runtime: use NOFRAME on arm64
This replaces frame size -8 with the NOFRAME flag in arm64 assembly.
This was automated with:
sed -i -e 's/\(^TEXT.*[A-Z]\),\( *\)\$-8/\1|NOFRAME,\2$0/' $(find -name '*_arm64.s')
Plus a manual fix to mkduff.go.
The go binary is identical before and after this change.
Change-Id: I0310384d1a584118c41d1cd3a042bb8ea7227efa
Reviewed-on: https://go-review.googlesource.com/92043
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
diff --git a/misc/cgo/test/issue9400/asm_arm64.s b/misc/cgo/test/issue9400/asm_arm64.s
index 9bb5081..2ebbfcc 100644
--- a/misc/cgo/test/issue9400/asm_arm64.s
+++ b/misc/cgo/test/issue9400/asm_arm64.s
@@ -6,7 +6,7 @@
#include "textflag.h"
-TEXT ·RewindAndSetgid(SB),NOSPLIT,$-8-0
+TEXT ·RewindAndSetgid(SB),NOSPLIT|NOFRAME,$0-0
// Save link register
MOVD R30, R9
diff --git a/src/runtime/asm_arm64.s b/src/runtime/asm_arm64.s
index daf3bf7..e41ee70 100644
--- a/src/runtime/asm_arm64.s
+++ b/src/runtime/asm_arm64.s
@@ -90,11 +90,11 @@
DATA runtime·mainPC+0(SB)/8,$runtime·main(SB)
GLOBL runtime·mainPC(SB),RODATA,$8
-TEXT runtime·breakpoint(SB),NOSPLIT,$-8-0
+TEXT runtime·breakpoint(SB),NOSPLIT|NOFRAME,$0-0
BRK
RET
-TEXT runtime·asminit(SB),NOSPLIT,$-8-0
+TEXT runtime·asminit(SB),NOSPLIT|NOFRAME,$0-0
RET
/*
@@ -103,7 +103,7 @@
// void gosave(Gobuf*)
// save state in Gobuf; setjmp
-TEXT runtime·gosave(SB), NOSPLIT, $-8-8
+TEXT runtime·gosave(SB), NOSPLIT|NOFRAME, $0-8
MOVD buf+0(FP), R3
MOVD RSP, R0
MOVD R0, gobuf_sp(R3)
@@ -143,7 +143,7 @@
// 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
+TEXT runtime·mcall(SB), NOSPLIT|NOFRAME, $0-8
// Save caller state in g->sched
MOVD RSP, R0
MOVD R0, (g_sched+gobuf_sp)(g)
@@ -257,7 +257,7 @@
// the top of a stack (for example, morestack calling newstack
// calling the scheduler calling newm calling gc), so we must
// record an argument size. For that purpose, it has no arguments.
-TEXT runtime·morestack(SB),NOSPLIT,$-8-0
+TEXT runtime·morestack(SB),NOSPLIT|NOFRAME,$0-0
// Cannot grow scheduler stack (m->g0).
MOVD g_m(g), R8
MOVD m_g0(R8), R4
@@ -300,7 +300,7 @@
// is still in this function, and not the beginning of the next.
UNDEF
-TEXT runtime·morestack_noctxt(SB),NOSPLIT,$-8-0
+TEXT runtime·morestack_noctxt(SB),NOSPLIT|NOFRAME,$0-0
MOVW $0, R26
B runtime·morestack(SB)
@@ -321,7 +321,7 @@
TEXT reflect·call(SB), NOSPLIT, $0-0
B ·reflectcall(SB)
-TEXT ·reflectcall(SB), NOSPLIT, $-8-32
+TEXT ·reflectcall(SB), NOSPLIT|NOFRAME, $0-32
MOVWU argsize+24(FP), R16
DISPATCH(runtime·call32, 32)
DISPATCH(runtime·call64, 64)
@@ -436,16 +436,16 @@
CALLFN(·call1073741824, 1073741832 )
// AES hashing not implemented for ARM64, issue #10109.
