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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"
+
+#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
+
+TEXT runtime·sigreturn(SB),NOSPLIT,$0-0
+ RET
+
+#ifdef GOARCH_ppc64le
+// 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 .
+TEXT runtime·sigtramp(SB),NOSPLIT|NOFRAME,$0
+#else
+// function descriptor for the real sigtramp
+TEXT runtime·sigtramp(SB),NOSPLIT|NOFRAME,$0
+ DWORD $sigtramp<>(SB)
+ DWORD $0
+ DWORD $0
+TEXT sigtramp<>(SB),NOSPLIT|NOFRAME|TOPFRAME,$0
+#endif
+ // Start with standard C stack frame layout and linkage.
+ MOVD LR, R0
+ MOVD R0, 16(R1) // Save LR in caller's frame.
+ MOVW CR, R0 // Save CR in caller's frame
+ MOVD R0, 8(R1)
+ // The stack must be acquired here and not
+ // in the automatic way based on stack size
+ // since that sequence clobbers R31 before it
+ // gets saved.
+ // We are being ultra safe here in saving the
+ // Vregs. The case where they might need to
+ // be saved is very unlikely.
+ MOVDU R1, -544(R1)
+ MOVD R14, 64(R1)
+ MOVD R15, 72(R1)
+ MOVD R16, 80(R1)
+ MOVD R17, 88(R1)
+ MOVD R18, 96(R1)
+ MOVD R19, 104(R1)
+ MOVD R20, 112(R1)
+ MOVD R21, 120(R1)
+ MOVD R22, 128(R1)
+ MOVD R23, 136(R1)
+ MOVD R24, 144(R1)
+ MOVD R25, 152(R1)
+ MOVD R26, 160(R1)
+ MOVD R27, 168(R1)
+ MOVD R28, 176(R1)
+ MOVD R29, 184(R1)
+ MOVD g, 192(R1) // R30
+ MOVD R31, 200(R1)
+ FMOVD F14, 208(R1)
+ FMOVD F15, 216(R1)
+ FMOVD F16, 224(R1)
+ FMOVD F17, 232(R1)
+ FMOVD F18, 240(R1)
+ FMOVD F19, 248(R1)
+ FMOVD F20, 256(R1)
+ FMOVD F21, 264(R1)
+ FMOVD F22, 272(R1)
+ FMOVD F23, 280(R1)
+ FMOVD F24, 288(R1)
+ FMOVD F25, 296(R1)
+ FMOVD F26, 304(R1)
+ FMOVD F27, 312(R1)
+ FMOVD F28, 320(R1)
+ FMOVD F29, 328(R1)
+ FMOVD F30, 336(R1)
+ FMOVD F31, 344(R1)
+ // Save V regs
+ // STXVD2X and LXVD2X used since
+ // we aren't sure of alignment.
+ // Endianness doesn't matter
+ // if we are just loading and
+ // storing values.
+ MOVD $352, R7 // V20
+ STXVD2X VS52, (R7)(R1)
+ ADD $16, R7 // V21 368
+ STXVD2X VS53, (R7)(R1)
+ ADD $16, R7 // V22 384
+ STXVD2X VS54, (R7)(R1)
+ ADD $16, R7 // V23 400
+ STXVD2X VS55, (R7)(R1)
+ ADD $16, R7 // V24 416
+ STXVD2X VS56, (R7)(R1)
+ ADD $16, R7 // V25 432
+ STXVD2X VS57, (R7)(R1)
+ ADD $16, R7 // V26 448
+ STXVD2X VS58, (R7)(R1)
+ ADD $16, R7 // V27 464
+ STXVD2X VS59, (R7)(R1)
+ ADD $16, R7 // V28 480
+ STXVD2X VS60, (R7)(R1)
+ ADD $16, R7 // V29 496
+ STXVD2X VS61, (R7)(R1)
+ ADD $16, R7 // V30 512
+ STXVD2X VS62, (R7)(R1)
+ ADD $16, R7 // V31 528
+ STXVD2X VS63, (R7)(R1)
+
+ // initialize essential registers (just in case)
+ BL runtime·reginit(SB)
+
+ // 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)
+
+ MOVW R3, FIXED_FRAME+0(R1)
+ MOVD R4, FIXED_FRAME+8(R1)
+ MOVD R5, FIXED_FRAME+16(R1)
+ MOVD $runtime·sigtrampgo(SB), R12
+ MOVD R12, CTR
+ BL (CTR)
+ MOVD 24(R1), R2 // Should this be here? Where is it saved?
