| // 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. |
| |
| #include "go_asm.h" |
| #include "go_tls.h" |
| #include "funcdata.h" |
| #include "textflag.h" |
| |
| #define REGCTXT R29 |
| |
| TEXT runtime·rt0_go(SB),NOSPLIT|TOPFRAME,$0 |
| // R3 = stack; R4 = argc; R5 = argv |
| |
| ADDV $-24, R3 |
| MOVW R4, 8(R3) // argc |
| MOVV R5, 16(R3) // argv |
| |
| // create istack out of the given (operating system) stack. |
| // _cgo_init may update stackguard. |
| MOVV $runtime·g0(SB), g |
| MOVV $(-64*1024), R30 |
| ADDV R30, R3, R19 |
| MOVV R19, g_stackguard0(g) |
| MOVV R19, g_stackguard1(g) |
| MOVV R19, (g_stack+stack_lo)(g) |
| MOVV R3, (g_stack+stack_hi)(g) |
| |
| // if there is a _cgo_init, call it using the gcc ABI. |
| MOVV _cgo_init(SB), R25 |
| BEQ R25, nocgo |
| |
| MOVV R0, R7 // arg 3: not used |
| MOVV R0, R6 // arg 2: not used |
| MOVV $setg_gcc<>(SB), R5 // arg 1: setg |
| MOVV g, R4 // arg 0: G |
| JAL (R25) |
| |
| nocgo: |
| // update stackguard after _cgo_init |
| MOVV (g_stack+stack_lo)(g), R19 |
| ADDV $const__StackGuard, R19 |
| MOVV R19, g_stackguard0(g) |
| MOVV R19, g_stackguard1(g) |
| |
| // set the per-goroutine and per-mach "registers" |
| MOVV $runtime·m0(SB), R19 |
| |
| // save m->g0 = g0 |
| MOVV g, m_g0(R19) |
| // save m0 to g0->m |
| MOVV R19, g_m(g) |
| |
| JAL runtime·check(SB) |
| |
| // args are already prepared |
| JAL runtime·args(SB) |
| JAL runtime·osinit(SB) |
| JAL runtime·schedinit(SB) |
| |
| // create a new goroutine to start program |
| MOVV $runtime·mainPC(SB), R19 // entry |
| ADDV $-16, R3 |
| MOVV R19, 8(R3) |
| MOVV R0, 0(R3) |
| JAL runtime·newproc(SB) |
| ADDV $16, R3 |
| |
| // start this M |
| JAL runtime·mstart(SB) |
| |
| MOVV R0, 1(R0) |
| RET |
| |
| DATA runtime·mainPC+0(SB)/8,$runtime·main(SB) |
| GLOBL runtime·mainPC(SB),RODATA,$8 |
| |
| 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 |
| JAL runtime·mstart0(SB) |
| RET // not reached |
| |
| /* |
| * go-routine |
| */ |
| |
| // void gogo(Gobuf*) |
| // restore state from Gobuf; longjmp |
| TEXT runtime·gogo(SB), NOSPLIT|NOFRAME, $0-8 |
| MOVV buf+0(FP), R4 |
| MOVV gobuf_g(R4), R5 |
| MOVV 0(R5), R0 // make sure g != nil |
| JMP gogo<>(SB) |
| |
| TEXT gogo<>(SB), NOSPLIT|NOFRAME, $0 |
| MOVV R5, g |
| JAL runtime·save_g(SB) |
| |
| MOVV gobuf_sp(R4), R3 |
| MOVV gobuf_lr(R4), R1 |
| MOVV gobuf_ret(R4), R19 |
| MOVV gobuf_ctxt(R4), REGCTXT |
| MOVV R0, gobuf_sp(R4) |
| MOVV R0, gobuf_ret(R4) |
| MOVV R0, gobuf_lr(R4) |
| MOVV R0, gobuf_ctxt(R4) |
| MOVV gobuf_pc(R4), R6 |
| JMP (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(SB), NOSPLIT|NOFRAME, $0-8 |
| // Save caller state in g->sched |
