blob: 9159a673721ff3aad7928c446ebfb136dee8c51c [file] [log] [blame]
// Copyright 2016 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"
// _rt0_s390x_lib is common startup code for s390x systems when
// using -buildmode=c-archive or -buildmode=c-shared. The linker will
// arrange to invoke this function as a global constructor (for
// c-archive) or when the shared library is loaded (for c-shared).
// We expect argc and argv to be passed in the usual C ABI registers
// R2 and R3.
TEXT _rt0_s390x_lib(SB), NOSPLIT|NOFRAME, $0
STMG R6, R15, 48(R15)
MOVD R2, _rt0_s390x_lib_argc<>(SB)
MOVD R3, _rt0_s390x_lib_argv<>(SB)
// Save R6-R15 in the register save area of the calling function.
STMG R6, R15, 48(R15)
// Allocate 80 bytes on the stack.
MOVD $-80(R15), R15
// Save F8-F15 in our stack frame.
FMOVD F8, 16(R15)
FMOVD F9, 24(R15)
FMOVD F10, 32(R15)
FMOVD F11, 40(R15)
FMOVD F12, 48(R15)
FMOVD F13, 56(R15)
FMOVD F14, 64(R15)
FMOVD F15, 72(R15)
// Synchronous initialization.
MOVD $runtime·libpreinit(SB), R1
// Create a new thread to finish Go runtime initialization.
MOVD _cgo_sys_thread_create(SB), R1
CMP R1, $0
BEQ nocgo
MOVD $_rt0_s390x_lib_go(SB), R2
MOVD $0, R3
BR restore
MOVD $0x800000, R1 // stacksize
MOVD R1, 0(R15)
MOVD $_rt0_s390x_lib_go(SB), R1
MOVD R1, 8(R15) // fn
MOVD $runtime·newosproc(SB), R1
// Restore F8-F15 from our stack frame.
FMOVD 16(R15), F8
FMOVD 24(R15), F9
FMOVD 32(R15), F10
FMOVD 40(R15), F11
FMOVD 48(R15), F12
FMOVD 56(R15), F13
FMOVD 64(R15), F14
FMOVD 72(R15), F15
MOVD $80(R15), R15
// Restore R6-R15.
LMG 48(R15), R6, R15
// _rt0_s390x_lib_go initializes the Go runtime.
// This is started in a separate thread by _rt0_s390x_lib.
TEXT _rt0_s390x_lib_go(SB), NOSPLIT|NOFRAME, $0
MOVD _rt0_s390x_lib_argc<>(SB), R2
MOVD _rt0_s390x_lib_argv<>(SB), R3
MOVD $runtime·rt0_go(SB), R1
DATA _rt0_s390x_lib_argc<>(SB)/8, $0
GLOBL _rt0_s390x_lib_argc<>(SB), NOPTR, $8
DATA _rt0_s90x_lib_argv<>(SB)/8, $0
GLOBL _rt0_s390x_lib_argv<>(SB), NOPTR, $8
TEXT runtime·rt0_go(SB),NOSPLIT|TOPFRAME,$0
// R2 = argc; R3 = argv; R11 = temp; R13 = g; R15 = stack pointer
// C TLS base pointer in AR0:AR1
// initialize essential registers
XOR R0, R0
SUB $24, R15
MOVW R2, 8(R15) // argc
MOVD R3, 16(R15) // argv
// create istack out of the given (operating system) stack.
// _cgo_init may update stackguard.
MOVD $runtime·g0(SB), g
MOVD R15, R11
SUB $(64*1024), R11
MOVD R11, g_stackguard0(g)
MOVD R11, g_stackguard1(g)
MOVD R11, (g_stack+stack_lo)(g)
MOVD R15, (g_stack+stack_hi)(g)
// if there is a _cgo_init, call it using the gcc ABI.
