// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ppc64 ppc64le
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#include "go_asm.h"
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#include "go_tls.h"
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#include "funcdata.h"
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#include "textflag.h"
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#include "asm_ppc64x.h"
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TEXT runtime·rt0_go(SB),NOSPLIT,$0
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// R1 = stack; R3 = argc; R4 = argv; R13 = C TLS base pointer
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// initialize essential registers
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BL runtime·reginit(SB)
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SUB $(FIXED_FRAME+16), R1
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MOVD R2, 24(R1) // stash the TOC pointer away again now we've created a new frame
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MOVW R3, FIXED_FRAME+0(R1) // argc
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MOVD R4, FIXED_FRAME+8(R1) // argv
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// create istack out of the given (operating system) stack.
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// _cgo_init may update stackguard.
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MOVD $runtime·g0(SB), g
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BL runtime·save_g(SB)
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MOVD $(-64*1024), R31
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ADD R31, R1, R3
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MOVD R3, g_stackguard0(g)
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MOVD R3, g_stackguard1(g)
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MOVD R3, (g_stack+stack_lo)(g)
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MOVD R1, (g_stack+stack_hi)(g)
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// if there is a _cgo_init, call it using the gcc ABI.
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MOVD _cgo_init(SB), R12
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CMP R0, R12
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BEQ nocgo
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#ifdef GOARCH_ppc64
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// ppc64 use elf ABI v1. we must get the real entry address from
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// first slot of the function descriptor before call.
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MOVD 8(R12), R2
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MOVD (R12), R12
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#endif
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MOVD R12, CTR // r12 = "global function entry point"
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MOVD R13, R5 // arg 2: TLS base pointer
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MOVD $setg_gcc<>(SB), R4 // arg 1: setg
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MOVD g, R3 // arg 0: G
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// C functions expect 32 bytes of space on caller stack frame
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// and a 16-byte aligned R1
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MOVD R1, R14 // save current stack
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SUB $32, R1 // reserve 32 bytes
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RLDCR $0, R1, $~15, R1 // 16-byte align
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BL (CTR) // may clobber R0, R3-R12
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MOVD R14, R1 // restore stack
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MOVD 24(R1), R2
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XOR R0, R0 // fix R0
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nocgo:
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// update stackguard after _cgo_init
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MOVD (g_stack+stack_lo)(g), R3
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ADD $const__StackGuard, R3
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MOVD R3, g_stackguard0(g)
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MOVD R3, g_stackguard1(g)
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// set the per-goroutine and per-mach "registers"
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MOVD $runtime·m0(SB), R3
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// save m->g0 = g0
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MOVD g, m_g0(R3)
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// save m0 to g0->m
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MOVD R3, g_m(g)
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BL runtime·check(SB)
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// args are already prepared
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BL runtime·args(SB)
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BL runtime·osinit(SB)
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BL runtime·schedinit(SB)
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// create a new goroutine to start program
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MOVD $runtime·mainPC(SB), R3 // entry
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MOVDU R3, -8(R1)
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MOVDU R0, -8(R1)
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MOVDU R0, -8(R1)
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MOVDU R0, -8(R1)
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MOVDU R0, -8(R1)
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MOVDU R0, -8(R1)
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BL runtime·newproc(SB)
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ADD $(16+FIXED_FRAME), R1
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// start this M
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BL runtime·mstart(SB)
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MOVD R0, 0(R0)
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RET
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DATA runtime·mainPC+0(SB)/8,$runtime·main(SB)
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GLOBL runtime·mainPC(SB),RODATA,$8
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TEXT runtime·breakpoint(SB),NOSPLIT|NOFRAME,$0-0
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MOVD R0, 0(R0) // TODO: TD
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RET
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TEXT runtime·asminit(SB),NOSPLIT|NOFRAME,$0-0
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RET
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TEXT _cgo_reginit(SB),NOSPLIT|NOFRAME,$0-0
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// crosscall_ppc64 and crosscall2 need to reginit, but can't
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// get at the 'runtime.reginit' symbol.
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BR runtime·reginit(SB)
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TEXT runtime·reginit(SB),NOSPLIT|NOFRAME,$0-0
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// set R0 to zero, it's expected by the toolchain
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XOR R0, R0
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RET
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/*
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* go-routine
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*/
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// void gosave(Gobuf*)
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// save state in Gobuf; setjmp
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TEXT runtime·gosave(SB), NOSPLIT|NOFRAME, $0-8
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MOVD buf+0(FP), R3
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MOVD R1, gobuf_sp(R3)
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MOVD LR, R31
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MOVD R31, gobuf_pc(R3)
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MOVD g, gobuf_g(R3)
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MOVD R0, gobuf_lr(R3)
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MOVD R0, gobuf_ret(R3)
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// Assert ctxt is zero. See func save.