| MOVV R3, (g_sched+gobuf_sp)(g) |
| MOVV R1, (g_sched+gobuf_pc)(g) |
| MOVV R0, (g_sched+gobuf_lr)(g) |
| MOVV g, (g_sched+gobuf_g)(g) |
| |
| // Switch to m->g0 & its stack, call fn. |
| MOVV g, R19 |
| MOVV g_m(g), R4 |
| MOVV m_g0(R4), g |
| JAL runtime·save_g(SB) |
| BNE g, R19, 2(PC) |
| JMP runtime·badmcall(SB) |
| MOVV fn+0(FP), REGCTXT // context |
| MOVV 0(REGCTXT), R5 // code pointer |
| MOVV (g_sched+gobuf_sp)(g), R3 // sp = m->g0->sched.sp |
| ADDV $-16, R3 |
| MOVV R19, 8(R3) |
| MOVV R0, 0(R3) |
| JAL (R5) |
| JMP 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 |
| JAL (R1) // make sure this function is not leaf |
| RET |
| |
| // func systemstack(fn func()) |
| TEXT runtime·systemstack(SB), NOSPLIT, $0-8 |
| MOVV fn+0(FP), R19 // R19 = fn |
| MOVV R19, REGCTXT // context |
| MOVV g_m(g), R4 // R4 = m |
| |
| MOVV m_gsignal(R4), R5 // R5 = gsignal |
| BEQ g, R5, noswitch |
| |
| MOVV m_g0(R4), R5 // R5 = g0 |
| BEQ g, R5, noswitch |
| |
| MOVV m_curg(R4), R6 |
| BEQ g, R6, switch |
| |
| // Bad: g is not gsignal, not g0, not curg. What is it? |
| // Hide call from linker nosplit analysis. |
| MOVV $runtime·badsystemstack(SB), R7 |
| JAL (R7) |
| JAL runtime·abort(SB) |
| |
| switch: |
| // save our state in g->sched. Pretend to |
| // be systemstack_switch if the G stack is scanned. |
| JAL gosave_systemstack_switch<>(SB) |
| |
| // switch to g0 |
| MOVV R5, g |
| JAL runtime·save_g(SB) |
| MOVV (g_sched+gobuf_sp)(g), R19 |
| // make it look like mstart called systemstack on g0, to stop traceback |
| ADDV $-8, R19 |
| MOVV $runtime·mstart(SB), R6 |
| MOVV R6, 0(R19) |
| MOVV R19, R3 |
| |
| // call target function |
| MOVV 0(REGCTXT), R6 // code pointer |
| JAL (R6) |
| |
| // switch back to g |
| MOVV g_m(g), R4 |
| MOVV m_curg(R4), g |
| JAL runtime·save_g(SB) |
| MOVV (g_sched+gobuf_sp)(g), R3 |
| MOVV R0, (g_sched+gobuf_sp)(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. |
| MOVV 0(REGCTXT), R4 // code pointer |
| MOVV 0(R3), R1 // restore LR |
| ADDV $8, R3 |
| JMP (R4) |
| |
| /* |
| * support for morestack |
| */ |
| |
| // Called during function prolog when more stack is needed. |
| // Caller has already loaded: |
| // loong64: R5: LR |
| // |
| // 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). |
| MOVV g_m(g), R7 |
| MOVV m_g0(R7), R8 |
| BNE g, R8, 3(PC) |
| JAL runtime·badmorestackg0(SB) |
| JAL runtime·abort(SB) |
| |
| // Cannot grow signal stack (m->gsignal). |
| MOVV m_gsignal(R7), R8 |
| BNE g, R8, 3(PC) |
| JAL runtime·badmorestackgsignal(SB) |
| JAL runtime·abort(SB) |
| |
| // Called from f. |
| // Set g->sched to context in f. |
| MOVV R3, (g_sched+gobuf_sp)(g) |