-TEXT runtime·aeshash(SB),NOSPLIT,$-8-0
+TEXT runtime·aeshash(SB),NOSPLIT|NOFRAME,$0-0
MOVW $0, R0
MOVW (R0), R1
-TEXT runtime·aeshash32(SB),NOSPLIT,$-8-0
+TEXT runtime·aeshash32(SB),NOSPLIT|NOFRAME,$0-0
MOVW $0, R0
MOVW (R0), R1
-TEXT runtime·aeshash64(SB),NOSPLIT,$-8-0
+TEXT runtime·aeshash64(SB),NOSPLIT|NOFRAME,$0-0
MOVW $0, R0
MOVW (R0), R1
-TEXT runtime·aeshashstr(SB),NOSPLIT,$-8-0
+TEXT runtime·aeshashstr(SB),NOSPLIT|NOFRAME,$0-0
MOVW $0, R0
MOVW (R0), R1
@@ -462,7 +462,7 @@
// 1. grab stored LR for caller
// 2. sub 4 bytes to get back to BL deferreturn
// 3. BR to fn
-TEXT runtime·jmpdefer(SB), NOSPLIT, $-8-16
+TEXT runtime·jmpdefer(SB), NOSPLIT|NOFRAME, $0-16
MOVD 0(RSP), R0
SUB $4, R0
MOVD R0, LR
@@ -475,7 +475,7 @@
B (R3)
// Save state of caller into g->sched. Smashes R0.
-TEXT gosave<>(SB),NOSPLIT,$-8
+TEXT gosave<>(SB),NOSPLIT|NOFRAME,$0
MOVD LR, (g_sched+gobuf_pc)(g)
MOVD RSP, R0
MOVD R0, (g_sched+gobuf_sp)(g)
@@ -703,17 +703,17 @@
MOVD savedR27-8(SP), R27
RET
-TEXT runtime·getcallerpc(SB),NOSPLIT,$-8-8
+TEXT runtime·getcallerpc(SB),NOSPLIT|NOFRAME,$0-8
MOVD 0(RSP), R0 // LR saved by caller
MOVD R0, ret+0(FP)
RET
-TEXT runtime·abort(SB),NOSPLIT,$-8-0
+TEXT runtime·abort(SB),NOSPLIT|NOFRAME,$0-0
B (ZR)
UNDEF
// memequal(a, b unsafe.Pointer, size uintptr) bool
-TEXT runtime·memequal(SB),NOSPLIT,$-8-25
+TEXT runtime·memequal(SB),NOSPLIT|NOFRAME,$0-25
MOVD size+16(FP), R1
// short path to handle 0-byte case
CBZ R1, equal
@@ -745,7 +745,7 @@
MOVB R3, ret+16(FP)
RET
-TEXT runtime·cmpstring(SB),NOSPLIT,$-8-40
+TEXT runtime·cmpstring(SB),NOSPLIT|NOFRAME,$0-40
MOVD s1_base+0(FP), R2
MOVD s1_len+8(FP), R0
MOVD s2_base+16(FP), R3
@@ -753,7 +753,7 @@
ADD $40, RSP, R7
B runtime·cmpbody<>(SB)
-TEXT bytes·Compare(SB),NOSPLIT,$-8-56
+TEXT bytes·Compare(SB),NOSPLIT|NOFRAME,$0-56
MOVD s1+0(FP), R2
MOVD s1+8(FP), R0
MOVD s2+24(FP), R3
@@ -770,7 +770,7 @@
//
// On exit:
// R4, R5, and R6 are clobbered
-TEXT runtime·cmpbody<>(SB),NOSPLIT,$-8-0
+TEXT runtime·cmpbody<>(SB),NOSPLIT|NOFRAME,$0-0
CMP R2, R3
BEQ samebytes // same starting pointers; compare lengths
CMP R0, R1
@@ -1033,7 +1033,7 @@
// The top-most function running on a goroutine
// returns to goexit+PCQuantum.
-TEXT runtime·goexit(SB),NOSPLIT,$-8-0
+TEXT runtime·goexit(SB),NOSPLIT|NOFRAME,$0-0
MOVD R0, R0 // NOP
BL runtime·goexit1(SB) // does not return
diff --git a/src/runtime/atomic_arm64.s b/src/runtime/atomic_arm64.s
index 4704aa6..21b4d8c 100644
--- a/src/runtime/atomic_arm64.s
+++ b/src/runtime/atomic_arm64.s
@@ -4,6 +4,6 @@
#include "textflag.h"
-TEXT ·publicationBarrier(SB),NOSPLIT,$-8-0
+TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
DMB $0xe // DMB ST
RET
diff --git a/src/runtime/cgo/asm_arm64.s b/src/runtime/cgo/asm_arm64.s
index 925e930..ce56f9b 100644
--- a/src/runtime/cgo/asm_arm64.s
+++ b/src/runtime/cgo/asm_arm64.s
@@ -7,7 +7,7 @@
// Called by C code generated by cmd/cgo.
// func crosscall2(fn func(a unsafe.Pointer, n int32, ctxt uintptr), a unsafe.Pointer, n int32, ctxt uintptr)
// Saves C callee-saved registers and calls fn with three arguments.
