mirror of
https://github.com/golang/go
synced 2024-11-23 22:00:11 -07:00
cmd/link: generate PPC64 ABI register save/restore functions if needed
They are usually needed when internally linking gcc code compiled with -Os. These are typically generated by ld or gold, but are missing when linking internally. The PPC64 ELF ABI describes a set of functions to save/restore non-volatile, callee-save registers using R1/R0/R12: _savegpr0_n: Save Rn-R31 relative to R1, save LR (in R0), return _restgpr0_n: Restore Rn-R31 from R1, and return to saved LR _savefpr_n: Save Fn-F31 based on R1, and save LR (in R0), return _restfpr_n: Restore Fn-F31 from R1, and return to 16(R1) _savegpr1_n: Save Rn-R31 based on R12, return _restgpr1_n: Restore Rn-R31 based on R12, return _savevr_m: Save VRm-VR31 based on R0, R12 is scratch, return _restvr_m: Restore VRm-VR31 based on R0, R12 is scratch, return m is a value 20<=m<=31 n is a value 14<=n<=31 Add several new functions similar to those suggested by the PPC64 ELFv2 ABI. And update the linker to scan external relocs for these calls, and redirect them to runtime.elf_<func>+offset in runtime/asm_ppc64x.go. Similarly, code which generates plt stubs is moved into a dedicated function. This avoids an extra scan of relocs. fixes #52336 Change-Id: I2f0f8b5b081a7b294dff5c92b4b1db8eba9a9400 Reviewed-on: https://go-review.googlesource.com/c/go/+/400796 Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: David Chase <drchase@google.com> Run-TryBot: Paul Murphy <murp@ibm.com> TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Paul E. Murphy
Paul Murphy
parent
4a5711c3cf
commit
9c9090eb1d
49
src/cmd/go/testdata/script/test_ppc64_linker_funcs.txt
vendored
Normal file
49
src/cmd/go/testdata/script/test_ppc64_linker_funcs.txt
vendored
Normal file
@ -0,0 +1,49 @@
|
||||
# Tests that the linker implements the PPC64 ELFv2 ABI
|
||||
# register save and restore functions as defined in
|
||||
# section 2.3.3.1 of the PPC64 ELFv2 ABI when linking
|
||||
# external objects most likely compiled with gcc's
|
||||
# -Os option.
|
||||
#
|
||||
# Verifies golang.org/issue/52366 for linux/ppc64le
|
||||
[!linux] skip
|
||||
[!gc] skip
|
||||
[!cgo] skip
|
||||
[!ppc64le] skip
|
||||
|
||||
go build -ldflags='-linkmode=internal'
|
||||
exec ./abitest
|
||||
stdout success
|
||||
|
||||
-- go.mod --
|
||||
module abitest
|
||||
|
||||
-- abitest.go --
|
||||
package main
|
||||
|
||||
/*
|
||||
#cgo CFLAGS: -Os
|
||||
|
||||
int foo_fpr() {
|
||||
asm volatile("":::"fr31","fr30","fr29","fr28");
|
||||
}
|
||||
int foo_gpr0() {
|
||||
asm volatile("":::"r30","r29","r28");
|
||||
}
|
||||
int foo_gpr1() {
|
||||
asm volatile("":::"fr31", "fr30","fr29","fr28","r30","r29","r28");
|
||||
}
|
||||
int foo_vr() {
|
||||
asm volatile("":::"v31","v30","v29","v28");
|
||||
}
|
||||
*/
|
||||
import "C"
|
||||
|
||||
import "fmt"
|
||||
|
||||
func main() {
|
||||
C.foo_fpr()
|
||||
C.foo_gpr0()
|
||||
C.foo_gpr1()
|
||||
C.foo_vr()
|
||||
fmt.Println("success")
|
||||
}
|
||||
@ -40,10 +40,11 @@ import (
|
||||
"encoding/binary"
|
||||
"fmt"
|
||||
"log"
|
||||
"strconv"
|
||||
"strings"
|
||||
)
|
||||
|
||||
func genplt(ctxt *ld.Link, ldr *loader.Loader) {
|
||||
func genpltstub(ctxt *ld.Link, ldr *loader.Loader, r loader.Reloc, s loader.Sym) (sym loader.Sym, firstUse bool) {
|
||||
// The ppc64 ABI PLT has similar concepts to other
|
||||
// architectures, but is laid out quite differently. When we
|
||||
// see an R_PPC64_REL24 relocation to a dynamic symbol
|
||||
@ -92,53 +93,82 @@ func genplt(ctxt *ld.Link, ldr *loader.Loader) {
|
||||
//
|
||||
// This assumes "case 1" from the ABI, where the caller needs
|
||||
// us to save and restore the TOC pointer.
