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cmd/internal/obj, runtime: add NOFRAME flag to suppress stack frame set up on ppc64x

Browse source 
Replace the confusing game where a frame size of $-8 would suppress the
implicit setting up of a stack frame with a nice explicit flag.

The code to set up the function prologue is still a little confusing but better
than it was.

Change-Id: I1d49278ff42c6bc734ebfb079998b32bc53f8d9a
Reviewed-on: https://go-review.googlesource.com/15670
Reviewed-by: Minux Ma <minux@golang.org>
This commit is contained in:
Michael Hudson-Doyle 2015-10-09 12:44:27 +13:00
parent d0c9b40964
commit 45c06b27a4
14 changed files with 107 additions and 80 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
misc/cgo/test/issue9400/asm_ppc64x.s
View file

@ -7,7 +7,7 @@
#include "textflag.h"
TEXT ·RewindAndSetgid(SB),NOSPLIT,$-8-0
TEXT ·RewindAndSetgid(SB),NOSPLIT|NOFRAME,$0-0
// Rewind stack pointer so anything that happens on the stack
// will clobber the test pattern created by the caller
ADD $(1024 * 8), R1

2
src/cmd/internal/obj/ppc64/asm9.go
View file

@ -412,7 +412,7 @@ func span9(ctxt *obj.Link, cursym *obj.LSym) {
return
}
ctxt.Cursym = cursym
ctxt.Autosize = int32(p.To.Offset + 8)
ctxt.Autosize = int32(p.To.Offset)
if oprange[AANDN&obj.AMask].start == nil {
buildop(ctxt)

40
src/cmd/internal/obj/ppc64/obj9.go
View file

@ -124,6 +124,19 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
p := cursym.Text
textstksiz := p.To.Offset
if textstksiz == -8 {
// Compatibility hack.
p.From3.Offset |= obj.NOFRAME
textstksiz = 0
}
if textstksiz%8 != 0 {
ctxt.Diag("frame size %d not a multiple of 8", textstksiz)
}
if p.From3.Offset&obj.NOFRAME != 0 {
if textstksiz != 0 {
ctxt.Diag("NOFRAME functions must have a frame size of 0, not %d", textstksiz)
}
}
cursym.Args = p.To.Val.(int32)
cursym.Locals = int32(textstksiz)
@ -314,13 +327,20 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
case obj.ATEXT:
mov = AMOVD
aoffset = 0
autosize = int32(textstksiz + 8)
if (p.Mark&LEAF != 0) && autosize <= 8 {
autosize = 0
} else if autosize&4 != 0 {
autosize += 4
autosize = int32(textstksiz)
if p.Mark&LEAF != 0 && autosize == 0 && p.From3.Offset&obj.NOFRAME == 0 {
// A leaf function with no locals has no frame.
p.From3.Offset |= obj.NOFRAME
}
p.To.Offset = int64(autosize) - 8
if p.From3.Offset&obj.NOFRAME == 0 {
// If there is a stack frame at all, it includes
// space to save the LR.
autosize += 8
}
p.To.Offset = int64(autosize)
if p.From3.Offset&obj.NOSPLIT == 0 {
p = stacksplit(ctxt, p, autosize) // emit split check
@ -344,11 +364,9 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
q.Spadj = +autosize
}
} else if cursym.Text.Mark&LEAF == 0 {
if ctxt.Debugvlog != 0 {
fmt.Fprintf(ctxt.Bso, "save suppressed in: %s\n", cursym.Name)
ctxt.Bso.Flush()
}
// A very few functions that do not return to their caller
// (e.g. gogo) are not identified as leaves but still have
// no frame.
cursym.Text.Mark |= LEAF
}

5
src/cmd/internal/obj/textflag.go
View file

@ -39,4 +39,9 @@ const (
// Allocate a word of thread local storage and store the offset from the
// thread local base to the thread local storage in this variable.
TLSBSS = 256
// Do not insert instructions to allocate a stack frame for this function.
// Only valid on functions that declare a frame size of 0.
// TODO(mwhudson): only implemented for ppc64x at present.
NOFRAME = 512
)