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MOVD gobuf_ctxt(R3), R3
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CMP R0, R3
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BEQ 2(PC)
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BL runtime·badctxt(SB)
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RET
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// void gogo(Gobuf*)
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// restore state from Gobuf; longjmp
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TEXT runtime·gogo(SB), NOSPLIT, $16-8
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MOVD buf+0(FP), R5
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MOVD gobuf_g(R5), g // make sure g is not nil
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BL runtime·save_g(SB)
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MOVD 0(g), R4
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MOVD gobuf_sp(R5), R1
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MOVD gobuf_lr(R5), R31
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#ifndef GOOS_aix
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MOVD 24(R1), R2 // restore R2
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#endif
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MOVD R31, LR
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MOVD gobuf_ret(R5), R3
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MOVD gobuf_ctxt(R5), R11
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MOVD R0, gobuf_sp(R5)
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MOVD R0, gobuf_ret(R5)
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MOVD R0, gobuf_lr(R5)
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MOVD R0, gobuf_ctxt(R5)
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CMP R0, R0 // set condition codes for == test, needed by stack split
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MOVD gobuf_pc(R5), R12
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MOVD R12, CTR
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BR (CTR)
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// void mcall(fn func(*g))
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// Switch to m->g0's stack, call fn(g).
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// Fn must never return. It should gogo(&g->sched)
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// to keep running g.
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TEXT runtime·mcall(SB), NOSPLIT|NOFRAME, $0-8
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// Save caller state in g->sched
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MOVD R1, (g_sched+gobuf_sp)(g)
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MOVD LR, R31
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MOVD R31, (g_sched+gobuf_pc)(g)
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MOVD R0, (g_sched+gobuf_lr)(g)
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MOVD g, (g_sched+gobuf_g)(g)
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// Switch to m->g0 & its stack, call fn.
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MOVD g, R3
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MOVD g_m(g), R8
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MOVD m_g0(R8), g
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BL runtime·save_g(SB)
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CMP g, R3
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BNE 2(PC)
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BR runtime·badmcall(SB)
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MOVD fn+0(FP), R11 // context
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MOVD 0(R11), R12 // code pointer
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MOVD R12, CTR
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MOVD (g_sched+gobuf_sp)(g), R1 // sp = m->g0->sched.sp
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MOVDU R3, -8(R1)
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MOVDU R0, -8(R1)
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MOVDU R0, -8(R1)
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MOVDU R0, -8(R1)
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MOVDU R0, -8(R1)
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BL (CTR)
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MOVD 24(R1), R2
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BR runtime·badmcall2(SB)
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// systemstack_switch is a dummy routine that systemstack leaves at the bottom
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// of the G stack. We need to distinguish the routine that
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// lives at the bottom of the G stack from the one that lives
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// at the top of the system stack because the one at the top of
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// the system stack terminates the stack walk (see topofstack()).
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TEXT runtime·systemstack_switch(SB), NOSPLIT, $0-0
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// We have several undefs here so that 16 bytes past
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// $runtime·systemstack_switch lies within them whether or not the
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// instructions that derive r2 from r12 are there.
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UNDEF
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UNDEF
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UNDEF
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BL (LR) // make sure this function is not leaf
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RET
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// func systemstack(fn func())
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TEXT runtime·systemstack(SB), NOSPLIT, $0-8
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MOVD fn+0(FP), R3 // R3 = fn
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MOVD R3, R11 // context
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MOVD g_m(g), R4 // R4 = m
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MOVD m_gsignal(R4), R5 // R5 = gsignal
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CMP g, R5
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BEQ noswitch
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MOVD m_g0(R4), R5 // R5 = g0
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CMP g, R5
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BEQ noswitch
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MOVD m_curg(R4), R6
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CMP g, R6
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BEQ switch
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// Bad: g is not gsignal, not g0, not curg. What is it?
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// Hide call from linker nosplit analysis.
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MOVD $runtime·badsystemstack(SB), R12
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MOVD R12, CTR
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BL (CTR)
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BL runtime·abort(SB)
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switch:
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// save our state in g->sched. Pretend to
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// be systemstack_switch if the G stack is scanned.
