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+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build linux && (ppc64 || ppc64le)
+
+//
+// System calls and other sys.stuff for ppc64, Linux
+//
+
+#include "go_asm.h"
+#include "go_tls.h"
+#include "textflag.h"
+#include "asm_ppc64x.h"
+#include "cgo/abi_ppc64x.h"
+
+#define SYS_exit 1
+#define SYS_read 3
+#define SYS_write 4
+#define SYS_open 5
+#define SYS_close 6
+#define SYS_getpid 20
+#define SYS_kill 37
+#define SYS_brk 45
+#define SYS_mmap 90
+#define SYS_munmap 91
+#define SYS_setitimer 104
+#define SYS_clone 120
+#define SYS_sched_yield 158
+#define SYS_nanosleep 162
+#define SYS_rt_sigreturn 172
+#define SYS_rt_sigaction 173
+#define SYS_rt_sigprocmask 174
+#define SYS_sigaltstack 185
+#define SYS_madvise 205
+#define SYS_mincore 206
+#define SYS_gettid 207
+#define SYS_futex 221
+#define SYS_sched_getaffinity 223
+#define SYS_exit_group 234
+#define SYS_timer_create 240
+#define SYS_timer_settime 241
+#define SYS_timer_delete 244
+#define SYS_clock_gettime 246
+#define SYS_tgkill 250
+#define SYS_pipe2 317
+
+TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
+ MOVW code+0(FP), R3
+ SYSCALL $SYS_exit_group
+ RET
+
+// func exitThread(wait *atomic.Uint32)
+TEXT runtime·exitThread(SB),NOSPLIT|NOFRAME,$0-8
+ MOVD wait+0(FP), R1
+ // We're done using the stack.
+ MOVW $0, R2
+ SYNC
+ MOVW R2, (R1)
+ MOVW $0, R3 // exit code
+ SYSCALL $SYS_exit
+ JMP 0(PC)
+
+TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20
+ MOVD name+0(FP), R3
+ MOVW mode+8(FP), R4
+ MOVW perm+12(FP), R5
+ SYSCALL $SYS_open
+ BVC 2(PC)
+ MOVW $-1, R3
+ MOVW R3, ret+16(FP)
+ RET
+
+TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
+ MOVW fd+0(FP), R3
+ SYSCALL $SYS_close
+ BVC 2(PC)
+ MOVW $-1, R3
+ MOVW R3, ret+8(FP)
+ RET
+
+TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0-28
+ MOVD fd+0(FP), R3
+ MOVD p+8(FP), R4
+ MOVW n+16(FP), R5
+ SYSCALL $SYS_write
+ BVC 2(PC)
+ NEG R3 // caller expects negative errno
+ MOVW R3, ret+24(FP)
+ RET
+
+TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28
+ MOVW fd+0(FP), R3
+ MOVD p+8(FP), R4
+ MOVW n+16(FP), R5
+ SYSCALL $SYS_read
+ BVC 2(PC)
+ NEG R3 // caller expects negative errno
+ MOVW R3, ret+24(FP)
+ RET
+
+// func pipe2(flags int32) (r, w int32, errno int32)
+TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
+ ADD $FIXED_FRAME+8, R1, R3
+ MOVW flags+0(FP), R4
+ SYSCALL $SYS_pipe2
+ MOVW R3, errno+16(FP)
+ RET
+
+// func usleep(usec uint32)
+TEXT runtime·usleep(SB),NOSPLIT,$16-4
+ MOVW usec+0(FP), R3
+
+ // Use magic constant 0x8637bd06 and shift right 51
+ // to perform usec/1000000.
+ MOVD $0x8637bd06, R4
+ MULLD R3, R4, R4 // Convert usec to S.
+ SRD $51, R4, R4
+ MOVD R4, 8(R1) // Store to tv_sec
+
+ MOVD $1000000, R5
+ MULLW R4, R5, R5 // Convert tv_sec back into uS
+ SUB R5, R3, R5 // Compute remainder uS.
