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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