52
src/runtime/asm_ppc64x.s
View file

@ -85,19 +85,19 @@ nocgo:
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,$0-0
MOVD R0, 2(R0) // TODO: TD
RET
TEXT runtime·asminit(SB),NOSPLIT,$-8-0
TEXT runtime·asminit(SB),NOSPLIT|NOFRAME,$0-0
RET
TEXT _cgo_reginit(SB),NOSPLIT,$-8-0
TEXT _cgo_reginit(SB),NOSPLIT|NOFRAME,$0-0
// crosscall_ppc64 and crosscall2 need to reginit, but can't
// get at the 'runtime.reginit' symbol.
BR runtime·reginit(SB)
TEXT runtime·reginit(SB),NOSPLIT,$-8-0
TEXT runtime·reginit(SB),NOSPLIT|NOFRAME,$0-0
// set R0 to zero, it's expected by the toolchain
XOR R0, R0
// initialize essential FP registers
@ -114,7 +114,7 @@ TEXT runtime·reginit(SB),NOSPLIT,$-8-0
// 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 R1, gobuf_sp(R3)
MOVD LR, R31
@ -127,7 +127,7 @@ TEXT runtime·gosave(SB), NOSPLIT, $-8-8
// void gogo(Gobuf*)
// restore state from Gobuf; longjmp
TEXT runtime·gogo(SB), NOSPLIT, $-8-8
TEXT runtime·gogo(SB), NOSPLIT|NOFRAME, $0-8
MOVD buf+0(FP), R5
MOVD gobuf_g(R5), g // make sure g is not nil
BL runtime·save_g(SB)
@ -151,7 +151,7 @@ TEXT runtime·gogo(SB), NOSPLIT, $-8-8
// 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, $0-8
// Save caller state in g->sched
MOVD R1, (g_sched+gobuf_sp)(g)
MOVD LR, R31
@ -262,7 +262,7 @@ noswitch:
// the top of a stack (for example, morestack calling newstack
// calling the scheduler calling newm calling gc), so we must
// record an argument size. For that purpose, it has no arguments.
TEXT runtime·morestack(SB),NOSPLIT,$-8-0
TEXT runtime·morestack(SB),NOSPLIT|NOFRAME,$0-0
// Cannot grow scheduler stack (m->g0).
MOVD g_m(g), R7
MOVD m_g0(R7), R8
@ -300,7 +300,7 @@ TEXT runtime·morestack(SB),NOSPLIT,$-8-0
// 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
MOVD R0, R11
BR runtime·morestack(SB)
@ -340,7 +340,7 @@ TEXT runtime·stackBarrier(SB),NOSPLIT,$0
TEXT reflect·call(SB), NOSPLIT, $0-0
BR ·reflectcall(SB)
TEXT ·reflectcall(SB), NOSPLIT, $-8-32
TEXT ·reflectcall(SB), NOSPLIT|NOFRAME, $0-32
MOVWZ argsize+24(FP), R3
// NOTE(rsc): No call16, because CALLFN needs four words
// of argument space to invoke callwritebarrier.
@ -511,10 +511,10 @@ cas64_fail:
TEXT runtime·casuintptr(SB), NOSPLIT, $0-25
BR runtime·cas64(SB)
TEXT runtime·atomicloaduintptr(SB), NOSPLIT, $-8-16
TEXT runtime·atomicloaduintptr(SB), NOSPLIT|NOFRAME, $0-16
BR runtime·atomicload64(SB)
TEXT runtime·atomicloaduint(SB), NOSPLIT, $-8-16
TEXT runtime·atomicloaduint(SB), NOSPLIT|NOFRAME, $0-16
BR runtime·atomicload64(SB)
TEXT runtime·atomicstoreuintptr(SB), NOSPLIT, $0-16
@ -669,7 +669,7 @@ again:
// 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(R1), R31
SUB $4, R31
MOVD R31, LR