+ MULLD $1000, R5, R5 // Convert to nsec
+ MOVD R5, 16(R1) // Store to tv_nsec
+
+ // nanosleep(&ts, 0)
+ ADD $8, R1, R3
+ MOVW $0, R4
+ SYSCALL $SYS_nanosleep
+ RET
+
+TEXT runtime·gettid(SB),NOSPLIT,$0-4
+ SYSCALL $SYS_gettid
+ MOVW R3, ret+0(FP)
+ RET
+
+TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0
+ SYSCALL $SYS_getpid
+ MOVW R3, R14
+ SYSCALL $SYS_gettid
+ MOVW R3, R4 // arg 2 tid
+ MOVW R14, R3 // arg 1 pid
+ MOVW sig+0(FP), R5 // arg 3
+ SYSCALL $SYS_tgkill
+ RET
+
+TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0
+ SYSCALL $SYS_getpid
+ MOVW R3, R3 // arg 1 pid
+ MOVW sig+0(FP), R4 // arg 2
+ SYSCALL $SYS_kill
+ RET
+
+TEXT ·getpid(SB),NOSPLIT|NOFRAME,$0-8
+ SYSCALL $SYS_getpid
+ MOVD R3, ret+0(FP)
+ RET
+
+TEXT ·tgkill(SB),NOSPLIT|NOFRAME,$0-24
+ MOVD tgid+0(FP), R3
+ MOVD tid+8(FP), R4
+ MOVD sig+16(FP), R5
+ SYSCALL $SYS_tgkill
+ RET
+
+TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24
+ MOVW mode+0(FP), R3
+ MOVD new+8(FP), R4
+ MOVD old+16(FP), R5
+ SYSCALL $SYS_setitimer
+ RET
+
+TEXT runtime·timer_create(SB),NOSPLIT,$0-28
+ MOVW clockid+0(FP), R3
+ MOVD sevp+8(FP), R4
+ MOVD timerid+16(FP), R5
+ SYSCALL $SYS_timer_create
+ MOVW R3, ret+24(FP)
+ RET
+
+TEXT runtime·timer_settime(SB),NOSPLIT,$0-28
+ MOVW timerid+0(FP), R3
+ MOVW flags+4(FP), R4
+ MOVD new+8(FP), R5
+ MOVD old+16(FP), R6
+ SYSCALL $SYS_timer_settime
+ MOVW R3, ret+24(FP)
+ RET
+
+TEXT runtime·timer_delete(SB),NOSPLIT,$0-12
+ MOVW timerid+0(FP), R3
+ SYSCALL $SYS_timer_delete
+ MOVW R3, ret+8(FP)
+ RET
+
+TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
+ MOVD addr+0(FP), R3
+ MOVD n+8(FP), R4
+ MOVD dst+16(FP), R5
+ SYSCALL $SYS_mincore
+ NEG R3 // caller expects negative errno
+ MOVW R3, ret+24(FP)
+ RET
+
+// func walltime() (sec int64, nsec int32)
+TEXT runtime·walltime(SB),NOSPLIT,$16-12
+ MOVD R1, R15 // R15 is unchanged by C code
+ MOVD g_m(g), R21 // R21 = m
+
+ MOVD $0, R3 // CLOCK_REALTIME
+
+ MOVD runtime·vdsoClockgettimeSym(SB), R12 // Check for VDSO availability
+ CMP R12, R0
+ BEQ fallback
+
+ // Set vdsoPC and vdsoSP for SIGPROF traceback.
+ // Save the old values on stack and restore them on exit,
+ // so this function is reentrant.
+ MOVD m_vdsoPC(R21), R4
+ MOVD m_vdsoSP(R21), R5
+ MOVD R4, 32(R1)
+ MOVD R5, 40(R1)
+
+ MOVD LR, R14
+ MOVD $ret-FIXED_FRAME(FP), R5 // caller's SP
+ MOVD R14, m_vdsoPC(R21)
+ MOVD R5, m_vdsoSP(R21)
+
+ MOVD m_curg(R21), R6
+ CMP g, R6
+ BNE noswitch
+
+ MOVD m_g0(R21), R7
+ MOVD (g_sched+gobuf_sp)(R7), R1 // Set SP to g0 stack
+
+noswitch:
+ SUB $16, R1 // Space for results
+ RLDICR $0, R1, $59, R1 // Align for C code
+ MOVD R12, CTR
+ MOVD R1, R4
+
+ // Store g on gsignal's stack, so if we receive a signal
+ // during VDSO code we can find the g.