MOVD _cgo_init(SB), R11
CMPBEQ R11, $0, nocgo
MOVW AR0, R4 // (AR0 << 32 | AR1) is the TLS base pointer; MOVD is translated to EAR
SLD $32, R4, R4
MOVW AR1, R4 // arg 2: TLS base pointer
MOVD $setg_gcc<>(SB), R3 // arg 1: setg
MOVD g, R2 // arg 0: G
// C functions expect 160 bytes of space on caller stack frame
// and an 8-byte aligned stack pointer
MOVD R15, R9 // save current stack (R9 is preserved in the Linux ABI)
SUB $160, R15 // reserve 160 bytes
MOVD $~7, R6
AND R6, R15 // 8-byte align
BL R11 // this call clobbers volatile registers according to Linux ABI (R0-R5, R14)
MOVD R9, R15 // restore stack
XOR R0, R0 // zero R0
// update stackguard after _cgo_init
MOVD (g_stack+stack_lo)(g), R2
ADD $const__StackGuard, R2
MOVD R2, g_stackguard0(g)
MOVD R2, g_stackguard1(g)
// set the per-goroutine and per-mach "registers"
MOVD $runtime·m0(SB), R2
// save m->g0 = g0
MOVD g, m_g0(R2)
// save m0 to g0->m
MOVD R2, g_m(g)
BL runtime·check(SB)
// argc/argv are already prepared on stack
BL runtime·args(SB)
BL runtime·osinit(SB)
BL runtime·schedinit(SB)
// create a new goroutine to start program
MOVD $runtime·mainPC(SB), R2 // entry
SUB $16, R15
MOVD R2, 8(R15)
MOVD $0, 0(R15)
BL runtime·newproc(SB)
ADD $16, R15
// start this M
BL runtime·mstart(SB)
MOVD $0, 1(R0)
DATA runtime·mainPC+0(SB)/8,$runtime·main(SB)
GLOBL runtime·mainPC(SB),RODATA,$8
TEXT runtime·breakpoint(SB),NOSPLIT|NOFRAME,$0-0
MOVD $0, 2(R0)
TEXT runtime·asminit(SB),NOSPLIT|NOFRAME,$0-0
TEXT runtime·mstart(SB),NOSPLIT|TOPFRAME,$0
CALL 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), R7 // make sure g != nil
BR gogo<>(SB)
MOVD R6, g
BL runtime·save_g(SB)
MOVD 0(g), R4
MOVD gobuf_sp(R5), R15
MOVD gobuf_lr(R5), LR
MOVD gobuf_ret(R5), R3
MOVD gobuf_ctxt(R5), R12
MOVD $0, gobuf_sp(R5)
MOVD $0, gobuf_ret(R5)
MOVD $0, gobuf_lr(R5)
MOVD $0, gobuf_ctxt(R5)
CMP R0, R0 // set condition codes for == test, needed by stack split
MOVD gobuf_pc(R5), R6
BR (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, $-8-8
// Save caller state in g->sched
MOVD R15, (g_sched+gobuf_sp)(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
BR runtime·badmcall(SB)
MOVD fn+0(FP), R12 // context
MOVD 0(R12), R4 // code pointer
MOVD (g_sched+gobuf_sp)(g), R15 // sp = m->g0->sched.sp
SUB $16, R15
MOVD R3, 8(R15)
MOVD $0, 0(R15)
BL (R4)
BR 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
BL (LR) // make sure this function is not leaf
// func systemstack(fn func())
TEXT runtime·systemstack(SB), NOSPLIT, $0-8
MOVD fn+0(FP), R3 // R3 = fn
MOVD R3, R12 // context
MOVD g_m(g), R4 // R4 = m
MOVD m_gsignal(R4), R5 // R5 = gsignal
CMPBEQ g, R5, noswitch
MOVD m_g0(R4), R5 // R5 = g0
CMPBEQ g, R5, noswitch
MOVD m_curg(R4), R6
CMPBEQ g, R6, 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)
BL runtime·abort(SB)
// 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), R15
// call target function
MOVD 0(R12), 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), R15
MOVD $0, (g_sched+gobuf_sp)(g)
// 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(R12), R3 // code pointer
MOVD 0(R15), LR // restore LR
ADD $8, R15
BR (R3)
* support for morestack
// Called during function prolog when more stack is needed.