|
||||
|
||||
// Reserve PLT entry and generate symbol
|
||||
// resolver
|
||||
addpltsym(ctxt, ldr, r.Sym())
|
||||
|
||||
// Generate call stub. Important to note that we're looking
|
||||
// up the stub using the same version as the parent symbol (s),
|
||||
// needed so that symtoc() will select the right .TOC. symbol
|
||||
// when processing the stub. In older versions of the linker
|
||||
// this was done by setting stub.Outer to the parent, but
|
||||
// if the stub has the right version initially this is not needed.
|
||||
n := fmt.Sprintf("%s.%s", ldr.SymName(s), ldr.SymName(r.Sym()))
|
||||
stub := ldr.CreateSymForUpdate(n, ldr.SymVersion(s))
|
||||
firstUse = stub.Size() == 0
|
||||
if firstUse {
|
||||
gencallstub(ctxt, ldr, 1, stub, r.Sym())
|
||||
}
|
||||
|
||||
// Update the relocation to use the call stub
|
||||
r.SetSym(stub.Sym())
|
||||
|
||||
// Make the symbol writeable so we can fixup toc.
|
||||
su := ldr.MakeSymbolUpdater(s)
|
||||
su.MakeWritable()
|
||||
p := su.Data()
|
||||
|
||||
// Check for toc restore slot (a nop), and replace with toc restore.
|
||||
var nop uint32
|
||||
if len(p) >= int(r.Off()+8) {
|
||||
nop = ctxt.Arch.ByteOrder.Uint32(p[r.Off()+4:])
|
||||
}
|
||||
if nop != 0x60000000 {
|
||||
ldr.Errorf(s, "Symbol %s is missing toc restoration slot at offset %d", ldr.SymName(s), r.Off()+4)
|
||||
}
|
||||
const o1 = 0xe8410018 // ld r2,24(r1)
|
||||
ctxt.Arch.ByteOrder.PutUint32(p[r.Off()+4:], o1)
|
||||
|
||||
return stub.Sym(), firstUse
|
||||
}
|
||||
|
||||
// Scan relocs and generate PLT stubs and generate/fixup ABI defined functions created by the linker
|
||||
func genstubs(ctxt *ld.Link, ldr *loader.Loader) {
|
||||
var stubs []loader.Sym
|
||||
var abifuncs []loader.Sym
|
||||
for _, s := range ctxt.Textp {
|
||||
relocs := ldr.Relocs(s)
|
||||
for i := 0; i < relocs.Count(); i++ {
|
||||
r := relocs.At(i)
|
||||
if r.Type() != objabi.ElfRelocOffset+objabi.RelocType(elf.R_PPC64_REL24) || ldr.SymType(r.Sym()) != sym.SDYNIMPORT {
|
||||
continue
|
||||
if r := relocs.At(i); r.Type() == objabi.ElfRelocOffset+objabi.RelocType(elf.R_PPC64_REL24) {
|
||||
switch ldr.SymType(r.Sym()) {
|
||||
case sym.SDYNIMPORT:
|
||||
// This call goes throught the PLT, generate and call through a PLT stub.
|
||||
if sym, firstUse := genpltstub(ctxt, ldr, r, s); firstUse {
|
||||
stubs = append(stubs, sym)
|
||||
}
|
||||
|
||||
case sym.SXREF:
|
||||
// Is this an ELF ABI defined function which is (in practice)
|
||||
// generated by the linker to save/restore callee save registers?
|
||||
// These are defined similarly for both PPC64 ELF and ELFv2.
|
||||
targName := ldr.SymName(r.Sym())
|
||||
if strings.HasPrefix(targName, "_save") || strings.HasPrefix(targName, "_rest") {
|
||||
if sym, firstUse := rewriteABIFuncReloc(ctxt, ldr, targName, r); firstUse {
|
||||
abifuncs = append(abifuncs, sym)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Reserve PLT entry and generate symbol
|
||||
// resolver
|
||||
addpltsym(ctxt, ldr, r.Sym())
|
||||
|
||||
// Generate call stub. Important to note that we're looking
|
||||
// up the stub using the same version as the parent symbol (s),
|
||||
// needed so that symtoc() will select the right .TOC. symbol
|
||||
// when processing the stub. In older versions of the linker
|
||||
// this was done by setting stub.Outer to the parent, but
|
||||
// if the stub has the right version initially this is not needed.