| MOVV R1, (g_sched+gobuf_pc)(g) |
| MOVV R5, (g_sched+gobuf_lr)(g) |
| MOVV REGCTXT, (g_sched+gobuf_ctxt)(g) |
| |
| // Called from f. |
| // Set m->morebuf to f's caller. |
| MOVV R5, (m_morebuf+gobuf_pc)(R7) // f's caller's PC |
| MOVV R3, (m_morebuf+gobuf_sp)(R7) // f's caller's SP |
| MOVV g, (m_morebuf+gobuf_g)(R7) |
| |
| // Call newstack on m->g0's stack. |
| MOVV m_g0(R7), g |
| JAL runtime·save_g(SB) |
| MOVV (g_sched+gobuf_sp)(g), R3 |
| // Create a stack frame on g0 to call newstack. |
| MOVV R0, -8(R3) // Zero saved LR in frame |
| ADDV $-8, R3 |
| JAL 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 |
| MOVV R0, REGCTXT |
| JMP runtime·morestack(SB) |
| |
| // reflectcall: call a function with the given argument list |
| // func call(argtype *_type, f *FuncVal, arg *byte, argsize, retoffset uint32). |
| // 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) \ |
| MOVV $MAXSIZE, R30; \ |
| SGTU R19, R30, R30; \ |
| BNE R30, 3(PC); \ |
| MOVV $NAME(SB), R4; \ |
| JMP (R4) |
| // Note: can't just "BR NAME(SB)" - bad inlining results. |
| |
| TEXT ·reflectcall(SB), NOSPLIT|NOFRAME, $0-48 |
| MOVWU stackArgsSize+24(FP), R19 |
| 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) |
| MOVV $runtime·badreflectcall(SB), R4 |
| JMP (R4) |
| |
| #define CALLFN(NAME,MAXSIZE) \ |
| TEXT NAME(SB), WRAPPER, $MAXSIZE-24; \ |
| NO_LOCAL_POINTERS; \ |
| /* copy arguments to stack */ \ |
| MOVV arg+16(FP), R4; \ |
| MOVWU argsize+24(FP), R5; \ |
| MOVV R3, R12; \ |
| ADDV $8, R12; \ |
| ADDV R12, R5; \ |
| BEQ R12, R5, 6(PC); \ |
| MOVBU (R4), R6; \ |
| ADDV $1, R4; \ |
| MOVBU R6, (R12); \ |
| ADDV $1, R12; \ |
| JMP -5(PC); \ |
| /* call function */ \ |
| MOVV f+8(FP), REGCTXT; \ |
| MOVV (REGCTXT), R6; \ |
| PCDATA $PCDATA_StackMapIndex, $0; \ |
| JAL (R6); \ |
| /* copy return values back */ \ |
| MOVV argtype+0(FP), R7; \ |
| MOVV arg+16(FP), R4; \ |
| MOVWU n+24(FP), R5; \ |
| MOVWU retoffset+28(FP), R6; \ |
| ADDV $8, R3, R12; \ |
| ADDV R6, R12; \ |
| ADDV R6, R4; \ |
| SUBVU R6, R5; \ |
| JAL 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, $32-0 |
| MOVV R7, 8(R3) |
| MOVV R4, 16(R3) |
| MOVV R12, 24(R3) |
| MOVV R5, 32(R3) |
| JAL 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) |
| |
| TEXT runtime·procyield(SB),NOSPLIT,$0-0 |
| 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 R19. |
| TEXT gosave_systemstack_switch<>(SB),NOSPLIT|NOFRAME,$0 |
| MOVV $runtime·systemstack_switch(SB), R19 |
| ADDV $8, R19 |
| MOVV R19, (g_sched+gobuf_pc)(g) |
| MOVV R3, (g_sched+gobuf_sp)(g) |
| MOVV R0, (g_sched+gobuf_lr)(g) |
| MOVV R0, (g_sched+gobuf_ret)(g) |
| // Assert ctxt is zero. See func save. |