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MOVD $runtime·systemstack_switch(SB), R6
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ADD $16, R6 // get past prologue (including r2-setting instructions when they're there)
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MOVD R6, (g_sched+gobuf_pc)(g)
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MOVD R1, (g_sched+gobuf_sp)(g)
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MOVD R0, (g_sched+gobuf_lr)(g)
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MOVD g, (g_sched+gobuf_g)(g)
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// switch to g0
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MOVD R5, g
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BL runtime·save_g(SB)
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MOVD (g_sched+gobuf_sp)(g), R3
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// make it look like mstart called systemstack on g0, to stop traceback
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SUB $FIXED_FRAME, R3
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MOVD $runtime·mstart(SB), R4
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MOVD R4, 0(R3)
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MOVD R3, R1
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// call target function
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MOVD 0(R11), R12 // code pointer
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MOVD R12, CTR
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BL (CTR)
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// restore TOC pointer. It seems unlikely that we will use systemstack
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// to call a function defined in another module, but the results of
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// doing so would be so confusing that it's worth doing this.
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MOVD g_m(g), R3
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MOVD m_curg(R3), g
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MOVD (g_sched+gobuf_sp)(g), R3
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#ifndef GOOS_aix
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MOVD 24(R3), R2
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#endif
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// switch back to g
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MOVD g_m(g), R3
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MOVD m_curg(R3), g
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BL runtime·save_g(SB)
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MOVD (g_sched+gobuf_sp)(g), R1
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MOVD R0, (g_sched+gobuf_sp)(g)
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RET
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noswitch:
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// already on m stack, just call directly
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// On other arches we do a tail call here, but it appears to be
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// impossible to tail call a function pointer in shared mode on
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// ppc64 because the caller is responsible for restoring the TOC.
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MOVD 0(R11), R12 // code pointer
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MOVD R12, CTR
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BL (CTR)
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#ifndef GOOS_aix
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MOVD 24(R1), R2
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#endif
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RET
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/*
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* support for morestack
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*/
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// Called during function prolog when more stack is needed.
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// Caller has already loaded:
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// R3: framesize, R4: argsize, R5: LR
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//
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// The traceback routines see morestack on a g0 as being
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// the top of a stack (for example, morestack calling newstack
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// calling the scheduler calling newm calling gc), so we must
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// record an argument size. For that purpose, it has no arguments.
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TEXT runtime·morestack(SB),NOSPLIT|NOFRAME,$0-0
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// Cannot grow scheduler stack (m->g0).
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MOVD g_m(g), R7
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MOVD m_g0(R7), R8
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CMP g, R8
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BNE 3(PC)
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BL runtime·badmorestackg0(SB)
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BL runtime·abort(SB)
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// Cannot grow signal stack (m->gsignal).
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MOVD m_gsignal(R7), R8
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CMP g, R8
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BNE 3(PC)
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BL runtime·badmorestackgsignal(SB)
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BL runtime·abort(SB)
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// Called from f.
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// Set g->sched to context in f.
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MOVD R1, (g_sched+gobuf_sp)(g)
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MOVD LR, R8
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MOVD R8, (g_sched+gobuf_pc)(g)
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MOVD R5, (g_sched+gobuf_lr)(g)
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MOVD R11, (g_sched+gobuf_ctxt)(g)
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// Called from f.
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// Set m->morebuf to f's caller.
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MOVD R5, (m_morebuf+gobuf_pc)(R7) // f's caller's PC
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MOVD R1, (m_morebuf+gobuf_sp)(R7) // f's caller's SP
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MOVD g, (m_morebuf+gobuf_g)(R7)
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// Call newstack on m->g0's stack.
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MOVD m_g0(R7), g
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BL runtime·save_g(SB)
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MOVD (g_sched+gobuf_sp)(g), R1
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MOVDU R0, -(FIXED_FRAME+0)(R1) // create a call frame on g0
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BL runtime·newstack(SB)
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// Not reached, but make sure the return PC from the call to newstack
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// is still in this function, and not the beginning of the next.
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UNDEF
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TEXT runtime·morestack_noctxt(SB),NOSPLIT|NOFRAME,$0-0
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MOVD R0, R11
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BR runtime·morestack(SB)
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// reflectcall: call a function with the given argument list
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// func call(argtype *_type, f *FuncVal, arg *byte, argsize, retoffset uint32).
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// we don't have variable-sized frames, so we use a small number
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// of constant-sized-frame functions to encode a few bits of size in the pc.
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// Caution: ugly multiline assembly macros in your future!
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#define DISPATCH(NAME,MAXSIZE) \
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MOVD $MAXSIZE, R31; \
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CMP R3, R31; \
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BGT 4(PC); \
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MOVD $NAME(SB), R12; \
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MOVD R12, CTR; \
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BR (CTR)
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// Note: can't just "BR NAME(SB)" - bad inlining results.