+ // If we don't have a signal stack, we won't receive signal,
+ // so don't bother saving g.
+ // When using cgo, we already saved g on TLS, also don't save
+ // g here.
+ // Also don't save g if we are already on the signal stack.
+ // We won't get a nested signal.
+ MOVBZ runtime·iscgo(SB), R22
+ CMP R22, $0
+ BNE nosaveg
+ MOVD m_gsignal(R21), R22 // g.m.gsignal
+ CMP R22, $0
+ BEQ nosaveg
+
+ CMP g, R22
+ BEQ nosaveg
+ MOVD (g_stack+stack_lo)(R22), R22 // g.m.gsignal.stack.lo
+ MOVD g, (R22)
+
+ BL (CTR) // Call from VDSO
+
+ MOVD $0, (R22) // clear g slot, R22 is unchanged by C code
+
+ JMP finish
+
+nosaveg:
+ BL (CTR) // Call from VDSO
+
+finish:
+ MOVD $0, R0 // Restore R0
+ MOVD 0(R1), R3 // sec
+ MOVD 8(R1), R5 // nsec
+ MOVD R15, R1 // Restore SP
+
+ // Restore vdsoPC, vdsoSP
+ // We don't worry about being signaled between the two stores.
+ // If we are not in a signal handler, we'll restore vdsoSP to 0,
+ // and no one will care about vdsoPC. If we are in a signal handler,
+ // we cannot receive another signal.
+ MOVD 40(R1), R6
+ MOVD R6, m_vdsoSP(R21)
+ MOVD 32(R1), R6
+ MOVD R6, m_vdsoPC(R21)
+
+return:
+ MOVD R3, sec+0(FP)
+ MOVW R5, nsec+8(FP)
+ RET
+
+ // Syscall fallback
+fallback:
+ ADD $32, R1, R4
+ SYSCALL $SYS_clock_gettime
+ MOVD 32(R1), R3
+ MOVD 40(R1), R5
+ JMP return
+
+TEXT runtime·nanotime1(SB),NOSPLIT,$16-8
+ MOVD $1, R3 // CLOCK_MONOTONIC
+
+ MOVD R1, R15 // R15 is unchanged by C code
+ MOVD g_m(g), R21 // R21 = m
+
+ MOVD runtime·vdsoClockgettimeSym(SB), R12 // Check for VDSO availability
+ CMP R12, R0
+ BEQ fallback
+
+ // Set vdsoPC and vdsoSP for SIGPROF traceback.
+ // Save the old values on stack and restore them on exit,
+ // so this function is reentrant.
+ MOVD m_vdsoPC(R21), R4
+ MOVD m_vdsoSP(R21), R5
+ MOVD R4, 32(R1)
+ MOVD R5, 40(R1)
+
+ MOVD LR, R14 // R14 is unchanged by C code
+ MOVD $ret-FIXED_FRAME(FP), R5 // caller's SP
+ MOVD R14, m_vdsoPC(R21)
+ MOVD R5, m_vdsoSP(R21)
+
+ MOVD m_curg(R21), R6
+ CMP g, R6
+ BNE noswitch
+
+ MOVD m_g0(R21), R7
+ MOVD (g_sched+gobuf_sp)(R7), R1 // Set SP to g0 stack
+
+noswitch:
+ SUB $16, R1 // Space for results
+ RLDICR $0, R1, $59, R1 // Align for C code
+ MOVD R12, CTR
+ MOVD R1, R4
+
+ // Store g on gsignal's stack, so if we receive a signal
+ // during VDSO code we can find the g.
+ // If we don't have a signal stack, we won't receive signal,
+ // so don't bother saving g.