| MOVV (g_sched+gobuf_ctxt)(g), R19 |
| BEQ R19, 2(PC) |
| JAL runtime·abort(SB) |
| 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 |
| MOVV fn+0(FP), R25 |
| MOVV arg+8(FP), R4 |
| |
| MOVV R3, R12 // save original stack pointer |
| MOVV g, R13 |
| |
| // 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. |
| MOVV g_m(g), R5 |
| MOVV m_gsignal(R5), R6 |
| BEQ R6, g, g0 |
| MOVV m_g0(R5), R6 |
| BEQ R6, g, g0 |
| |
| JAL gosave_systemstack_switch<>(SB) |
| MOVV R6, g |
| JAL runtime·save_g(SB) |
| MOVV (g_sched+gobuf_sp)(g), R3 |
| |
| // Now on a scheduling stack (a pthread-created stack). |
| g0: |
| // Save room for two of our pointers. |
| ADDV $-16, R3 |
| MOVV R13, 0(R3) // save old g on stack |
| MOVV (g_stack+stack_hi)(R13), R13 |
| SUBVU R12, R13 |
| MOVV R13, 8(R3) // save depth in old g stack (can't just save SP, as stack might be copied during a callback) |
| JAL (R25) |
| |
| // Restore g, stack pointer. R4 is return value. |
| MOVV 0(R3), g |
| JAL runtime·save_g(SB) |
| MOVV (g_stack+stack_hi)(g), R5 |
| MOVV 8(R3), R6 |
| SUBVU R6, R5 |
| MOVV R5, R3 |
| |
| MOVW R4, ret+16(FP) |
| RET |
| |
| // func cgocallback(fn, frame unsafe.Pointer, ctxt uintptr) |
| // See cgocall.go for more details. |
| TEXT ·cgocallback(SB),NOSPLIT,$24-24 |
| NO_LOCAL_POINTERS |
| |
| // Load m and g from thread-local storage. |
| MOVB runtime·iscgo(SB), R19 |
| BEQ R19, nocgo |
| JAL runtime·load_g(SB) |
| nocgo: |
| |
| // If g is nil, Go did not create the current thread. |
| // 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. |
| BEQ g, needm |
| |
| MOVV g_m(g), R12 |
| MOVV R12, savedm-8(SP) |
| JMP havem |
| |
| needm: |
| MOVV g, savedm-8(SP) // g is zero, so is m. |
| MOVV $runtime·needm(SB), R4 |
| JAL (R4) |
| |
| // Set m->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. |
| MOVV g_m(g), R12 |
| MOVV m_g0(R12), R19 |
| MOVV R3, (g_sched+gobuf_sp)(R19) |
| |
| 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 8(R29) aka savedsp-16(SP). |
| MOVV m_g0(R12), R19 |
| MOVV (g_sched+gobuf_sp)(R19), R13 |
| MOVV R13, savedsp-24(SP) // must match frame size |
| MOVV R3, (g_sched+gobuf_sp)(R19) |
| |
| // 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 stack. |
| // This has the added benefit that it looks to the traceback |
| // routine like cgocallbackg is going to return to that |
| // PC (because the frame we allocate below has the same |
| // size as cgocallback_gofunc's frame declared above) |
| // so that the traceback will seamlessly trace back into |
| // the earlier calls. |
| MOVV m_curg(R12), g |
| JAL runtime·save_g(SB) |
| MOVV (g_sched+gobuf_sp)(g), R13 // prepare stack as R13 |