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TEXT ·reflectcall(SB), NOSPLIT|NOFRAME, $0-32
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MOVWZ argsize+24(FP), R3
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DISPATCH(runtime·call32, 32)
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DISPATCH(runtime·call64, 64)
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DISPATCH(runtime·call128, 128)
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DISPATCH(runtime·call256, 256)
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DISPATCH(runtime·call512, 512)
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DISPATCH(runtime·call1024, 1024)
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DISPATCH(runtime·call2048, 2048)
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DISPATCH(runtime·call4096, 4096)
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DISPATCH(runtime·call8192, 8192)
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DISPATCH(runtime·call16384, 16384)
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DISPATCH(runtime·call32768, 32768)
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DISPATCH(runtime·call65536, 65536)
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DISPATCH(runtime·call131072, 131072)
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DISPATCH(runtime·call262144, 262144)
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DISPATCH(runtime·call524288, 524288)
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DISPATCH(runtime·call1048576, 1048576)
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DISPATCH(runtime·call2097152, 2097152)
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DISPATCH(runtime·call4194304, 4194304)
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DISPATCH(runtime·call8388608, 8388608)
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DISPATCH(runtime·call16777216, 16777216)
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DISPATCH(runtime·call33554432, 33554432)
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DISPATCH(runtime·call67108864, 67108864)
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DISPATCH(runtime·call134217728, 134217728)
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DISPATCH(runtime·call268435456, 268435456)
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DISPATCH(runtime·call536870912, 536870912)
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DISPATCH(runtime·call1073741824, 1073741824)
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MOVD $runtime·badreflectcall(SB), R12
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MOVD R12, CTR
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BR (CTR)
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#define CALLFN(NAME,MAXSIZE) \
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TEXT NAME(SB), WRAPPER, $MAXSIZE-24; \
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NO_LOCAL_POINTERS; \
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/* copy arguments to stack */ \
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MOVD arg+16(FP), R3; \
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MOVWZ argsize+24(FP), R4; \
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MOVD R1, R5; \
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CMP R4, $8; \
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BLT tailsetup; \
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/* copy 8 at a time if possible */ \
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ADD $(FIXED_FRAME-8), R5; \
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SUB $8, R3; \
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top: \
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MOVDU 8(R3), R7; \
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MOVDU R7, 8(R5); \
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SUB $8, R4; \
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CMP R4, $8; \
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BGE top; \
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/* handle remaining bytes */ \
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CMP $0, R4; \
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BEQ callfn; \
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ADD $7, R3; \
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ADD $7, R5; \
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BR tail; \
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tailsetup: \
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CMP $0, R4; \
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BEQ callfn; \
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ADD $(FIXED_FRAME-1), R5; \
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SUB $1, R3; \
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tail: \
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MOVBU 1(R3), R6; \
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MOVBU R6, 1(R5); \
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SUB $1, R4; \
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CMP $0, R4; \
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BGT tail; \
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callfn: \
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/* call function */ \
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MOVD f+8(FP), R11; \
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#ifdef GOOS_aix \
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/* AIX won't trigger a SIGSEGV if R11 = nil */ \
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/* So it manually triggers it */ \
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CMP R0, R11 \
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BNE 2(PC) \
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MOVD R0, 0(R0) \
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#endif \
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MOVD (R11), R12; \
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MOVD R12, CTR; \
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PCDATA $PCDATA_StackMapIndex, $0; \
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BL (CTR); \
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#ifndef GOOS_aix \
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MOVD 24(R1), R2; \
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#endif \
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/* copy return values back */ \
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MOVD argtype+0(FP), R7; \
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MOVD arg+16(FP), R3; \
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MOVWZ n+24(FP), R4; \
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MOVWZ retoffset+28(FP), R6; \
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ADD $FIXED_FRAME, R1, R5; \
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ADD R6, R5; \
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ADD R6, R3; \
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SUB R6, R4; \
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BL callRet<>(SB); \
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RET
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// callRet copies return values back at the end of call*. This is a
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// separate function so it can allocate stack space for the arguments
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// to reflectcallmove. It does not follow the Go ABI; it expects its
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// arguments in registers.