+ // Starts at 64; FIXED_FRAME is 32
+ MOVD 64(R1), R14
+ MOVD 72(R1), R15
+ MOVD 80(R1), R16
+ MOVD 88(R1), R17
+ MOVD 96(R1), R18
+ MOVD 104(R1), R19
+ MOVD 112(R1), R20
+ MOVD 120(R1), R21
+ MOVD 128(R1), R22
+ MOVD 136(R1), R23
+ MOVD 144(R1), R24
+ MOVD 152(R1), R25
+ MOVD 160(R1), R26
+ MOVD 168(R1), R27
+ MOVD 176(R1), R28
+ MOVD 184(R1), R29
+ MOVD 192(R1), g // R30
+ MOVD 200(R1), R31
+ FMOVD 208(R1), F14
+ FMOVD 216(R1), F15
+ FMOVD 224(R1), F16
+ FMOVD 232(R1), F17
+ FMOVD 240(R1), F18
+ FMOVD 248(R1), F19
+ FMOVD 256(R1), F20
+ FMOVD 264(R1), F21
+ FMOVD 272(R1), F22
+ FMOVD 280(R1), F23
+ FMOVD 288(R1), F24
+ FMOVD 292(R1), F25
+ FMOVD 300(R1), F26
+ FMOVD 308(R1), F27
+ FMOVD 316(R1), F28
+ FMOVD 328(R1), F29
+ FMOVD 336(R1), F30
+ FMOVD 344(R1), F31
+ MOVD $352, R7
+ LXVD2X (R7)(R1), VS52
+ ADD $16, R7 // 368 V21
+ LXVD2X (R7)(R1), VS53
+ ADD $16, R7 // 384 V22
+ LXVD2X (R7)(R1), VS54
+ ADD $16, R7 // 400 V23
+ LXVD2X (R7)(R1), VS55
+ ADD $16, R7 // 416 V24
+ LXVD2X (R7)(R1), VS56
+ ADD $16, R7 // 432 V25
+ LXVD2X (R7)(R1), VS57
+ ADD $16, R7 // 448 V26
+ LXVD2X (R7)(R1), VS58
+ ADD $16, R8 // 464 V27
+ LXVD2X (R7)(R1), VS59
+ ADD $16, R7 // 480 V28
+ LXVD2X (R7)(R1), VS60
+ ADD $16, R7 // 496 V29
+ LXVD2X (R7)(R1), VS61
+ ADD $16, R7 // 512 V30
+ LXVD2X (R7)(R1), VS62
+ ADD $16, R7 // 528 V31
+ LXVD2X (R7)(R1), VS63
+ ADD $544, R1
+ MOVD 8(R1), R0
+ MOVFL R0, $0xff
+ MOVD 16(R1), R0
+ MOVD R0, LR
+
+ RET
+
+#ifdef GOARCH_ppc64le
+// ppc64le doesn't need function descriptors
+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.
+ MOVD LR, R10
+
+ // We're coming from C code, initialize essential registers.
+ CALL runtime·reginit(SB)
+
+ // 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
+
+ // Set up g register.
+ CALL runtime·load_g(SB)
+
+ // Figure out if we are currently in a cgo call.
+ // If not, just do usual sigtramp.
+ // compared to ARM64 and others.
+ CMP $0, g
+ BEQ sigtrampnog // g == nil
+ MOVD g_m(g), 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)
+#else
+// function descriptor for the real sigtramp
+TEXT runtime·cgoSigtramp(SB),NOSPLIT|NOFRAME,$0
+ DWORD $cgoSigtramp<>(SB)
+ DWORD $0
+ DWORD $0
+TEXT cgoSigtramp<>(SB),NOSPLIT,$0
+ JMP sigtramp<>(SB)
+#endif
+
+TEXT runtime·sigprofNonGoWrapper<>(SB),NOSPLIT,$0
+ // We're coming from C code, set up essential register, then call sigprofNonGo.
+ CALL runtime·reginit(SB)
+ MOVW R3, FIXED_FRAME+0(R1) // sig
+ MOVD R4, FIXED_FRAME+8(R1) // info
+ MOVD R5, FIXED_FRAME+16(R1) // ctx
+ CALL runtime·sigprofNonGo(SB)
+ 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 2024-10-30 03:25:51 +0000