+ // When using cgo, we already saved g on TLS, also don't save
+ // g here.
+ // Also don't save g if we are already on the signal stack.
+ // We won't get a nested signal.
+ MOVBZ runtime·iscgo(SB), R22
+ CMP R22, $0
+ BNE nosaveg
+ MOVD m_gsignal(R21), R22 // g.m.gsignal
+ CMP R22, $0
+ BEQ nosaveg
+
+ CMP g, R22
+ BEQ nosaveg
+ MOVD (g_stack+stack_lo)(R22), R22 // g.m.gsignal.stack.lo
+ MOVD g, (R22)
+
+ BL (CTR) // Call from VDSO
+
+ MOVD $0, (R22) // clear g slot, R22 is unchanged by C code
+
+ JMP finish
+
+nosaveg:
+ BL (CTR) // Call from VDSO
+
+finish:
+ MOVD $0, R0 // Restore R0
+ MOVD 0(R1), R3 // sec
+ MOVD 8(R1), R5 // nsec
+ MOVD R15, R1 // Restore SP
+
+ // Restore vdsoPC, vdsoSP
+ // We don't worry about being signaled between the two stores.
+ // If we are not in a signal handler, we'll restore vdsoSP to 0,
+ // and no one will care about vdsoPC. If we are in a signal handler,
+ // we cannot receive another signal.
+ MOVD 40(R1), R6
+ MOVD R6, m_vdsoSP(R21)
+ MOVD 32(R1), R6
+ MOVD R6, m_vdsoPC(R21)
+
+return:
+ // sec is in R3, nsec in R5
+ // return nsec in R3
+ MOVD $1000000000, R4
+ MULLD R4, R3
+ ADD R5, R3
+ MOVD R3, ret+0(FP)
+ RET
+
+ // Syscall fallback
+fallback:
+ ADD $32, R1, R4
+ SYSCALL $SYS_clock_gettime
+ MOVD 32(R1), R3
+ MOVD 40(R1), R5
+ JMP return
+
+TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
+ MOVW how+0(FP), R3
+ MOVD new+8(FP), R4
+ MOVD old+16(FP), R5
+ MOVW size+24(FP), R6
+ SYSCALL $SYS_rt_sigprocmask
+ BVC 2(PC)
+ MOVD R0, 0xf0(R0) // crash
+ RET
+
+TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36
+ MOVD sig+0(FP), R3
+ MOVD new+8(FP), R4
+ MOVD old+16(FP), R5
+ MOVD size+24(FP), R6
+ SYSCALL $SYS_rt_sigaction
+ BVC 2(PC)
+ NEG R3 // caller expects negative errno
+ MOVW R3, ret+32(FP)
+ RET
+
+#ifdef GOARCH_ppc64le
+// Call the function stored in _cgo_sigaction using the GCC calling convention.
+TEXT runtime·callCgoSigaction(SB),NOSPLIT,$0
+ MOVD sig+0(FP), R3
+ MOVD new+8(FP), R4
+ MOVD old+16(FP), R5
+ MOVD _cgo_sigaction(SB), R12
+ MOVD R12, CTR // R12 should contain the function address
+ MOVD R1, R15 // Save R1
+ MOVD R2, 24(R1) // Save R2
+ SUB $48, R1 // reserve 32 (frame) + 16 bytes for sp-8 where fp may be saved.
+ RLDICR $0, R1, $59, R1 // Align to 16 bytes for C code
+ BL (CTR)
+ XOR R0, R0, R0 // Clear R0 as Go expects
+ MOVD R15, R1 // Restore R1
+ MOVD 24(R1), R2 // Restore R2
+ MOVW R3, ret+24(FP) // Return result
+ RET
+#endif
+
+TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
+ MOVW sig+8(FP), R3
+ MOVD info+16(FP), R4
+ MOVD ctx+24(FP), R5
+ MOVD fn+0(FP), R12
+ MOVD R12, CTR
+ BL (CTR)
+ MOVD 24(R1), R2
+ RET
+
+#ifdef GO_PPC64X_HAS_FUNCDESC
+DEFINE_PPC64X_FUNCDESC(runtime·sigtramp, sigtramp<>)
+// cgo isn't supported on ppc64, but we need to supply a cgoSigTramp function.