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TEXT callRet<>(SB), NOSPLIT, $32-0
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MOVD R7, FIXED_FRAME+0(R1)
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MOVD R3, FIXED_FRAME+8(R1)
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MOVD R5, FIXED_FRAME+16(R1)
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MOVD R4, FIXED_FRAME+24(R1)
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BL runtime·reflectcallmove(SB)
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RET
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CALLFN(·call32, 32)
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CALLFN(·call64, 64)
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CALLFN(·call128, 128)
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CALLFN(·call256, 256)
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CALLFN(·call512, 512)
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CALLFN(·call1024, 1024)
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CALLFN(·call2048, 2048)
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CALLFN(·call4096, 4096)
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CALLFN(·call8192, 8192)
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CALLFN(·call16384, 16384)
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CALLFN(·call32768, 32768)
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CALLFN(·call65536, 65536)
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CALLFN(·call131072, 131072)
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CALLFN(·call262144, 262144)
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CALLFN(·call524288, 524288)
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CALLFN(·call1048576, 1048576)
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CALLFN(·call2097152, 2097152)
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CALLFN(·call4194304, 4194304)
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CALLFN(·call8388608, 8388608)
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CALLFN(·call16777216, 16777216)
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CALLFN(·call33554432, 33554432)
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CALLFN(·call67108864, 67108864)
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CALLFN(·call134217728, 134217728)
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CALLFN(·call268435456, 268435456)
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CALLFN(·call536870912, 536870912)
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CALLFN(·call1073741824, 1073741824)
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TEXT runtime·procyield(SB),NOSPLIT|NOFRAME,$0-4
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MOVW cycles+0(FP), R7
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// POWER does not have a pause/yield instruction equivalent.
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// Instead, we can lower the program priority by setting the
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// Program Priority Register prior to the wait loop and set it
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// back to default afterwards. On Linux, the default priority is
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// medium-low. For details, see page 837 of the ISA 3.0.
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OR R1, R1, R1 // Set PPR priority to low
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again:
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SUB $1, R7
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CMP $0, R7
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BNE again
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OR R6, R6, R6 // Set PPR priority back to medium-low
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RET
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// void jmpdefer(fv, sp);
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// called from deferreturn.
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// 1. grab stored LR for caller
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// 2. sub 8 bytes to get back to either nop or toc reload before deferreturn
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// 3. BR to fn
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// When dynamically linking Go, it is not sufficient to rewind to the BL
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// deferreturn -- we might be jumping between modules and so we need to reset
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// the TOC pointer in r2. To do this, codegen inserts MOVD 24(R1), R2 *before*
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// the BL deferreturn and jmpdefer rewinds to that.
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TEXT runtime·jmpdefer(SB), NOSPLIT|NOFRAME, $0-16
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MOVD 0(R1), R31
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SUB $8, R31
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MOVD R31, LR
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MOVD fv+0(FP), R11
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MOVD argp+8(FP), R1
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SUB $FIXED_FRAME, R1
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#ifdef GOOS_aix
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// AIX won't trigger a SIGSEGV if R11 = nil
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// So it manually triggers it
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CMP R0, R11
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BNE 2(PC)
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MOVD R0, 0(R0)
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#endif
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MOVD 0(R11), R12
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MOVD R12, CTR
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BR (CTR)
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// Save state of caller into g->sched. Smashes R31.
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TEXT gosave<>(SB),NOSPLIT|NOFRAME,$0
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MOVD LR, R31
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MOVD R31, (g_sched+gobuf_pc)(g)
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MOVD R1, (g_sched+gobuf_sp)(g)
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MOVD R0, (g_sched+gobuf_lr)(g)
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MOVD R0, (g_sched+gobuf_ret)(g)
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// Assert ctxt is zero. See func save.
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MOVD (g_sched+gobuf_ctxt)(g), R31
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CMP R0, R31
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BEQ 2(PC)
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BL runtime·badctxt(SB)
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RET
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// func asmcgocall(fn, arg unsafe.Pointer) int32
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// Call fn(arg) on the scheduler stack,
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// aligned appropriately for the gcc ABI.
|
// See cgocall.go for more details.
|
TEXT ·asmcgocall(SB),NOSPLIT,$0-20
|
MOVD fn+0(FP), R3
|
MOVD arg+8(FP), R4
|
|
MOVD R1, R7 // save original stack pointer
|
MOVD g, R5
|
|
// 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.
|
// Moreover, if it's called inside the signal handler, it must not switch
|
// to g0 as it can be in use by another syscall.
|
MOVD g_m(g), R8
|
MOVD m_gsignal(R8), R6
|
CMP R6, g
|
BEQ g0
|
MOVD m_g0(R8), R6
|
CMP R6, g
|
BEQ g0
|
BL gosave<>(SB)
|
MOVD R6, g
|
BL runtime·save_g(SB)
|
MOVD (g_sched+gobuf_sp)(g), R1
|
|
// Now on a scheduling stack (a pthread-created stack).