// Caller has already loaded:
// R3: framesize, R4: argsize, 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).
MOVD g_m(g), R7
MOVD m_g0(R7), R8
CMPBNE g, R8, 3(PC)
BL runtime·badmorestackg0(SB)
BL runtime·abort(SB)
// Cannot grow signal stack (m->gsignal).
MOVD m_gsignal(R7), R8
CMP g, R8
BL runtime·badmorestackgsignal(SB)
BL runtime·abort(SB)
// Called from f.
// Set g->sched to context in f.
MOVD R15, (g_sched+gobuf_sp)(g)
MOVD R8, (g_sched+gobuf_pc)(g)
MOVD R5, (g_sched+gobuf_lr)(g)
MOVD R12, (g_sched+gobuf_ctxt)(g)
// Called from f.
// Set m->morebuf to f's caller.
MOVD R5, (m_morebuf+gobuf_pc)(R7) // f's caller's PC
MOVD R15, (m_morebuf+gobuf_sp)(R7) // f's caller's SP
MOVD g, (m_morebuf+gobuf_g)(R7)
// Call newstack on m->g0's stack.
MOVD m_g0(R7), g
BL runtime·save_g(SB)
MOVD (g_sched+gobuf_sp)(g), R15
// Create a stack frame on g0 to call newstack.
MOVD $0, -8(R15) // Zero saved LR in frame
SUB $8, R15
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.
TEXT runtime·morestack_noctxt(SB),NOSPLIT|NOFRAME,$0-0
MOVD $0, R12
BR runtime·morestack(SB)
// 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!
CMP R3, R4; \
BGT 3(PC); \
BR (R5)
// Note: can't just "BR NAME(SB)" - bad inlining results.
TEXT ·reflectcall(SB), NOSPLIT, $-8-48
MOVWZ frameSize+32(FP), R3
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), R5
BR (R5)
/* copy arguments to stack */ \
MOVD stackArgs+16(FP), R4; \
MOVWZ stackArgsSize+24(FP), R5; \
MOVD $stack-MAXSIZE(SP), R6; \
loopArgs: /* copy 256 bytes at a time */ \
CMP R5, $256; \
BLT tailArgs; \
SUB $256, R5; \
MVC $256, 0(R4), 0(R6); \
MOVD $256(R4), R4; \
MOVD $256(R6), R6; \
BR loopArgs; \
tailArgs: /* copy remaining bytes */ \
CMP R5, $0; \
BEQ callFunction; \
SUB $1, R5; \
EXRL $callfnMVC<>(SB), R5; \
callFunction: \
MOVD f+8(FP), R12; \
MOVD (R12), R8; \
PCDATA $PCDATA_StackMapIndex, $0; \
BL (R8); \
/* copy return values back */ \
MOVD stackArgsType+0(FP), R7; \
MOVD stackArgs+16(FP), R6; \
MOVWZ stackArgsSize+24(FP), R5; \
MOVD $stack-MAXSIZE(SP), R4; \
MOVWZ stackRetOffset+28(FP), R1; \
ADD R1, R4; \
ADD R1, R6; \
SUB R1, R5; \
BL callRet<>(SB); \
// 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, $40-0
MOVD R7, 8(R15)
MOVD R6, 16(R15)
MOVD R4, 24(R15)
MOVD R5, 32(R15)
MOVD $0, 40(R15)
BL runtime·reflectcallmove(SB)
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)
// Not a function: target for EXRL (execute relative long) instruction.
MVC $1, 0(R4), 0(R6)
TEXT runtime·procyield(SB),NOSPLIT,$0-0
// 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 R1.