+DEFINE_PPC64X_FUNCDESC(runtime·cgoSigtramp, sigtramp<>)
+TEXT sigtramp<>(SB),NOSPLIT|NOFRAME|TOPFRAME,$0
+#else
+// ppc64le doesn't need function descriptors
+// Save callee-save registers in the case of signal forwarding.
+// Same as on ARM64 https://golang.org/issue/31827 .
+//
+// Note, it is assumed this is always called indirectly (e.g via
+// a function pointer) as R2 may not be preserved when calling this
+// function. In those cases, the caller preserves their R2.
+TEXT runtime·sigtramp(SB),NOSPLIT|NOFRAME,$0
+#endif
+ // This is called with ELF calling conventions. Convert to Go.
+ // Allocate space for argument storage to call runtime.sigtrampgo.
+ STACK_AND_SAVE_HOST_TO_GO_ABI(32)
+
+ // this might be called in external code context,
+ // where g is not set.
+ MOVBZ runtime·iscgo(SB), R6
+ CMP R6, $0
+ BEQ 2(PC)
+ BL runtime·load_g(SB)
+
+ // R3,R4,R5 already hold the arguments. Forward them on.
+ // TODO: Indirectly call runtime.sigtrampgo to avoid the linker's static NOSPLIT stack
+ // overflow detection. It thinks this might be called on a small Go stack, but this is only
+ // called from a larger pthread or sigaltstack stack. Can the checker be improved to not
+ // flag a direct call here?
+ MOVD $runtime·sigtrampgo<ABIInternal>(SB), R12
+ MOVD R12, CTR
+ BL (CTR)
+ // Restore R2 (TOC pointer) in the event it might be used later in this function.
+ // If this was not compiled as shared code, R2 is undefined, reloading it is harmless.
+ MOVD 24(R1), R2
+
+ UNSTACK_AND_RESTORE_GO_TO_HOST_ABI(32)
+ RET
+
+#ifdef GOARCH_ppc64le
+TEXT runtime·cgoSigtramp(SB),NOSPLIT|NOFRAME,$0
+ // The stack unwinder, presumably written in C, may not be able to
+ // handle Go frame correctly. So, this function is NOFRAME, and we
+ // save/restore LR manually, and obey ELFv2 calling conventions.
+ MOVD LR, R10
+
+ // We're coming from C code, initialize R0
+ MOVD $0, R0
+
+ // If no traceback function, do usual sigtramp.
+ MOVD runtime·cgoTraceback(SB), R6
+ CMP $0, R6
+ BEQ sigtramp
+
+ // If no traceback support function, which means that
+ // runtime/cgo was not linked in, do usual sigtramp.
+ MOVD _cgo_callers(SB), R6
+ CMP $0, R6
+ BEQ sigtramp
+
+ // Inspect the g in TLS without clobbering R30/R31 via runtime.load_g.
+ MOVD runtime·tls_g(SB), R9
+ MOVD 0(R9), R9
+
+ // Figure out if we are currently in a cgo call.
+ // If not, just do usual sigtramp.
+ // compared to ARM64 and others.
+ CMP $0, R9
+ BEQ sigtrampnog // g == nil
+
+ // g is not nil. Check further.
+ MOVD g_m(R9), R6
+ CMP $0, R6
+ BEQ sigtramp // g.m == nil
+ MOVW m_ncgo(R6), R7
+ CMPW $0, R7
+ BEQ sigtramp // g.m.ncgo = 0
+ MOVD m_curg(R6), R7
+ CMP $0, R7
+ BEQ sigtramp // g.m.curg == nil
+ MOVD g_syscallsp(R7), R7
+ CMP $0, R7
+ BEQ sigtramp // g.m.curg.syscallsp == 0
+ MOVD m_cgoCallers(R6), R7 // R7 is the fifth arg in C calling convention.