|
g0:
|
// Save room for two of our pointers, plus 32 bytes of callee
|
// save area that lives on the caller stack.
|
#ifdef GOOS_aix
|
// Create a fake LR to improve backtrace.
|
MOVD $runtime·asmcgocall(SB), R6
|
MOVD R6, 16(R1)
|
#endif
|
SUB $48, R1
|
RLDCR $0, R1, $~15, R1 // 16-byte alignment for gcc ABI
|
MOVD R5, 40(R1) // save old g on stack
|
MOVD (g_stack+stack_hi)(R5), R5
|
SUB R7, R5
|
MOVD R5, 32(R1) // save depth in old g stack (can't just save SP, as stack might be copied during a callback)
|
#ifdef GOOS_aix
|
MOVD R7, 0(R1) // Save frame pointer to allow manual backtrace with gdb
|
#else
|
MOVD R0, 0(R1) // clear back chain pointer (TODO can we give it real back trace information?)
|
#endif
|
// This is a "global call", so put the global entry point in r12
|
MOVD R3, R12
|
|
#ifdef GOARCH_ppc64
|
// ppc64 use elf ABI v1. we must get the real entry address from
|
// first slot of the function descriptor before call.
|
#ifndef GOOS_aix
|
// aix just passes the function pointer for the moment, see golang.org/cl/146898 for details.
|
MOVD 8(R12), R2
|
MOVD (R12), R12
|
#endif
|
#endif
|
MOVD R12, CTR
|
MOVD R4, R3 // arg in r3
|
BL (CTR)
|
|
// C code can clobber R0, so set it back to 0. F27-F31 are
|
// callee save, so we don't need to recover those.
|
XOR R0, R0
|
// Restore g, stack pointer, toc pointer.
|
// R3 is errno, so don't touch it
|
MOVD 40(R1), g
|
MOVD (g_stack+stack_hi)(g), R5
|
MOVD 32(R1), R6
|
SUB R6, R5
|
#ifndef GOOS_aix
|
MOVD 24(R5), R2
|
#endif
|
MOVD R5, R1
|
BL runtime·save_g(SB)
|
|
MOVW R3, ret+16(FP)
|
RET
|
|
// cgocallback(void (*fn)(void*), void *frame, uintptr framesize, uintptr ctxt)
|
// Turn the fn into a Go func (by taking its address) and call
|
// cgocallback_gofunc.
|
TEXT runtime·cgocallback(SB),NOSPLIT,$32-32
|
MOVD $fn+0(FP), R3
|
MOVD R3, FIXED_FRAME+0(R1)
|
MOVD frame+8(FP), R3
|
MOVD R3, FIXED_FRAME+8(R1)
|
MOVD framesize+16(FP), R3
|
MOVD R3, FIXED_FRAME+16(R1)
|
MOVD ctxt+24(FP), R3
|
MOVD R3, FIXED_FRAME+24(R1)
|
MOVD $runtime·cgocallback_gofunc(SB), R12
|
MOVD R12, CTR
|
BL (CTR)
|
RET
|
|
// cgocallback_gofunc(FuncVal*, void *frame, uintptr framesize, uintptr ctxt)
|
// See cgocall.go for more details.
|
TEXT ·cgocallback_gofunc(SB),NOSPLIT,$16-32
|
NO_LOCAL_POINTERS
|
|
// Load m and g from thread-local storage.
|
MOVBZ runtime·iscgo(SB), R3
|
CMP R3, $0
|
BEQ nocgo
|
BL 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.
|
CMP g, $0
|
BEQ needm
|
|
MOVD g_m(g), R8
|
MOVD R8, savedm-8(SP)
|
BR havem
|
|
needm:
|
MOVD g, savedm-8(SP) // g is zero, so is m.
|
MOVD $runtime·needm(SB), R12
|
MOVD R12, CTR
|
BL (CTR)
|
|
// 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.
|
MOVD g_m(g), R8
|
MOVD m_g0(R8), R3
|
MOVD R1, (g_sched+gobuf_sp)(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 8(R1) aka savedsp-16(SP).
|
MOVD m_g0(R8), R3
|
MOVD (g_sched+gobuf_sp)(R3), R4
|
MOVD R4, savedsp-16(SP)
|
MOVD R1, (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 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.
|
//
|
// In the new goroutine, -8(SP) is unused (where SP refers to
|
// m->curg's SP while we're setting it up, before we've adjusted it).