| MOVV (g_sched+gobuf_pc)(g), R4 |
| MOVV R4, -(24+8)(R13) // "saved LR"; must match frame size |
| MOVV fn+0(FP), R5 |
| MOVV frame+8(FP), R6 |
| MOVV ctxt+16(FP), R7 |
| MOVV $-(24+8)(R13), R3 |
| MOVV R5, 8(R3) |
| MOVV R6, 16(R3) |
| MOVV R7, 24(R3) |
| JAL runtime·cgocallbackg(SB) |
| |
| // Restore g->sched (== m->curg->sched) from saved values. |
| MOVV 0(R3), R4 |
| MOVV R4, (g_sched+gobuf_pc)(g) |
| MOVV $(24+8)(R3), R13 // must match frame size |
| MOVV R13, (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.) |
| MOVV g_m(g), R12 |
| MOVV m_g0(R12), g |
| JAL runtime·save_g(SB) |
| MOVV (g_sched+gobuf_sp)(g), R3 |
| MOVV savedsp-24(SP), R13 // must match frame size |
| MOVV R13, (g_sched+gobuf_sp)(g) |
| |
| // If the m on entry was nil, we called needm above to borrow an m |
| // for the duration of the call. Since the call is over, return it with dropm. |
| MOVV savedm-8(SP), R12 |
| BNE R12, droppedm |
| MOVV $runtime·dropm(SB), R4 |
| JAL (R4) |
| droppedm: |
| |
| // Done! |
| RET |
| |
| // void setg(G*); set g. for use by needm. |
| TEXT runtime·setg(SB), NOSPLIT, $0-8 |
| MOVV gg+0(FP), g |
| // This only happens if iscgo, so jump straight to save_g |
| JAL runtime·save_g(SB) |
| RET |
| |
| // void setg_gcc(G*); set g called from gcc with g in R19 |
| TEXT setg_gcc<>(SB),NOSPLIT,$0-0 |
| MOVV R19, g |
| JAL runtime·save_g(SB) |
| RET |
| |
| TEXT runtime·abort(SB),NOSPLIT|NOFRAME,$0-0 |
| MOVW (R0), R0 |
| UNDEF |
| |
| // AES hashing not implemented for loong64 |
| TEXT runtime·memhash(SB),NOSPLIT|NOFRAME,$0-32 |
| JMP runtime·memhashFallback(SB) |
| TEXT runtime·strhash(SB),NOSPLIT|NOFRAME,$0-24 |
| JMP runtime·strhashFallback(SB) |
| TEXT runtime·memhash32(SB),NOSPLIT|NOFRAME,$0-24 |
| JMP runtime·memhash32Fallback(SB) |
| TEXT runtime·memhash64(SB),NOSPLIT|NOFRAME,$0-24 |
| JMP runtime·memhash64Fallback(SB) |
| |
| TEXT runtime·return0(SB), NOSPLIT, $0 |
| MOVW $0, R19 |
| RET |
| |
| // Called from cgo wrappers, this function returns g->m->curg.stack.hi. |
| // Must obey the gcc calling convention. |
| TEXT _cgo_topofstack(SB),NOSPLIT,$16 |
| // g (R22) and REGTMP (R30) might be clobbered by load_g. They |
| // are callee-save in the gcc calling convention, so save them. |
| MOVV R30, savedREGTMP-16(SP) |
| MOVV g, savedG-8(SP) |
| |
| JAL runtime·load_g(SB) |
| MOVV g_m(g), R19 |
| MOVV m_curg(R19), R19 |
| MOVV (g_stack+stack_hi)(R19), R4 // return value in R4 |
| |
| MOVV savedG-8(SP), g |
| MOVV savedREGTMP-16(SP), R30 |
| RET |
| |
| // The top-most function running on a goroutine |
| // returns to goexit+PCQuantum. |
| TEXT runtime·goexit(SB),NOSPLIT|NOFRAME|TOPFRAME,$0-0 |
