + MOVD R2, R1 + JMP runtime·goPanicSliceAlen<ABIInternal>(SB) +TEXT runtime·panicSliceAlenU<ABIInternal>(SB),NOSPLIT,$0-16 + MOVD R1, R0 + MOVD R2, R1 + JMP runtime·goPanicSliceAlenU<ABIInternal>(SB) +TEXT runtime·panicSliceAcap<ABIInternal>(SB),NOSPLIT,$0-16 + MOVD R1, R0 + MOVD R2, R1 + JMP runtime·goPanicSliceAcap<ABIInternal>(SB) +TEXT runtime·panicSliceAcapU<ABIInternal>(SB),NOSPLIT,$0-16 + MOVD R1, R0 + MOVD R2, R1 + JMP runtime·goPanicSliceAcapU<ABIInternal>(SB) +TEXT runtime·panicSliceB<ABIInternal>(SB),NOSPLIT,$0-16 + JMP runtime·goPanicSliceB<ABIInternal>(SB) +TEXT runtime·panicSliceBU<ABIInternal>(SB),NOSPLIT,$0-16 + JMP runtime·goPanicSliceBU<ABIInternal>(SB) +TEXT runtime·panicSlice3Alen<ABIInternal>(SB),NOSPLIT,$0-16 + MOVD R2, R0 + MOVD R3, R1 + JMP runtime·goPanicSlice3Alen<ABIInternal>(SB) +TEXT runtime·panicSlice3AlenU<ABIInternal>(SB),NOSPLIT,$0-16 + MOVD R2, R0 + MOVD R3, R1 + JMP runtime·goPanicSlice3AlenU<ABIInternal>(SB) +TEXT runtime·panicSlice3Acap<ABIInternal>(SB),NOSPLIT,$0-16 + MOVD R2, R0 + MOVD R3, R1 + JMP runtime·goPanicSlice3Acap<ABIInternal>(SB) +TEXT runtime·panicSlice3AcapU<ABIInternal>(SB),NOSPLIT,$0-16 + MOVD R2, R0 + MOVD R3, R1 + JMP runtime·goPanicSlice3AcapU<ABIInternal>(SB) +TEXT runtime·panicSlice3B<ABIInternal>(SB),NOSPLIT,$0-16 + MOVD R1, R0 + MOVD R2, R1 + JMP runtime·goPanicSlice3B<ABIInternal>(SB) +TEXT runtime·panicSlice3BU<ABIInternal>(SB),NOSPLIT,$0-16 + MOVD R1, R0 + MOVD R2, R1 + JMP runtime·goPanicSlice3BU<ABIInternal>(SB) +TEXT runtime·panicSlice3C<ABIInternal>(SB),NOSPLIT,$0-16 + JMP runtime·goPanicSlice3C<ABIInternal>(SB) +TEXT runtime·panicSlice3CU<ABIInternal>(SB),NOSPLIT,$0-16 + JMP runtime·goPanicSlice3CU<ABIInternal>(SB) +TEXT runtime·panicSliceConvert<ABIInternal>(SB),NOSPLIT,$0-16 + MOVD R2, R0 + MOVD R3, R1 + JMP runtime·goPanicSliceConvert<ABIInternal>(SB) + +TEXT ·getfp<ABIInternal>(SB),NOSPLIT|NOFRAME,$0 + MOVD R29, R0 + RET |