|
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, -(FIXED_FRAME+16)(R4)
|
MOVD ctxt+24(FP), R3
|
MOVD R3, -16(R4)
|
MOVD $-(FIXED_FRAME+16)(R4), R1
|
BL runtime·cgocallbackg(SB)
|
|
// Restore g->sched (== m->curg->sched) from saved values.
|
MOVD 0(R1), R5
|
MOVD R5, (g_sched+gobuf_pc)(g)
|
MOVD $(FIXED_FRAME+16)(R1), 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), R1
|
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
|
// for the duration of the call. Since the call is over, return it with dropm.
|
MOVD savedm-8(SP), R6
|
CMP R6, $0
|
BNE droppedm
|
MOVD $runtime·dropm(SB), R12
|
MOVD R12, CTR
|
BL (CTR)
|
droppedm:
|
|
// Done!
|
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
|
|
#ifdef GOARCH_ppc64
|
TEXT setg_gcc<>(SB),NOSPLIT|NOFRAME,$0-0
|
DWORD $_setg_gcc<>(SB)
|
DWORD $0
|
DWORD $0
|
#endif
|
|
// void setg_gcc(G*); set g in C TLS.
|
// Must obey the gcc calling convention.
|
#ifdef GOARCH_ppc64le
|
TEXT setg_gcc<>(SB),NOSPLIT|NOFRAME,$0-0
|
#else
|
TEXT _setg_gcc<>(SB),NOSPLIT|NOFRAME,$0-0
|
#endif
|
// The standard prologue clobbers R31, which is callee-save in
|
// the C ABI, so we have to use $-8-0 and save LR ourselves.
|
MOVD LR, R4
|
// Also save g and R31, since they're callee-save in C ABI
|
MOVD R31, R5
|
MOVD g, R6
|
|
MOVD R3, g
|
BL runtime·save_g(SB)
|
|
MOVD R6, g
|
MOVD R5, R31
|
MOVD R4, LR
|
RET
|
|
TEXT runtime·abort(SB),NOSPLIT|NOFRAME,$0-0
|
MOVW (R0), R0
|
UNDEF
|
|
#define TBR 268
|
|
// int64 runtime·cputicks(void)
|
TEXT runtime·cputicks(SB),NOSPLIT,$0-8
|
MOVD SPR(TBR), R3
|
MOVD R3, ret+0(FP)
|
RET
|
|
// AES hashing not implemented for ppc64
|
TEXT runtime·aeshash(SB),NOSPLIT|NOFRAME,$0-0
|
MOVW (R0), R1
|
TEXT runtime·aeshash32(SB),NOSPLIT|NOFRAME,$0-0
|
MOVW (R0), R1
|
TEXT runtime·aeshash64(SB),NOSPLIT|NOFRAME,$0-0
|
MOVW (R0), R1
|
TEXT runtime·aeshashstr(SB),NOSPLIT|NOFRAME,$0-0
|
MOVW (R0), R1
|
|
TEXT runtime·return0(SB), NOSPLIT, $0
|
MOVW $0, R3
|
RET
|
|
// Called from cgo wrappers, this function returns g->m->curg.stack.hi.
|
// Must obey the gcc calling convention.
|
TEXT _cgo_topofstack(SB),NOSPLIT|NOFRAME,$0
|
// g (R30) and R31 are callee-save in the C ABI, so save them
|
MOVD g, R4
|
MOVD R31, R5
|
MOVD LR, R6
|
|
BL runtime·load_g(SB) // clobbers g (R30), R31
|
MOVD g_m(g), R3
|
MOVD m_curg(R3), R3
|
MOVD (g_stack+stack_hi)(R3), R3
|
|
MOVD R4, g
|
MOVD R5, R31
|
MOVD R6, LR
|
RET
|
|
// The top-most function running on a goroutine
|
// returns to goexit+PCQuantum.
|
//
|
// When dynamically linking Go, it can be returned to from a function
|
// implemented in a different module and so needs to reload the TOC pointer
|
// from the stack (although this function declares that it does not set up x-a
|
// frame, newproc1 does in fact allocate one for goexit and saves the TOC
|
// pointer in the correct place).
|
// goexit+_PCQuantum is halfway through the usual global entry point prologue
|
// that derives r2 from r12 which is a bit silly, but not harmful.
|
TEXT runtime·goexit(SB),NOSPLIT|NOFRAME,$0-0
|
MOVD 24(R1), R2
|
BL runtime·goexit1(SB) // does not return
|
// traceback from goexit1 must hit code range of goexit
|
MOVD R0, R0 // NOP
|
|
TEXT runtime·sigreturn(SB),NOSPLIT,$0-0
|
RET
|
|
// prepGoExitFrame saves the current TOC pointer (i.e. the TOC pointer for the
|
// module containing runtime) to the frame that goexit will execute in when
|
// the goroutine exits. It's implemented in assembly mainly because that's the
|
// easiest way to get access to R2.