TEXT gosave_systemstack_switch<>(SB),NOSPLIT|NOFRAME,$0
MOVD $runtime·systemstack_switch(SB), R1
ADD $16, R1 // get past prologue
MOVD R1, (g_sched+gobuf_pc)(g)
MOVD R15, (g_sched+gobuf_sp)(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), R1
CMPBEQ R1, $0, 2(PC)
BL runtime·abort(SB)
// 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
// R2 = argc; R3 = argv; R11 = temp; R13 = g; R15 = stack pointer
// C TLS base pointer in AR0:AR1
MOVD fn+0(FP), R3
MOVD arg+8(FP), R4
MOVD R15, R2 // 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. Or we might already
// be on the m->gsignal stack.
MOVD g_m(g), R6
MOVD m_gsignal(R6), R7
CMPBEQ R7, g, g0
MOVD m_g0(R6), R7
CMPBEQ R7, g, g0
BL gosave_systemstack_switch<>(SB)
MOVD R7, g
BL runtime·save_g(SB)
MOVD (g_sched+gobuf_sp)(g), R15
// Now on a scheduling stack (a pthread-created stack).
// Save room for two of our pointers, plus 160 bytes of callee
// save area that lives on the caller stack.
SUB $176, R15
MOVD $~7, R6
AND R6, R15 // 8-byte alignment for gcc ABI
MOVD R5, 168(R15) // save old g on stack
MOVD (g_stack+stack_hi)(R5), R5
SUB R2, R5
MOVD R5, 160(R15) // save depth in old g stack (can't just save SP, as stack might be copied during a callback)
MOVD $0, 0(R15) // clear back chain pointer (TODO can we give it real back trace information?)
MOVD R4, R2 // arg in R2
BL R3 // can clobber: R0-R5, R14, F0-F3, F5, F7-F15
XOR R0, R0 // set R0 back to 0.
// Restore g, stack pointer.
MOVD 168(R15), g
BL runtime·save_g(SB)
MOVD (g_stack+stack_hi)(g), R5
MOVD 160(R15), R6
SUB R6, R5
MOVD R5, R15
MOVW R2, ret+16(FP)
// cgocallback(fn, frame unsafe.Pointer, ctxt uintptr)
// See cgocall.go for more details.
TEXT ·cgocallback(SB),NOSPLIT,$24-24
// Load m and g from thread-local storage.
MOVB runtime·iscgo(SB), R3
CMPBEQ R3, $0, nocgo
BL runtime·load_g(SB)
// 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.
CMPBEQ g, $0, needm
MOVD g_m(g), R8
MOVD R8, savedm-8(SP)
BR havem
MOVD g, savedm-8(SP) // g is zero, so is m.
MOVD $runtime·needm(SB), R3
BL (R3)
// 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 R15, (g_sched+gobuf_sp)(R3)
// 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-24(SP) // must match frame size
MOVD R15, (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, -(24+8)(R4) // "saved LR"; must match frame size
// Gather our arguments into registers.
MOVD fn+0(FP), R1
MOVD frame+8(FP), R2
MOVD ctxt+16(FP), R3
MOVD $-(24+8)(R4), R15 // switch stack; must match frame size
MOVD R1, 8(R15)
MOVD R2, 16(R15)
MOVD R3, 24(R15)
BL runtime·cgocallbackg(SB)
// Restore g->sched (== m->curg->sched) from saved values.
MOVD 0(R15), R5
MOVD R5, (g_sched+gobuf_pc)(g)
MOVD $(24+8)(R15), R4 // must match frame size
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), R15
MOVD savedsp-24(SP), R4 // must match frame size
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
CMPBNE R6, $0, droppedm
MOVD $runtime·dropm(SB), R3
BL (R3)
// Done!
// 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)
// void setg_gcc(G*); set g in C TLS.
// Must obey the gcc calling convention.
TEXT setg_gcc<>(SB),NOSPLIT|NOFRAME,$0-0
// The standard prologue clobbers LR (R14), which is callee-save in
// the C ABI, so we have to use NOFRAME and save LR ourselves.