| NOR R0, R0 // NOP |
| JAL runtime·goexit1(SB) // does not return |
| // traceback from goexit1 must hit code range of goexit |
| NOR R0, R0 // NOP |
| |
| TEXT ·checkASM(SB),NOSPLIT,$0-1 |
| MOVW $1, R19 |
| MOVB R19, ret+0(FP) |
| RET |
| |
| // gcWriteBarrier performs a heap pointer write and informs the GC. |
| // |
| // gcWriteBarrier does NOT follow the Go ABI. It takes two arguments: |
| // - R27 is the destination of the write |
| // - R28 is the value being written at R27. |
| // It clobbers R30 (the linker temp register). |
| // The act of CALLing gcWriteBarrier will clobber R1 (LR). |
| // It does not clobber any other general-purpose registers, |
| // but may clobber others (e.g., floating point registers). |
| TEXT runtime·gcWriteBarrier(SB),NOSPLIT,$216 |
| // Save the registers clobbered by the fast path. |
| MOVV R19, 208(R3) |
| MOVV R13, 216(R3) |
| MOVV g_m(g), R19 |
| MOVV m_p(R19), R19 |
| MOVV (p_wbBuf+wbBuf_next)(R19), R13 |
| // Increment wbBuf.next position. |
| ADDV $16, R13 |
| MOVV R13, (p_wbBuf+wbBuf_next)(R19) |
| MOVV (p_wbBuf+wbBuf_end)(R19), R19 |
| MOVV R19, R30 // R30 is linker temp register |
| // Record the write. |
| MOVV R28, -16(R13) // Record value |
| MOVV (R27), R19 // TODO: This turns bad writes into bad reads. |
| MOVV R19, -8(R13) // Record *slot |
| // Is the buffer full? |
| BEQ R13, R30, flush |
| ret: |
| MOVV 208(R3), R19 |
| MOVV 216(R3), R13 |
| // Do the write. |
| MOVV R28, (R27) |
| RET |
| |
| flush: |
| // Save all general purpose registers since these could be |
| // clobbered by wbBufFlush and were not saved by the caller. |
| MOVV R27, 8(R3) // Also first argument to wbBufFlush |
| MOVV R28, 16(R3) // Also second argument to wbBufFlush |
| // R1 is LR, which was saved by the prologue. |
| MOVV R2, 24(R3) |
| // R3 is SP. |
| MOVV R4, 32(R3) |
| MOVV R5, 40(R3) |
| MOVV R6, 48(R3) |
| MOVV R7, 56(R3) |
| MOVV R8, 64(R3) |
| MOVV R9, 72(R3) |
| MOVV R10, 80(R3) |
| MOVV R11, 88(R3) |
| MOVV R12, 96(R3) |
| // R13 already saved |
| MOVV R14, 104(R3) |
| MOVV R15, 112(R3) |
| MOVV R16, 120(R3) |
| MOVV R17, 128(R3) |
| MOVV R18, 136(R3) |
| // R19 already saved |
| MOVV R20, 144(R3) |
| MOVV R21, 152(R3) |
| // R22 is g. |
| MOVV R23, 160(R3) |
| MOVV R24, 168(R3) |
| MOVV R25, 176(R3) |
| MOVV R26, 184(R3) |
| // R27 already saved |
| // R28 already saved. |
| MOVV R29, 192(R3) |
| // R30 is tmp register. |
| MOVV R31, 200(R3) |
| |
| |
| // This takes arguments R27 and R28. |
| CALL runtime·wbBufFlush(SB) |
| |
| MOVV 8(R3), R27 |
| MOVV 16(R3), R28 |
| MOVV 24(R3), R2 |
| MOVV 32(R3), R4 |
| MOVV 40(R3), R5 |
| MOVV 48(R3), R6 |
| MOVV 56(R3), R7 |