-TEXT crosscall2(SB),NOSPLIT,$-8
+TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
/*
* We still need to save all callee save register as before, and then
* push 3 args for fn (R1, R2, R3).
diff --git a/src/runtime/cgo/signal_darwin_arm64.s b/src/runtime/cgo/signal_darwin_arm64.s
index 17781cf..60443b6 100644
--- a/src/runtime/cgo/signal_darwin_arm64.s
+++ b/src/runtime/cgo/signal_darwin_arm64.s
@@ -10,7 +10,7 @@
//
// R1 - LR at moment of fault
// R2 - PC at moment of fault
-TEXT xx_cgo_panicmem(SB),NOSPLIT,$-8
+TEXT xx_cgo_panicmem(SB),NOSPLIT|NOFRAME,$0
// If in external C code, we need to load the g register.
BL runtime·load_g(SB)
CMP $0, g
diff --git a/src/runtime/duff_arm64.s b/src/runtime/duff_arm64.s
index 21619ff..54e6b99 100644
--- a/src/runtime/duff_arm64.s
+++ b/src/runtime/duff_arm64.s
@@ -4,7 +4,7 @@
#include "textflag.h"
-TEXT runtime·duffzero(SB), NOSPLIT, $-8-0
+TEXT runtime·duffzero(SB), NOSPLIT|NOFRAME, $0-0
STP.P (ZR, ZR), 16(R16)
STP.P (ZR, ZR), 16(R16)
STP.P (ZR, ZR), 16(R16)
diff --git a/src/runtime/memmove_arm64.s b/src/runtime/memmove_arm64.s
index 00813d4..42bdffc 100644
--- a/src/runtime/memmove_arm64.s
+++ b/src/runtime/memmove_arm64.s
@@ -5,7 +5,7 @@
#include "textflag.h"
// void runtime·memmove(void*, void*, uintptr)
-TEXT runtime·memmove(SB), NOSPLIT, $-8-24
+TEXT runtime·memmove(SB), NOSPLIT|NOFRAME, $0-24
MOVD to+0(FP), R3
MOVD from+8(FP), R4
MOVD n+16(FP), R5
diff --git a/src/runtime/mkduff.go b/src/runtime/mkduff.go
index fb7cbc2..dc7262f 100644
--- a/src/runtime/mkduff.go
+++ b/src/runtime/mkduff.go
@@ -153,7 +153,7 @@
// ZR: always zero
// R16 (aka REGRT1): ptr to memory to be zeroed
// On return, R16 points to the last zeroed dword.
- fmt.Fprintln(w, "TEXT runtime·duffzero(SB), NOSPLIT, $-8-0")
+ fmt.Fprintln(w, "TEXT runtime·duffzero(SB), NOSPLIT|NOFRAME, $0-0")
for i := 0; i < 63; i++ {
fmt.Fprintln(w, "\tSTP.P\t(ZR, ZR), 16(R16)")
}
diff --git a/src/runtime/rt0_android_arm64.s b/src/runtime/rt0_android_arm64.s
index 9378213..4135bf0 100644
--- a/src/runtime/rt0_android_arm64.s
+++ b/src/runtime/rt0_android_arm64.s
@@ -4,13 +4,13 @@
#include "textflag.h"
-TEXT _rt0_arm64_android(SB),NOSPLIT,$-8
+TEXT _rt0_arm64_android(SB),NOSPLIT|NOFRAME,$0
MOVD $_rt0_arm64_linux(SB), R4
B (R4)
// When building with -buildmode=c-shared, this symbol is called when the shared
// library is loaded.
-TEXT _rt0_arm64_android_lib(SB),NOSPLIT,$-8
+TEXT _rt0_arm64_android_lib(SB),NOSPLIT|NOFRAME,$0
MOVW $1, R0 // argc
MOVD $_rt0_arm64_android_argv(SB), R1 // **argv
MOVD $_rt0_arm64_linux_lib(SB), R4
diff --git a/src/runtime/rt0_darwin_arm64.s b/src/runtime/rt0_darwin_arm64.s
index f607683..960de06 100644
--- a/src/runtime/rt0_darwin_arm64.s
+++ b/src/runtime/rt0_darwin_arm64.s
@@ -6,7 +6,7 @@
// No need for _rt0_arm64_darwin as darwin/arm64 only
// supports external linking.