|
TEXT runtime·prepGoExitFrame(SB),NOSPLIT,$0-8
|
MOVD sp+0(FP), R3
|
MOVD R2, 24(R3)
|
RET
|
|
TEXT runtime·addmoduledata(SB),NOSPLIT|NOFRAME,$0-0
|
ADD $-8, R1
|
MOVD R31, 0(R1)
|
MOVD runtime·lastmoduledatap(SB), R4
|
MOVD R3, moduledata_next(R4)
|
MOVD R3, runtime·lastmoduledatap(SB)
|
MOVD 0(R1), R31
|
ADD $8, R1
|
RET
|
|
TEXT ·checkASM(SB),NOSPLIT,$0-1
|
MOVW $1, R3
|
MOVB R3, 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:
|
// - R20 is the destination of the write
|
// - R21 is the value being written at R20.
|
// It clobbers condition codes.
|
// It does not clobber R0 through R15,
|
// but may clobber any other register, *including* R31.
|
TEXT runtime·gcWriteBarrier(SB),NOSPLIT,$112
|
// The standard prologue clobbers R31.
|
// We use R16 and R17 as scratch registers.
|
MOVD g_m(g), R16
|
MOVD m_p(R16), R16
|
MOVD (p_wbBuf+wbBuf_next)(R16), R17
|
// Increment wbBuf.next position.
|
ADD $16, R17
|
MOVD R17, (p_wbBuf+wbBuf_next)(R16)
|
MOVD (p_wbBuf+wbBuf_end)(R16), R16
|
CMP R16, R17
|
// Record the write.
|
MOVD R21, -16(R17) // Record value
|
MOVD (R20), R16 // TODO: This turns bad writes into bad reads.
|
MOVD R16, -8(R17) // Record *slot
|
// Is the buffer full? (flags set in CMP above)
|
BEQ flush
|
ret:
|
// Do the write.
|
MOVD R21, (R20)
|
RET
|
|
flush:
|
// Save registers R0 through R15 since these were not saved by the caller.
|
// We don't save all registers on ppc64 because it takes too much space.
|
MOVD R20, (FIXED_FRAME+0)(R1) // Also first argument to wbBufFlush
|
MOVD R21, (FIXED_FRAME+8)(R1) // Also second argument to wbBufFlush
|
// R0 is always 0, so no need to spill.
|
// R1 is SP.
|
// R2 is SB.
|
MOVD R3, (FIXED_FRAME+16)(R1)
|
MOVD R4, (FIXED_FRAME+24)(R1)
|
MOVD R5, (FIXED_FRAME+32)(R1)
|
MOVD R6, (FIXED_FRAME+40)(R1)
|
MOVD R7, (FIXED_FRAME+48)(R1)
|
MOVD R8, (FIXED_FRAME+56)(R1)
|
MOVD R9, (FIXED_FRAME+64)(R1)
|
MOVD R10, (FIXED_FRAME+72)(R1)
|
MOVD R11, (FIXED_FRAME+80)(R1)
|
MOVD R12, (FIXED_FRAME+88)(R1)
|
// R13 is REGTLS
|
MOVD R14, (FIXED_FRAME+96)(R1)
|
MOVD R15, (FIXED_FRAME+104)(R1)
|
|
// This takes arguments R20 and R21.
|
CALL runtime·wbBufFlush(SB)
|
|
MOVD (FIXED_FRAME+0)(R1), R20
|
MOVD (FIXED_FRAME+8)(R1), R21
|
MOVD (FIXED_FRAME+16)(R1), R3
|
MOVD (FIXED_FRAME+24)(R1), R4
|
MOVD (FIXED_FRAME+32)(R1), R5
|
MOVD (FIXED_FRAME+40)(R1), R6
|
MOVD (FIXED_FRAME+48)(R1), R7
|
MOVD (FIXED_FRAME+56)(R1), R8
|
MOVD (FIXED_FRAME+64)(R1), R9
|
MOVD (FIXED_FRAME+72)(R1), R10
|
MOVD (FIXED_FRAME+80)(R1), R11
|
MOVD (FIXED_FRAME+88)(R1), R12
|
MOVD (FIXED_FRAME+96)(R1), R14
|
MOVD (FIXED_FRAME+104)(R1), R15
|
JMP ret
|