| MOVV 64(R3), R8 |
| MOVV 72(R3), R9 |
| MOVV 80(R3), R10 |
| MOVV 88(R3), R11 |
| MOVV 96(R3), R12 |
| MOVV 104(R3), R14 |
| MOVV 112(R3), R15 |
| MOVV 120(R3), R16 |
| MOVV 128(R3), R17 |
| MOVV 136(R3), R18 |
| MOVV 144(R3), R20 |
| MOVV 152(R3), R21 |
| MOVV 160(R3), R23 |
| MOVV 168(R3), R24 |
| MOVV 176(R3), R25 |
| MOVV 184(R3), R26 |
| MOVV 192(R3), R29 |
| MOVV 200(R3), R31 |
| JMP 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. |
| TEXT runtime·panicIndex(SB),NOSPLIT,$0-16 |
| MOVV R19, x+0(FP) |
| MOVV R18, y+8(FP) |
| JMP runtime·goPanicIndex(SB) |
| TEXT runtime·panicIndexU(SB),NOSPLIT,$0-16 |
| MOVV R19, x+0(FP) |
| MOVV R18, y+8(FP) |
| JMP runtime·goPanicIndexU(SB) |
| TEXT runtime·panicSliceAlen(SB),NOSPLIT,$0-16 |
| MOVV R18, x+0(FP) |
| MOVV R17, y+8(FP) |
| JMP runtime·goPanicSliceAlen(SB) |
| TEXT runtime·panicSliceAlenU(SB),NOSPLIT,$0-16 |
| MOVV R18, x+0(FP) |
| MOVV R17, y+8(FP) |
| JMP runtime·goPanicSliceAlenU(SB) |
| TEXT runtime·panicSliceAcap(SB),NOSPLIT,$0-16 |
| MOVV R18, x+0(FP) |
| MOVV R17, y+8(FP) |
| JMP runtime·goPanicSliceAcap(SB) |
| TEXT runtime·panicSliceAcapU(SB),NOSPLIT,$0-16 |
| MOVV R18, x+0(FP) |
| MOVV R17, y+8(FP) |
| JMP runtime·goPanicSliceAcapU(SB) |
| TEXT runtime·panicSliceB(SB),NOSPLIT,$0-16 |
| MOVV R19, x+0(FP) |
| MOVV R18, y+8(FP) |
| JMP runtime·goPanicSliceB(SB) |
| TEXT runtime·panicSliceBU(SB),NOSPLIT,$0-16 |
| MOVV R19, x+0(FP) |
| MOVV R18, y+8(FP) |
| JMP runtime·goPanicSliceBU(SB) |
| TEXT runtime·panicSlice3Alen(SB),NOSPLIT,$0-16 |
| MOVV R17, x+0(FP) |
| MOVV R4, y+8(FP) |
| JMP runtime·goPanicSlice3Alen(SB) |
| TEXT runtime·panicSlice3AlenU(SB),NOSPLIT,$0-16 |
| MOVV R17, x+0(FP) |
| MOVV R4, y+8(FP) |
| JMP runtime·goPanicSlice3AlenU(SB) |
| TEXT runtime·panicSlice3Acap(SB),NOSPLIT,$0-16 |
| MOVV R17, x+0(FP) |
| MOVV R4, y+8(FP) |
| JMP runtime·goPanicSlice3Acap(SB) |
| TEXT runtime·panicSlice3AcapU(SB),NOSPLIT,$0-16 |
| MOVV R17, x+0(FP) |
| MOVV R4, y+8(FP) |
| JMP runtime·goPanicSlice3AcapU(SB) |
| TEXT runtime·panicSlice3B(SB),NOSPLIT,$0-16 |
| MOVV R18, x+0(FP) |
| MOVV R17, y+8(FP) |
| JMP runtime·goPanicSlice3B(SB) |
| TEXT runtime·panicSlice3BU(SB),NOSPLIT,$0-16 |
| MOVV R18, x+0(FP) |
| MOVV R17, y+8(FP) |
| JMP runtime·goPanicSlice3BU(SB) |
| TEXT runtime·panicSlice3C(SB),NOSPLIT,$0-16 |
| MOVV R19, x+0(FP) |
| MOVV R18, y+8(FP) |
| JMP runtime·goPanicSlice3C(SB) |
| TEXT runtime·panicSlice3CU(SB),NOSPLIT,$0-16 |
| MOVV R19, x+0(FP) |
| MOVV R18, y+8(FP) |
| JMP runtime·goPanicSlice3CU(SB) |
| TEXT runtime·panicSliceConvert(SB),NOSPLIT,$0-16 |
| MOVV R17, x+0(FP) |
| MOVV R4, y+8(FP) |
| JMP runtime·goPanicSliceConvert(SB) |