-TEXT _rt0_arm64_darwin(SB),NOSPLIT,$-8
+TEXT _rt0_arm64_darwin(SB),NOSPLIT|NOFRAME,$0
MOVD $42, R0
MOVD $1, R16 // SYS_exit
SVC $0x80
@@ -80,7 +80,7 @@
DATA _rt0_arm64_darwin_lib_argv<>(SB)/8, $0
GLOBL _rt0_arm64_darwin_lib_argv<>(SB),NOPTR, $8
-TEXT main(SB),NOSPLIT,$-8
+TEXT main(SB),NOSPLIT|NOFRAME,$0
MOVD $runtime·rt0_go(SB), R2
BL (R2)
exit:
diff --git a/src/runtime/rt0_linux_arm64.s b/src/runtime/rt0_linux_arm64.s
index d01d415..e81e598 100644
--- a/src/runtime/rt0_linux_arm64.s
+++ b/src/runtime/rt0_linux_arm64.s
@@ -4,7 +4,7 @@
#include "textflag.h"
-TEXT _rt0_arm64_linux(SB),NOSPLIT,$-8
+TEXT _rt0_arm64_linux(SB),NOSPLIT|NOFRAME,$0
MOVD 0(RSP), R0 // argc
ADD $8, RSP, R1 // argv
BL main(SB)
@@ -88,7 +88,7 @@
GLOBL _rt0_arm64_linux_lib_argv<>(SB),NOPTR, $8
-TEXT main(SB),NOSPLIT,$-8
+TEXT main(SB),NOSPLIT|NOFRAME,$0
MOVD $runtime·rt0_go(SB), R2
BL (R2)
exit:
diff --git a/src/runtime/sys_darwin_arm64.s b/src/runtime/sys_darwin_arm64.s
index 5663af5..831e6dd 100644
--- a/src/runtime/sys_darwin_arm64.s
+++ b/src/runtime/sys_darwin_arm64.s
@@ -79,7 +79,7 @@
MOVW R0, ret+24(FP)
RET
-TEXT runtime·exit(SB),NOSPLIT,$-8
+TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0
MOVW code+0(FP), R0
MOVW $SYS_exit, R16
SVC $0x80
diff --git a/src/runtime/sys_linux_arm64.s b/src/runtime/sys_linux_arm64.s
index 758e685..d8efc50 100644
--- a/src/runtime/sys_linux_arm64.s
+++ b/src/runtime/sys_linux_arm64.s
@@ -48,14 +48,14 @@
#define SYS_connect 203
#define SYS_brk 214
-TEXT runtime·exit(SB),NOSPLIT,$-8-4
+TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
MOVW code+0(FP), R0
MOVD $SYS_exit_group, R8
SVC
RET
// func exitThread(wait *uint32)
-TEXT runtime·exitThread(SB),NOSPLIT,$-8-8
+TEXT runtime·exitThread(SB),NOSPLIT|NOFRAME,$0-8
MOVD wait+0(FP), R0
// We're done using the stack.
MOVW $0, R1
@@ -65,7 +65,7 @@
SVC
JMP 0(PC)
-TEXT runtime·open(SB),NOSPLIT,$-8-20
+TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20
MOVD $AT_FDCWD, R0
MOVD name+0(FP), R1
MOVW mode+8(FP), R2
@@ -79,7 +79,7 @@
MOVW R0, ret+16(FP)
RET
-TEXT runtime·closefd(SB),NOSPLIT,$-8-12
+TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
MOVW fd+0(FP), R0
MOVD $SYS_close, R8
SVC
@@ -90,7 +90,7 @@
MOVW R0, ret+8(FP)
RET
-TEXT runtime·write(SB),NOSPLIT,$-8-28
+TEXT runtime·write(SB),NOSPLIT|NOFRAME,$0-28
MOVD fd+0(FP), R0
MOVD p+8(FP), R1
MOVW n+16(FP), R2
@@ -103,7 +103,7 @@
MOVW R0, ret+24(FP)
RET
-TEXT runtime·read(SB),NOSPLIT,$-8-28
+TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28
MOVW fd+0(FP), R0
MOVD p+8(FP), R1
MOVW n+16(FP), R2
@@ -116,7 +116,7 @@
MOVW R0, ret+24(FP)
RET
-TEXT runtime·getrlimit(SB),NOSPLIT,$-8-20
+TEXT runtime·getrlimit(SB),NOSPLIT|NOFRAME,$0-20
MOVW kind+0(FP), R0
MOVD limit+8(FP), R1
MOVD $SYS_getrlimit, R8
@@ -153,7 +153,7 @@
MOVW R0, ret+0(FP)
RET
-TEXT runtime·raise(SB),NOSPLIT,$-8
+TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0
MOVD $SYS_gettid, R8
SVC
MOVW R0, R0 // arg 1 tid
@@ -162,7 +162,7 @@
SVC
RET
-TEXT runtime·raiseproc(SB),NOSPLIT,$-8
+TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0
MOVD $SYS_getpid, R8
SVC
MOVW R0, R0 // arg 1 pid
@@ -171,7 +171,7 @@
SVC
RET
-TEXT runtime·setitimer(SB),NOSPLIT,$-8-24
+TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24
MOVW mode+0(FP), R0
MOVD new+8(FP), R1
MOVD old+16(FP), R2