// Also save g, R10, and R11 since they're callee-save in C ABI
MOVD R10, R3
MOVD g, R4
MOVD R11, R5
MOVD R2, g
BL runtime·save_g(SB)
MOVD R5, R11
MOVD R4, g
MOVD R3, R10
TEXT runtime·abort(SB),NOSPLIT|NOFRAME,$0-0
MOVW (R0), R0
// int64 runtime·cputicks(void)
TEXT runtime·cputicks(SB),NOSPLIT,$0-8
// The TOD clock on s390 counts from the year 1900 in ~250ps intervals.
// This means that since about 1972 the msb has been set, making the
// result of a call to STORE CLOCK (stck) a negative number.
// We clear the msb to make it positive.
STCK ret+0(FP) // serialises before and after call
MOVD ret+0(FP), R3 // R3 will wrap to 0 in the year 2043
SLD $1, R3
SRD $1, R3
MOVD R3, ret+0(FP)
// AES hashing not implemented for s390x
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, R3
// 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 (R13), R10, R11 and LR (R14) are callee-save in the C ABI, so save them
MOVD g, R1
MOVD R10, R3
MOVD R11, R5
BL runtime·load_g(SB) // clobbers g (R13), R10, R11
MOVD g_m(g), R2
MOVD m_curg(R2), R2
MOVD (g_stack+stack_hi)(R2), R2
MOVD R1, g
MOVD R3, R10
MOVD R5, R11
// The top-most function running on a goroutine
// returns to goexit+PCQuantum.
BYTE $0x07; BYTE $0x00; // 2-byte nop
BL runtime·goexit1(SB) // does not return
// traceback from goexit1 must hit code range of goexit
BYTE $0x07; BYTE $0x00; // 2-byte nop
TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
// Stores are already ordered on s390x, so this is just a
// compile barrier.
// This is called from .init_array and follows the platform, not Go, ABI.
// We are overly conservative. We could only save the registers we use.
// However, since this function is only called once per loaded module
// performance is unimportant.
TEXT runtime·addmoduledata(SB),NOSPLIT|NOFRAME,$0-0
// Save R6-R15 in the register save area of the calling function.
// Don't bother saving F8-F15 as we aren't doing any calls.
STMG R6, R15, 48(R15)
// append the argument (passed in R2, as per the ELF ABI) to the
// moduledata linked list.
MOVD runtime·lastmoduledatap(SB), R1
MOVD R2, moduledata_next(R1)
MOVD R2, runtime·lastmoduledatap(SB)
// Restore R6-R15.
LMG 48(R15), R6, R15
MOVB $1, ret+0(FP)
// gcWriteBarrier performs a heap pointer write and informs the GC.
// gcWriteBarrier does NOT follow the Go ABI. It takes two arguments:
// - R2 is the destination of the write
// - R3 is the value being written at R2.
// It clobbers R10 (the temp register) and R1 (used by PLT stub).
// It does not clobber any other general-purpose registers,
// but may clobber others (e.g., floating point registers).
TEXT runtime·gcWriteBarrier(SB),NOSPLIT,$96
// Save the registers clobbered by the fast path.
MOVD R4, 96(R15)
MOVD g_m(g), R1
MOVD m_p(R1), R1
// Increment position.
MOVD $16, R4
ADD (p_wbBuf+wbBuf_next)(R1), R4
MOVD R4, (p_wbBuf+wbBuf_next)(R1)
MOVD (p_wbBuf+wbBuf_end)(R1), R1
// Record the write.
MOVD R3, -16(R4) // Record value
MOVD (R2), R10 // TODO: This turns bad writes into bad reads.
MOVD R10, -8(R4) // Record *slot
// Is the buffer full?
CMPBEQ R4, R1, flush
MOVD 96(R15), R4
// Do the write.
MOVD R3, (R2)
// Save all general purpose registers since these could be
// clobbered by wbBufFlush and were not saved by the caller.
STMG R2, R3, 8(R15) // set R2 and R3 as arguments for wbBufFlush
MOVD R0, 24(R15)
// R1 already saved.