+ CMP $0, R7
+ BEQ sigtramp // g.m.cgoCallers == nil
+ MOVW m_cgoCallersUse(R6), R8
+ CMPW $0, R8
+ BNE sigtramp // g.m.cgoCallersUse != 0
+
+ // Jump to a function in runtime/cgo.
+ // That function, written in C, will call the user's traceback
+ // function with proper unwind info, and will then call back here.
+ // The first three arguments, and the fifth, are already in registers.
+ // Set the two remaining arguments now.
+ MOVD runtime·cgoTraceback(SB), R6
+ MOVD $runtime·sigtramp(SB), R8
+ MOVD _cgo_callers(SB), R12
+ MOVD R12, CTR
+ MOVD R10, LR // restore LR
+ JMP (CTR)
+
+sigtramp:
+ MOVD R10, LR // restore LR
+ JMP runtime·sigtramp(SB)
+
+sigtrampnog:
+ // Signal arrived on a non-Go thread. If this is SIGPROF, get a
+ // stack trace.
+ CMPW R3, $27 // 27 == SIGPROF
+ BNE sigtramp
+
+ // Lock sigprofCallersUse (cas from 0 to 1).
+ MOVW $1, R7
+ MOVD $runtime·sigprofCallersUse(SB), R8
+ SYNC
+ LWAR (R8), R6
+ CMPW $0, R6
+ BNE sigtramp
+ STWCCC R7, (R8)
+ BNE -4(PC)
+ ISYNC
+
+ // Jump to the traceback function in runtime/cgo.
+ // It will call back to sigprofNonGo, which will ignore the
+ // arguments passed in registers.
+ // First three arguments to traceback function are in registers already.
+ MOVD runtime·cgoTraceback(SB), R6
+ MOVD $runtime·sigprofCallers(SB), R7
+ MOVD $runtime·sigprofNonGoWrapper<>(SB), R8
+ MOVD _cgo_callers(SB), R12
+ MOVD R12, CTR
+ MOVD R10, LR // restore LR
+ JMP (CTR)
+#endif
+
+// Used by cgoSigtramp to inspect without clobbering R30/R31 via runtime.load_g.
+GLOBL runtime·tls_g+0(SB), TLSBSS+DUPOK, $8
+
+TEXT runtime·sigprofNonGoWrapper<>(SB),NOSPLIT|NOFRAME,$0
+ // This is called from C code. Callee save registers must be saved.
+ // R3,R4,R5 hold arguments, and allocate argument space to call sigprofNonGo.
+ STACK_AND_SAVE_HOST_TO_GO_ABI(32)
+
+ CALL runtime·sigprofNonGo<ABIInternal>(SB)
+
+ UNSTACK_AND_RESTORE_GO_TO_HOST_ABI(32)
+ RET
+
+TEXT runtime·mmap(SB),NOSPLIT|NOFRAME,$0
+ MOVD addr+0(FP), R3
+ MOVD n+8(FP), R4
+ MOVW prot+16(FP), R5
+ MOVW flags+20(FP), R6
+ MOVW fd+24(FP), R7
+ MOVW off+28(FP), R8
+
+ SYSCALL $SYS_mmap
+ BVC ok
+ MOVD $0, p+32(FP)
+ MOVD R3, err+40(FP)
+ RET
+ok:
+ MOVD R3, p+32(FP)
+ MOVD $0, err+40(FP)
+ RET
+
+TEXT runtime·munmap(SB),NOSPLIT|NOFRAME,$0
+ MOVD addr+0(FP), R3
+ MOVD n+8(FP), R4
+ SYSCALL $SYS_munmap
+ BVC 2(PC)
+ MOVD R0, 0xf0(R0)
+ RET
+
+TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0
+ MOVD addr+0(FP), R3
+ MOVD n+8(FP), R4
+ MOVW flags+16(FP), R5
+ SYSCALL $SYS_madvise
+ MOVW R3, ret+24(FP)
+ RET
+
+// int64 futex(int32 *uaddr, int32 op, int32 val,
+// struct timespec *timeout, int32 *uaddr2, int32 val2);
+TEXT runtime·futex(SB),NOSPLIT|NOFRAME,$0
+ MOVD addr+0(FP), R3
+ MOVW op+8(FP), R4
+ MOVW val+12(FP), R5
+ MOVD ts+16(FP), R6
+ MOVD addr2+24(FP), R7
+ MOVW val3+32(FP), R8
+ SYSCALL $SYS_futex
+ BVC 2(PC)
+ NEG R3 // caller expects negative errno
+ MOVW R3, ret+40(FP)
+ RET
+
+// int64 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void));
+TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0
+ MOVW flags+0(FP), R3
+ MOVD stk+8(FP), R4
+
+ // Copy mp, gp, fn off parent stack for use by child.