@@ -179,7 +179,7 @@
SVC
RET
-TEXT runtime·mincore(SB),NOSPLIT,$-8-28
+TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
MOVD addr+0(FP), R0
MOVD n+8(FP), R1
MOVD dst+16(FP), R2
@@ -215,7 +215,7 @@
MOVD R3, ret+0(FP)
RET
-TEXT runtime·rtsigprocmask(SB),NOSPLIT,$-8-28
+TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
MOVW how+0(FP), R0
MOVD new+8(FP), R1
MOVD old+16(FP), R2
@@ -229,7 +229,7 @@
done:
RET
-TEXT runtime·rt_sigaction(SB),NOSPLIT,$-8-36
+TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36
MOVD sig+0(FP), R0
MOVD new+8(FP), R1
MOVD old+16(FP), R2
@@ -267,7 +267,7 @@
MOVD $runtime·sigtramp(SB), R3
B (R3)
-TEXT runtime·mmap(SB),NOSPLIT,$-8
+TEXT runtime·mmap(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R0
MOVD n+8(FP), R1
MOVW prot+16(FP), R2
@@ -288,7 +288,7 @@
MOVD $0, err+40(FP)
RET
-TEXT runtime·munmap(SB),NOSPLIT,$-8
+TEXT runtime·munmap(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R0
MOVD n+8(FP), R1
MOVD $SYS_munmap, R8
@@ -299,7 +299,7 @@
cool:
RET
-TEXT runtime·madvise(SB),NOSPLIT,$-8
+TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R0
MOVD n+8(FP), R1
MOVW flags+16(FP), R2
@@ -310,7 +310,7 @@
// int64 futex(int32 *uaddr, int32 op, int32 val,
// struct timespec *timeout, int32 *uaddr2, int32 val2);
-TEXT runtime·futex(SB),NOSPLIT,$-8
+TEXT runtime·futex(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R0
MOVW op+8(FP), R1
MOVW val+12(FP), R2
@@ -323,7 +323,7 @@
RET
// int64 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void));
-TEXT runtime·clone(SB),NOSPLIT,$-8
+TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0
MOVW flags+0(FP), R0
MOVD stk+8(FP), R1
@@ -391,7 +391,7 @@
SVC
B again // keep exiting
-TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
+TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
MOVD new+0(FP), R0
MOVD old+8(FP), R1
MOVD $SYS_sigaltstack, R8
@@ -403,12 +403,12 @@
ok:
RET
-TEXT runtime·osyield(SB),NOSPLIT,$-8
+TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
MOVD $SYS_sched_yield, R8
SVC
RET
-TEXT runtime·sched_getaffinity(SB),NOSPLIT,$-8
+TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
MOVD pid+0(FP), R0
MOVD len+8(FP), R1
MOVD buf+16(FP), R2
@@ -418,7 +418,7 @@
RET
// int32 runtime·epollcreate(int32 size);
-TEXT runtime·epollcreate(SB),NOSPLIT,$-8
+TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
MOVW $0, R0
MOVD $SYS_epoll_create1, R8
SVC
@@ -426,7 +426,7 @@
RET
// int32 runtime·epollcreate1(int32 flags);
-TEXT runtime·epollcreate1(SB),NOSPLIT,$-8
+TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
MOVW flags+0(FP), R0
MOVD $SYS_epoll_create1, R8
SVC
@@ -434,7 +434,7 @@
RET
// func epollctl(epfd, op, fd int32, ev *epollEvent) int
-TEXT runtime·epollctl(SB),NOSPLIT,$-8
+TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
MOVW epfd+0(FP), R0
MOVW op+4(FP), R1
MOVW fd+8(FP), R2
@@ -445,7 +445,7 @@
RET
// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
-TEXT runtime·epollwait(SB),NOSPLIT,$-8
+TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0
MOVW epfd+0(FP), R0
MOVD ev+8(FP), R1
MOVW nev+16(FP), R2
@@ -457,7 +457,7 @@
RET
// void runtime·closeonexec(int32 fd);
-TEXT runtime·closeonexec(SB),NOSPLIT,$-8
+TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R0 // fd
MOVD $2, R1 // F_SETFD
MOVD $1, R2 // FD_CLOEXEC