@ -682,7 +682,7 @@ TEXT runtime·jmpdefer(SB), NOSPLIT, $-8-16
BR (CTR)
// Save state of caller into g->sched. Smashes R31.
TEXT gosave<>(SB),NOSPLIT,$-8
TEXT gosave<>(SB),NOSPLIT|NOFRAME,$0
MOVD LR, R31
MOVD R31, (g_sched+gobuf_pc)(g)
MOVD R1, (g_sched+gobuf_sp)(g)
@ -873,7 +873,7 @@ TEXT runtime·setg(SB), NOSPLIT, $0-8
// void setg_gcc(G*); set g in C TLS.
// Must obey the gcc calling convention.
TEXT setg_gcc<>(SB),NOSPLIT,$-8-0
TEXT setg_gcc<>(SB),NOSPLIT|NOFRAME,$0-0
// The standard prologue clobbers R31, which is callee-save in
// the C ABI, so we have to use $-8-0 and save LR ourselves.
MOVD LR, R4
@ -921,7 +921,7 @@ TEXT runtime·getcallersp(SB),NOSPLIT,$0-16
MOVD R3, ret+8(FP)
RET
TEXT runtime·abort(SB),NOSPLIT,$-8-0
TEXT runtime·abort(SB),NOSPLIT|NOFRAME,$0-0
MOVW (R0), R0
UNDEF
@ -958,16 +958,16 @@ TEXT runtime·memhash_varlen(SB),NOSPLIT,$40-24
RET
// AES hashing not implemented for ppc64
TEXT runtime·aeshash(SB),NOSPLIT,$-8-0
TEXT runtime·aeshash(SB),NOSPLIT|NOFRAME,$0-0
MOVW (R0), R1
TEXT runtime·aeshash32(SB),NOSPLIT,$-8-0
TEXT runtime·aeshash32(SB),NOSPLIT|NOFRAME,$0-0
MOVW (R0), R1
TEXT runtime·aeshash64(SB),NOSPLIT,$-8-0
TEXT runtime·aeshash64(SB),NOSPLIT|NOFRAME,$0-0
MOVW (R0), R1
TEXT runtime·aeshashstr(SB),NOSPLIT,$-8-0
TEXT runtime·aeshashstr(SB),NOSPLIT|NOFRAME,$0-0
MOVW (R0), R1
TEXT runtime·memeq(SB),NOSPLIT,$-8-25
TEXT runtime·memeq(SB),NOSPLIT|NOFRAME,$0-25
MOVD a+0(FP), R3
MOVD b+8(FP), R4
MOVD size+16(FP), R5
@ -1115,7 +1115,7 @@ notfound:
MOVD R3, ret+24(FP)
RET
TEXT runtime·cmpstring(SB),NOSPLIT,$-4-40
TEXT runtime·cmpstring(SB),NOSPLIT|NOFRAME,$0-40
MOVD s1_base+0(FP), R5
MOVD s1_len+8(FP), R3
MOVD s2_base+16(FP), R6
@ -1123,7 +1123,7 @@ TEXT runtime·cmpstring(SB),NOSPLIT,$-4-40
MOVD $ret+32(FP), R7
BR runtime·cmpbody<>(SB)
TEXT bytes·Compare(SB),NOSPLIT,$-4-56
TEXT bytes·Compare(SB),NOSPLIT|NOFRAME,$0-56
MOVD s1+0(FP), R5
MOVD s1+8(FP), R3
MOVD s2+24(FP), R6
@ -1140,7 +1140,7 @@ TEXT bytes·Compare(SB),NOSPLIT,$-4-56
//
// On exit:
// R5, R6, R8, R9 and R10 are clobbered
TEXT runtime·cmpbody<>(SB),NOSPLIT,$-4-0
TEXT runtime·cmpbody<>(SB),NOSPLIT|NOFRAME,$0-0
CMP R5, R6
BEQ samebytes // same starting pointers; compare lengths
SUB $1, R5
@ -1191,7 +1191,7 @@ TEXT runtime·return0(SB), NOSPLIT, $0
// Called from cgo wrappers, this function returns g->m->curg.stack.hi.
// Must obey the gcc calling convention.
TEXT _cgo_topofstack(SB),NOSPLIT,$-8
TEXT _cgo_topofstack(SB),NOSPLIT|NOFRAME,$0
// g (R30) and R31 are callee-save in the C ABI, so save them
MOVD g, R4
MOVD R31, R5
@ -1209,7 +1209,7 @@ TEXT _cgo_topofstack(SB),NOSPLIT,$-8
// 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
// traceback from goexit1 must hit code range of goexit