// R4 already saved.
STMG R5, R12, 32(R15) // save R5 - R12
// R13 is g.
// R14 is LR.
// R15 is SP.
// This takes arguments R2 and R3.
CALL runtime·wbBufFlush(SB)
LMG 8(R15), R2, R3 // restore R2 - R3
MOVD 24(R15), R0 // restore R0
LMG 32(R15), R5, R12 // restore R5 - R12
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
MOVD R0, x+0(FP)
MOVD R1, y+8(FP)
JMP runtime·goPanicIndex(SB)
TEXT runtime·panicIndexU(SB),NOSPLIT,$0-16
MOVD R0, x+0(FP)
MOVD R1, y+8(FP)
JMP runtime·goPanicIndexU(SB)
TEXT runtime·panicSliceAlen(SB),NOSPLIT,$0-16
MOVD R1, x+0(FP)
MOVD R2, y+8(FP)
JMP runtime·goPanicSliceAlen(SB)
TEXT runtime·panicSliceAlenU(SB),NOSPLIT,$0-16
MOVD R1, x+0(FP)
MOVD R2, y+8(FP)
JMP runtime·goPanicSliceAlenU(SB)
TEXT runtime·panicSliceAcap(SB),NOSPLIT,$0-16
MOVD R1, x+0(FP)
MOVD R2, y+8(FP)
JMP runtime·goPanicSliceAcap(SB)
TEXT runtime·panicSliceAcapU(SB),NOSPLIT,$0-16
MOVD R1, x+0(FP)
MOVD R2, y+8(FP)
JMP runtime·goPanicSliceAcapU(SB)
TEXT runtime·panicSliceB(SB),NOSPLIT,$0-16
MOVD R0, x+0(FP)
MOVD R1, y+8(FP)
JMP runtime·goPanicSliceB(SB)
TEXT runtime·panicSliceBU(SB),NOSPLIT,$0-16
MOVD R0, x+0(FP)
MOVD R1, y+8(FP)
JMP runtime·goPanicSliceBU(SB)
TEXT runtime·panicSlice3Alen(SB),NOSPLIT,$0-16
MOVD R2, x+0(FP)
MOVD R3, y+8(FP)
JMP runtime·goPanicSlice3Alen(SB)
TEXT runtime·panicSlice3AlenU(SB),NOSPLIT,$0-16
MOVD R2, x+0(FP)
MOVD R3, y+8(FP)
JMP runtime·goPanicSlice3AlenU(SB)
TEXT runtime·panicSlice3Acap(SB),NOSPLIT,$0-16
MOVD R2, x+0(FP)
MOVD R3, y+8(FP)
JMP runtime·goPanicSlice3Acap(SB)
TEXT runtime·panicSlice3AcapU(SB),NOSPLIT,$0-16
MOVD R2, x+0(FP)
MOVD R3, y+8(FP)
JMP runtime·goPanicSlice3AcapU(SB)
TEXT runtime·panicSlice3B(SB),NOSPLIT,$0-16
MOVD R1, x+0(FP)
MOVD R2, y+8(FP)
JMP runtime·goPanicSlice3B(SB)
TEXT runtime·panicSlice3BU(SB),NOSPLIT,$0-16
MOVD R1, x+0(FP)
MOVD R2, y+8(FP)
JMP runtime·goPanicSlice3BU(SB)
TEXT runtime·panicSlice3C(SB),NOSPLIT,$0-16
MOVD R0, x+0(FP)
MOVD R1, y+8(FP)
JMP runtime·goPanicSlice3C(SB)
TEXT runtime·panicSlice3CU(SB),NOSPLIT,$0-16
MOVD R0, x+0(FP)
MOVD R1, y+8(FP)
JMP runtime·goPanicSlice3CU(SB)
TEXT runtime·panicSliceConvert(SB),NOSPLIT,$0-16
MOVD R2, x+0(FP)
MOVD R3, y+8(FP)
JMP runtime·goPanicSliceConvert(SB)