+ // Careful: Linux system call clobbers ???.
+ MOVD mp+16(FP), R7
+ MOVD gp+24(FP), R8
+ MOVD fn+32(FP), R12
+
+ MOVD R7, -8(R4)
+ MOVD R8, -16(R4)
+ MOVD R12, -24(R4)
+ MOVD $1234, R7
+ MOVD R7, -32(R4)
+
+ SYSCALL $SYS_clone
+ BVC 2(PC)
+ NEG R3 // caller expects negative errno
+
+ // In parent, return.
+ CMP R3, $0
+ BEQ 3(PC)
+ MOVW R3, ret+40(FP)
+ RET
+
+ // In child, on new stack.
+ // initialize essential registers
+ BL runtime·reginit(SB)
+ MOVD -32(R1), R7
+ CMP R7, $1234
+ BEQ 2(PC)
+ MOVD R0, 0(R0)
+
+ // Initialize m->procid to Linux tid
+ SYSCALL $SYS_gettid
+
+ MOVD -24(R1), R12 // fn
+ MOVD -16(R1), R8 // g
+ MOVD -8(R1), R7 // m
+
+ CMP R7, $0
+ BEQ nog
+ CMP R8, $0
+ BEQ nog
+
+ MOVD R3, m_procid(R7)
+
+ // TODO: setup TLS.
+
+ // In child, set up new stack
+ MOVD R7, g_m(R8)
+ MOVD R8, g
+ //CALL runtime·stackcheck(SB)
+
+nog:
+ // Call fn
+ MOVD R12, CTR
+ BL (CTR)
+
+ // It shouldn't return. If it does, exit that thread.
+ MOVW $111, R3
+ SYSCALL $SYS_exit
+ BR -2(PC) // keep exiting
+
+TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
+ MOVD new+0(FP), R3
+ MOVD old+8(FP), R4
+ SYSCALL $SYS_sigaltstack
+ BVC 2(PC)
+ MOVD R0, 0xf0(R0) // crash
+ RET
+
+TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
+ SYSCALL $SYS_sched_yield
+ RET
+
+TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
+ MOVD pid+0(FP), R3
+ MOVD len+8(FP), R4
+ MOVD buf+16(FP), R5
+ SYSCALL $SYS_sched_getaffinity
+ BVC 2(PC)
+ NEG R3 // caller expects negative errno
+ MOVW R3, ret+24(FP)
+ RET
+
+// func sbrk0() uintptr
+TEXT runtime·sbrk0(SB),NOSPLIT|NOFRAME,$0
+ // Implemented as brk(NULL).
+ MOVD $0, R3
+ SYSCALL $SYS_brk
+ MOVD R3, ret+0(FP)
+ RET
+
+TEXT runtime·access(SB),$0-20
+ MOVD R0, 0(R0) // unimplemented, only needed for android; declared in stubs_linux.go
+ MOVW R0, ret+16(FP) // for vet
+ RET
+
+TEXT runtime·connect(SB),$0-28
+ MOVD R0, 0(R0) // unimplemented, only needed for android; declared in stubs_linux.go
+ MOVW R0, ret+24(FP) // for vet
+ RET
+
+TEXT runtime·socket(SB),$0-20
+ MOVD R0, 0(R0) // unimplemented, only needed for android; declared in stubs_linux.go
+ MOVW R0, ret+16(FP) // for vet
+ RET
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-18 05:56:28 +0000