8
src/runtime/atomic_ppc64x.s
View file

@ -7,7 +7,7 @@
#include "textflag.h"
// uint32 runtime·atomicload(uint32 volatile* addr)
TEXT ·atomicload(SB),NOSPLIT,$-8-12
TEXT ·atomicload(SB),NOSPLIT|NOFRAME,$0-12
MOVD addr+0(FP), R3
SYNC
MOVWZ 0(R3), R3
@ -18,7 +18,7 @@ TEXT ·atomicload(SB),NOSPLIT,$-8-12
RET
// uint64 runtime·atomicload64(uint64 volatile* addr)
TEXT ·atomicload64(SB),NOSPLIT,$-8-16
TEXT ·atomicload64(SB),NOSPLIT|NOFRAME,$0-16
MOVD addr+0(FP), R3
SYNC
MOVD 0(R3), R3
@ -29,7 +29,7 @@ TEXT ·atomicload64(SB),NOSPLIT,$-8-16
RET
// void *runtime·atomicloadp(void *volatile *addr)
TEXT ·atomicloadp(SB),NOSPLIT,$-8-16
TEXT ·atomicloadp(SB),NOSPLIT|NOFRAME,$0-16
MOVD addr+0(FP), R3
SYNC
MOVD 0(R3), R3
@ -39,7 +39,7 @@ TEXT ·atomicloadp(SB),NOSPLIT,$-8-16
MOVD R3, ret+8(FP)
RET
TEXT ·publicationBarrier(SB),NOSPLIT,$-8-0
TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
// LWSYNC is the "export" barrier recommended by Power ISA
// v2.07 book II, appendix B.2.2.2.
// LWSYNC is a load/load, load/store, and store/store barrier.

6
src/runtime/cgo/asm_ppc64x.s
View file

@ -11,7 +11,7 @@
* Save registers and call fn with two arguments.
* crosscall2 obeys the C ABI; fn obeys the Go ABI.
*/
TEXT crosscall2(SB),NOSPLIT,$-8
TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
// TODO(austin): ABI v1 (fn is probably a function descriptor)
// Start with standard C stack frame layout and linkage
@ -41,7 +41,7 @@ TEXT crosscall2(SB),NOSPLIT,$-8
MOVD R0, LR
RET
TEXT saveregs2<>(SB),NOSPLIT,$-8
TEXT saveregs2<>(SB),NOSPLIT|NOFRAME,$0
// O=-288; for R in R{14..31}; do echo "\tMOVD\t$R, $O(R1)"|sed s/R30/g/; ((O+=8)); done; for F in F{14..31}; do echo "\tFMOVD\t$F, $O(R1)"; ((O+=8)); done
MOVD R14, -288(R1)
MOVD R15, -280(R1)
@ -82,7 +82,7 @@ TEXT saveregs2<>(SB),NOSPLIT,$-8
RET
TEXT restoreregs2<>(SB),NOSPLIT,$-8
TEXT restoreregs2<>(SB),NOSPLIT|NOFRAME,$0
// O=-288; for R in R{14..31}; do echo "\tMOVD\t$O(R1), $R"|sed s/R30/g/; ((O+=8)); done; for F in F{14..31}; do echo "\tFMOVD\t$O(R1), $F"; ((O+=8)); done
MOVD -288(R1), R14
MOVD -280(R1), R15

2
src/runtime/duff_ppc64x.s
View file

@ -6,7 +6,7 @@
#include "textflag.h"
TEXT runtime·duffzero(SB), NOSPLIT, $-8-0
TEXT runtime·duffzero(SB), NOSPLIT|NOFRAME, $0-0
MOVDU R0, 8(R3)
MOVDU R0, 8(R3)
MOVDU R0, 8(R3)

2
src/runtime/memclr_ppc64x.s
View file

@ -7,7 +7,7 @@
#include "textflag.h"
// void runtime·memclr(void*, uintptr)
TEXT runtime·memclr(SB),NOSPLIT,$0-16
TEXT runtime·memclr(SB),NOSPLIT|NOFRAME,$0-16
MOVD ptr+0(FP), R3
MOVD n+8(FP), R4
SRADCC $3, R4, R6 // R6 is the number of words to zero

2
src/runtime/memmove_ppc64x.s
View file

@ -7,7 +7,7 @@
#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

4
src/runtime/mkduff.go
View file

@ -173,11 +173,11 @@ func zeroPPC64x(w io.Writer) {
// R0: always zero
// R3 (aka REGRT1): ptr to memory to be zeroed - 8
// On return, R3 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 < 128; i++ {
fmt.Fprintln(w, "\tMOVDU\tR0, 8(R3)")
}
fmt.Fprintln(w, "\tRETURN")
fmt.Fprintln(w, "\tRET")
}
func copyPPC64x(w io.Writer) {

