code review 135830043: cmd/cc, runtime: convert C compilers to use Go calling ...

src/pkg/runtime/sys_linux_arm.s

 // Copyright 2009 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.
 
 //
 // System calls and other sys.stuff for arm, Linux
 //
 
 #include "zasm_GOOS_GOARCH.h"
 #include "../../cmd/ld/textflag.h"
@@ skipping 33 matching lines @@
 #define SYS_fcntl (SYS_BASE + 55)
 
 #define ARM_BASE (SYS_BASE + 0x0f0000)
 
 TEXT runtime·open(SB),NOSPLIT,$0
         MOVW    0(FP), R0
         MOVW    4(FP), R1
         MOVW    8(FP), R2
         MOVW    $SYS_open, R7
         SWI     $0
+        MOVW    R0, ret+12(FP)
         RET
 
 TEXT runtime·close(SB),NOSPLIT,$0
         MOVW    0(FP), R0
         MOVW    $SYS_close, R7
         SWI     $0
+        MOVW    R0, ret+4(FP)
         RET
 
 TEXT runtime·write(SB),NOSPLIT,$0
         MOVW    0(FP), R0
         MOVW    4(FP), R1
         MOVW    8(FP), R2
         MOVW    $SYS_write, R7
         SWI     $0
+        MOVW    R0, ret+12(FP)
         RET
 
 TEXT runtime·read(SB),NOSPLIT,$0
         MOVW    0(FP), R0
         MOVW    4(FP), R1
         MOVW    8(FP), R2
         MOVW    $SYS_read, R7
         SWI     $0
+        MOVW    R0, ret+12(FP)
         RET
 
 TEXT runtime·getrlimit(SB),NOSPLIT,$0
         MOVW    0(FP), R0
         MOVW    4(FP), R1
         MOVW    $SYS_ugetrlimit, R7
         SWI     $0
+        MOVW    R0, ret+8(FP)
         RET
 
 TEXT runtime·exit(SB),NOSPLIT,$-4
         MOVW    0(FP), R0
         MOVW    $SYS_exit_group, R7
         SWI     $0
         MOVW    $1234, R0
         MOVW    $1002, R1
         MOVW    R0, (R1)        // fail hard
 
@@ skipping 19 matching lines @@
         MOVW    4(FP), R1
         MOVW    8(FP), R2
         MOVW    12(FP), R3
         MOVW    16(FP), R4
         MOVW    20(FP), R5
         MOVW    $SYS_mmap2, R7
         SWI     $0
         MOVW    $0xfffff001, R6
         CMP             R6, R0
         RSB.HI  $0, R0
+        MOVW    R0, ret+24(FP)
         RET
 
 TEXT runtime·munmap(SB),NOSPLIT,$0
         MOVW    0(FP), R0
         MOVW    4(FP), R1
         MOVW    $SYS_munmap, R7
         SWI     $0
         MOVW    $0xfffff001, R6
         CMP     R6, R0
         MOVW.HI $0, R8  // crash on syscall failure
@@ skipping 16 matching lines @@
         MOVW    $SYS_setitimer, R7
         SWI     $0
         RET
 
 TEXT runtime·mincore(SB),NOSPLIT,$0
         MOVW    0(FP), R0
         MOVW    4(FP), R1
         MOVW    8(FP), R2
         MOVW    $SYS_mincore, R7
         SWI     $0
+        MOVW    R0, ret+12(FP)
         RET
 
 TEXT time·now(SB), NOSPLIT, $32
         MOVW    $0, R0  // CLOCK_REALTIME
         MOVW    $8(R13), R1  // timespec
         MOVW    $SYS_clock_gettime, R7
         SWI     $0
 ········
         MOVW    8(R13), R0  // sec
         MOVW    12(R13), R2  // nsec
 ········
         MOVW    R0, 0(FP)
         MOVW    $0, R1
         MOVW    R1, 4(FP)
         MOVW    R2, 8(FP)
         RET·····
 
-// int64 nanotime(void) so really
-// void nanotime(int64 *nsec)
+// int64 nanotime(void)
 TEXT runtime·nanotime(SB),NOSPLIT,$32
         MOVW    $1, R0  // CLOCK_MONOTONIC
         MOVW    $8(R13), R1  // timespec
         MOVW    $SYS_clock_gettime, R7
         SWI     $0
 ········
         MOVW    8(R13), R0  // sec
         MOVW    12(R13), R2  // nsec
 ········
         MOVW    $1000000000, R3
         MULLU   R0, R3, (R1, R0)
         MOVW    $0, R4
         ADD.S   R2, R0
         ADC     R4, R1
 
-        MOVW    0(FP), R3
-        MOVW    R0, 0(R3)
-        MOVW    R1, 4(R3)
+        MOVW    R0, ret_lo+0(FP)
+        MOVW    R1, ret_hi+4(FP)
         RET
 
 // int32 futex(int32 *uaddr, int32 op, int32 val,
 //      struct timespec *timeout, int32 *uaddr2, int32 val2);
 TEXT runtime·futex(SB),NOSPLIT,$0
         MOVW    4(SP), R0
         MOVW    8(SP), R1
         MOVW    12(SP), R2
         MOVW    16(SP), R3
         MOVW    20(SP), R4
         MOVW    24(SP), R5
         MOVW    $SYS_futex, R7
         SWI     $0
+        MOVW    R0, ret+24(FP)
         RET
 
 
 // int32 clone(int32 flags, void *stack, M *mp, G *gp, void (*fn)(void));
 TEXT runtime·clone(SB),NOSPLIT,$0
         MOVW    flags+0(FP), R0
-        MOVW    stack+4(FP), R1
+        MOVW    stk+4(FP), R1
         MOVW    $0, R2  // parent tid ptr
         MOVW    $0, R3  // tls_val
         MOVW    $0, R4  // child tid ptr
         MOVW    $0, R5
 