54
src/runtime/sys_linux_ppc64x.s
View file

@ -47,17 +47,17 @@
#define SYS_clock_gettime 246
#define SYS_epoll_create1 315
TEXT runtime·exit(SB),NOSPLIT,$-8-4
TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
MOVW code+0(FP), R3
SYSCALL $SYS_exit_group
RET
TEXT runtime·exit1(SB),NOSPLIT,$-8-4
TEXT runtime·exit1(SB),NOSPLIT|NOFRAME,$0-4
MOVW code+0(FP), R3
SYSCALL $SYS_exit
RET
TEXT runtime·open(SB),NOSPLIT,$-8-20
TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20
MOVD name+0(FP), R3
MOVW mode+8(FP), R4
MOVW perm+12(FP), R5
@ -67,7 +67,7 @@ TEXT runtime·open(SB),NOSPLIT,$-8-20
MOVW R3, ret+16(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT,$-8-12
TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
MOVW fd+0(FP), R3
SYSCALL $SYS_close
BVC 2(PC)
@ -75,7 +75,7 @@ TEXT runtime·closefd(SB),NOSPLIT,$-8-12
MOVW R3, ret+8(FP)
RET
TEXT runtime·write(SB),NOSPLIT,$-8-28
TEXT runtime·write(SB),NOSPLIT|NOFRAME,$0-28
MOVD fd+0(FP), R3
MOVD p+8(FP), R4
MOVW n+16(FP), R5
@ -85,7 +85,7 @@ TEXT runtime·write(SB),NOSPLIT,$-8-28
MOVW R3, ret+24(FP)
RET
TEXT runtime·read(SB),NOSPLIT,$-8-28
TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28
MOVW fd+0(FP), R3
MOVD p+8(FP), R4
MOVW n+16(FP), R5
@ -95,7 +95,7 @@ TEXT runtime·read(SB),NOSPLIT,$-8-28
MOVW R3, ret+24(FP)
RET
TEXT runtime·getrlimit(SB),NOSPLIT,$-8-20
TEXT runtime·getrlimit(SB),NOSPLIT|NOFRAME,$0-20
MOVW kind+0(FP), R3
MOVD limit+8(FP), R4
SYSCALL $SYS_ugetrlimit
@ -126,28 +126,28 @@ TEXT runtime·gettid(SB),NOSPLIT,$0-4
MOVW R3, ret+0(FP)
RET
TEXT runtime·raise(SB),NOSPLIT,$-8
TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0
SYSCALL $SYS_gettid
MOVW R3, R3 // arg 1 tid
MOVW sig+0(FP), R4 // arg 2
SYSCALL $SYS_tkill
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$-8
TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0
SYSCALL $SYS_getpid
MOVW R3, R3 // arg 1 pid
MOVW sig+0(FP), R4 // arg 2
SYSCALL $SYS_kill
RET
TEXT runtime·setitimer(SB),NOSPLIT,$-8-24
TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24
MOVW mode+0(FP), R3
MOVD new+8(FP), R4
MOVD old+16(FP), R5
SYSCALL $SYS_setitimer
RET
TEXT runtime·mincore(SB),NOSPLIT,$-8-28
TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
MOVD addr+0(FP), R3
MOVD n+8(FP), R4
MOVD dst+16(FP), R5
@ -182,7 +182,7 @@ TEXT runtime·nanotime(SB),NOSPLIT,$16
MOVD R3, ret+0(FP)
RET
TEXT runtime·rtsigprocmask(SB),NOSPLIT,$-8-28
TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
MOVW sig+0(FP), R3
MOVD new+8(FP), R4
MOVD old+16(FP), R5
@ -192,7 +192,7 @@ TEXT runtime·rtsigprocmask(SB),NOSPLIT,$-8-28
MOVD R0, 0xf1(R0) // crash
RET
TEXT runtime·rt_sigaction(SB),NOSPLIT,$-8-36
TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36
MOVD sig+0(FP), R3
MOVD new+8(FP), R4
MOVD old+16(FP), R5
@ -215,7 +215,7 @@ TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
TEXT runtime·sigtramp(SB),NOSPLIT,$64
#else
// function descriptor for the real sigtramp
TEXT runtime·sigtramp(SB),NOSPLIT,$-8
TEXT runtime·sigtramp(SB),NOSPLIT|NOFRAME,$0
DWORD $runtime·_sigtramp(SB)
DWORD $0
DWORD $0
@ -239,7 +239,7 @@ TEXT runtime·_sigtramp(SB),NOSPLIT,$64
BL (CTR)
RET
TEXT runtime·mmap(SB),NOSPLIT,$-8
TEXT runtime·mmap(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R3
MOVD n+8(FP), R4
MOVW prot+16(FP), R5
@ -251,7 +251,7 @@ TEXT runtime·mmap(SB),NOSPLIT,$-8
MOVD R3, ret+32(FP)
RET
TEXT runtime·munmap(SB),NOSPLIT,$-8
TEXT runtime·munmap(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R3
MOVD n+8(FP), R4
SYSCALL $SYS_munmap
@ -259,7 +259,7 @@ TEXT runtime·munmap(SB),NOSPLIT,$-8
MOVD R0, 0xf3(R0)
RET
TEXT runtime·madvise(SB),NOSPLIT,$-8
TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R3
MOVD n+8(FP), R4
MOVW flags+16(FP), R5
@ -269,7 +269,7 @@ TEXT runtime·madvise(SB),NOSPLIT,$-8
// 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,$0
MOVD addr+0(FP), R3
MOVW op+8(FP), R4
MOVW val+12(FP), R5
@ -281,7 +281,7 @@ TEXT runtime·futex(SB),NOSPLIT,$-8
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), R3
MOVD stk+8(FP), R4
@ -344,7 +344,7 @@ nog:
SYSCALL $SYS_exit
BR -2(PC) // keep exiting
TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
MOVD new+0(FP), R3
MOVD old+8(FP), R4
SYSCALL $SYS_sigaltstack
@ -352,11 +352,11 @@ TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
MOVD R0, 0xf1(R0) // crash
RET
TEXT runtime·osyield(SB),NOSPLIT,$-8
TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
SYSCALL $SYS_sched_yield
RET
TEXT runtime·sched_getaffinity(SB),NOSPLIT,$-8
TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
MOVD pid+0(FP), R3
MOVD len+8(FP), R4
MOVD buf+16(FP), R5
@ -365,21 +365,21 @@ TEXT runtime·sched_getaffinity(SB),NOSPLIT,$-8
RET
// int32 runtime·epollcreate(int32 size);
TEXT runtime·epollcreate(SB),NOSPLIT,$-8
TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
MOVW size+0(FP), R3
SYSCALL $SYS_epoll_create
MOVW R3, ret+8(FP)
RET
// int32 runtime·epollcreate1(int32 flags);
TEXT runtime·epollcreate1(SB),NOSPLIT,$-8
TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
MOVW flags+0(FP), R3
SYSCALL $SYS_epoll_create1
MOVW R3, ret+8(FP)
RET
// func epollctl(epfd, op, fd int32, ev *epollEvent) int
TEXT runtime·epollctl(SB),NOSPLIT,$-8
TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
MOVW epfd+0(FP), R3
MOVW op+4(FP), R4
MOVW fd+8(FP), R5
@ -389,7 +389,7 @@ TEXT runtime·epollctl(SB),NOSPLIT,$-8
RET
// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
TEXT runtime·epollwait(SB),NOSPLIT,$-8
TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0
MOVW epfd+0(FP), R3
MOVD ev+8(FP), R4
MOVW nev+16(FP), R5
@ -399,7 +399,7 @@ TEXT runtime·epollwait(SB),NOSPLIT,$-8
RET
// void runtime·closeonexec(int32 fd);
TEXT runtime·closeonexec(SB),NOSPLIT,$-8
TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R3 // fd
MOVD $2, R4 // F_SETFD
MOVD $1, R5 // FD_CLOEXEC

4
src/runtime/textflag.h
View file

@ -24,3 +24,7 @@
// Allocate a word of thread local storage and store the offset from the
// thread local base to the thread local storage in this variable.
#define TLSBSS 256
// Do not insert instructions to allocate a stack frame for this function.
// Only valid on functions that declare a frame size of 0.
// TODO(mwhudson): only implemented for ppc64x at present.
#define NOFRAME 512

4
src/runtime/tls_ppc64x.s
View file

@ -22,7 +22,7 @@
// If !iscgo, this is a no-op.
//
// NOTE: setg_gcc<> assume this clobbers only R31.
TEXT runtime·save_g(SB),NOSPLIT,$-8-0
TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0-0
MOVB runtime·iscgo(SB), R31
CMP R31, $0
BEQ nocgo
@ -50,7 +50,7 @@ nocgo:
// usual Go registers aren't set up.
//
// NOTE: _cgo_topofstack assumes this only clobbers g (R30), and R31.
TEXT runtime·load_g(SB),NOSPLIT,$-8-0
TEXT runtime·load_g(SB),NOSPLIT|NOFRAME,$0-0
MOVD $runtime·tls_g(SB), R31
// R13 is the C ABI TLS base pointer + 0x7000
ADD R13, R31