         // Copy mp, gp, fn off parent stack for use by child.
         // TODO(kaib): figure out which registers are clobbered by clone and avoid stack copying
         MOVW    $-16(R1), R1
         MOVW    mm+8(FP), R6
         MOVW    R6, 0(R1)
         MOVW    gg+12(FP), R6
         MOVW    R6, 4(R1)
         MOVW    fn+16(FP), R6
         MOVW    R6, 8(R1)
         MOVW    $1234, R6
         MOVW    R6, 12(R1)
 
         MOVW    $SYS_clone, R7
         SWI     $0
 
         // In parent, return.
         CMP     $0, R0
-        BEQ     2(PC)
+        BEQ     3(PC)
+        MOVW    R0, ret+20(FP)
         RET
 
         // Paranoia: check that SP is as we expect. Use R13 to avoid linker 'fixup'
         MOVW    12(R13), R0
         MOVW    $1234, R1
         CMP     R0, R1
         BEQ     2(PC)
         BL      runtime·abort(SB)
 
         MOVW    4(R13), g
@@ skipping 83 matching lines @@
         SWI     $0
         RET
 
 TEXT runtime·rt_sigaction(SB),NOSPLIT,$0
         MOVW    0(FP), R0
         MOVW    4(FP), R1
         MOVW    8(FP), R2
         MOVW    12(FP), R3
         MOVW    $SYS_rt_sigaction, R7
         SWI     $0
+        MOVW    R0, ret+16(FP)
         RET
 
 TEXT runtime·usleep(SB),NOSPLIT,$12
         MOVW    usec+0(FP), R0
         MOVW    R0, R1
         MOVW    $1000000, R2
         DIV     R2, R0
         MOD     R2, R1
         MOVW    R0, 4(SP)
         MOVW    R1, 8(SP)
         MOVW    $0, R0
         MOVW    $0, R1
         MOVW    $0, R2
         MOVW    $0, R3
         MOVW    $4(SP), R4
         MOVW    $SYS_select, R7
         SWI     $0
         RET
 
 // Use kernel version instead of native armcas in asm_arm.s.
 // See ../sync/atomic/asm_linux_arm.s for details.
 TEXT cas<>(SB),NOSPLIT,$0
         MOVW    $0xffff0fc0, PC
 
 TEXT runtime·cas(SB),NOSPLIT,$0
-        MOVW    valptr+0(FP), R2
+        MOVW    ptr+0(FP), R2
         MOVW    old+4(FP), R0
 casagain:
         MOVW    new+8(FP), R1
         BL      cas<>(SB)
         BCC     cascheck
         MOVW    $1, R0
+        MOVB    R0, ret+12(FP)
         RET
 cascheck:
         // Kernel lies; double-check.
-        MOVW    valptr+0(FP), R2
+        MOVW    ptr+0(FP), R2
         MOVW    old+4(FP), R0
         MOVW    0(R2), R3
         CMP     R0, R3
         BEQ     casagain
         MOVW    $0, R0
+        MOVB    R0, ret+12(FP)
         RET
 
 TEXT runtime·casp(SB),NOSPLIT,$0
         B       runtime·cas(SB)
 
 TEXT runtime·osyield(SB),NOSPLIT,$0
         MOVW    $SYS_sched_yield, R7
         SWI     $0
         RET
 
 TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0
         MOVW    0(FP), R0
         MOVW    4(FP), R1
         MOVW    8(FP), R2
         MOVW    $SYS_sched_getaffinity, R7
         SWI     $0
+        MOVW    R0, ret+12(FP)
         RET
 
 // int32 runtime·epollcreate(int32 size)
 TEXT runtime·epollcreate(SB),NOSPLIT,$0
         MOVW    0(FP), R0
         MOVW    $SYS_epoll_create, R7
         SWI     $0
+        MOVW    R0, ret+4(FP)
         RET
 
 // int32 runtime·epollcreate1(int32 flags)
 TEXT runtime·epollcreate1(SB),NOSPLIT,$0
         MOVW    0(FP), R0
         MOVW    $SYS_epoll_create1, R7
         SWI     $0
+        MOVW    R0, ret+4(FP)
         RET
 
 // int32 runtime·epollctl(int32 epfd, int32 op, int32 fd, EpollEvent *ev)
 TEXT runtime·epollctl(SB),NOSPLIT,$0
         MOVW    0(FP), R0
         MOVW    4(FP), R1
         MOVW    8(FP), R2
         MOVW    12(FP), R3
         MOVW    $SYS_epoll_ctl, R7
         SWI     $0
+        MOVW    R0, ret+16(FP)
         RET
 
 // int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout)
 TEXT runtime·epollwait(SB),NOSPLIT,$0
         MOVW    0(FP), R0
         MOVW    4(FP), R1
         MOVW    8(FP), R2
         MOVW    12(FP), R3
         MOVW    $SYS_epoll_wait, R7
         SWI     $0
+        MOVW    R0, ret+16(FP)
         RET
 
 // void runtime·closeonexec(int32 fd)
 TEXT runtime·closeonexec(SB),NOSPLIT,$0
         MOVW    0(FP), R0       // fd
         MOVW    $2, R1  // F_SETFD
         MOVW    $1, R2  // FD_CLOEXEC
         MOVW    $SYS_fcntl, R7
         SWI     $0
         RET
 
 // b __kuser_get_tls @ 0xffff0fe0
 TEXT runtime·read_tls_fallback(SB),NOSPLIT,$-4
         MOVW    $0xffff0fe0, R0
         B       (R0)