|
||||
n := fmt.Sprintf("%s.%s", ldr.SymName(s), ldr.SymName(r.Sym()))
|
||||
stub := ldr.CreateSymForUpdate(n, ldr.SymVersion(s))
|
||||
if stub.Size() == 0 {
|
||||
stubs = append(stubs, stub.Sym())
|
||||
gencallstub(ctxt, ldr, 1, stub, r.Sym())
|
||||
}
|
||||
|
||||
// Update the relocation to use the call stub
|
||||
r.SetSym(stub.Sym())
|
||||
|
||||
// Make the symbol writeable so we can fixup toc.
|
||||
su := ldr.MakeSymbolUpdater(s)
|
||||
su.MakeWritable()
|
||||
p := su.Data()
|
||||
|
||||
// Check for toc restore slot (a nop), and replace with toc restore.
|
||||
var nop uint32
|
||||
if len(p) >= int(r.Off()+8) {
|
||||
nop = ctxt.Arch.ByteOrder.Uint32(p[r.Off()+4:])
|
||||
}
|
||||
if nop != 0x60000000 {
|
||||
ldr.Errorf(s, "Symbol %s is missing toc restoration slot at offset %d", ldr.SymName(s), r.Off()+4)
|
||||
}
|
||||
const o1 = 0xe8410018 // ld r2,24(r1)
|
||||
ctxt.Arch.ByteOrder.PutUint32(p[r.Off()+4:], o1)
|
||||
}
|
||||
}
|
||||
// Put call stubs at the beginning (instead of the end).
|
||||
|
||||
// Append any usage of the go versions of ELF save/restore
|
||||
// functions to the end of the callstub list to minimize
|
||||
// chances a trampoline might be needed.
|
||||
stubs = append(stubs, abifuncs...)
|
||||
|
||||
// Put stubs at the beginning (instead of the end).
|
||||
// So when resolving the relocations to calls to the stubs,
|
||||
// the addresses are known and trampolines can be inserted
|
||||
// when necessary.
|
||||
@ -202,13 +232,74 @@ func genaddmoduledata(ctxt *ld.Link, ldr *loader.Loader) {
|
||||
o(0x4e800020)
|
||||
}
|
||||
|
||||
// Rewrite ELF (v1 or v2) calls to _savegpr0_n, _savegpr1_n, _savefpr_n, _restfpr_n, _savevr_m, or
|
||||
// _restvr_m (14<=n<=31, 20<=m<=31). Redirect them to runtime.elf_restgpr0+(n-14)*4,
|
||||
// runtime.elf_restvr+(m-20)*8, and similar.
|
||||
//
|
||||
// These functions are defined in the ELFv2 ABI (generated when using gcc -Os option) to save and
|
||||
// restore callee-saved registers (as defined in the PPC64 ELF ABIs) from registers n or m to 31 of
|
||||
// the named type. R12 and R0 are sometimes used in exceptional ways described in the ABI.
|
||||
//
|
||||
// Final note, this is only needed when linking internally. The external linker will generate these
|
||||
// functions if they are used.
|
||||
func rewriteABIFuncReloc(ctxt *ld.Link, ldr *loader.Loader, tname string, r loader.Reloc) (sym loader.Sym, firstUse bool) {
|
||||
s := strings.Split(tname, "_")
|
||||
// A valid call will split like {"", "savegpr0", "20"}
|
||||
if len(s) != 3 {
|
||||
return 0, false // Not an abi func.
|
||||
}
|
||||
minReg := 14 // _savegpr0_{n}, _savegpr1_{n}, _savefpr_{n}, 14 <= n <= 31
|
||||
offMul := 4 // 1 instruction per register op.
|
||||
switch s[1] {
|
||||
case "savegpr0", "savegpr1", "savefpr":
|
||||
case "restgpr0", "restgpr1", "restfpr":
|
||||
case "savevr", "restvr":
|
||||
minReg = 20 // _savevr_{n} or _restvr_{n}, 20 <= n <= 31
|
||||
offMul = 8 // 2 instructions per register op.
|
||||
default:
|
||||
return 0, false // Not an abi func
|
||||
}
|
||||
n, e := strconv.Atoi(s[2])
|
||||
if e != nil || n < minReg || n > 31 || r.Add() != 0 {
|
||||
return 0, false // Invalid register number, or non-zero addend. Not an abi func.
|
||||
}
|
||||
|
||||
// tname is a valid relocation to an ABI defined register save/restore function. Re-relocate
|
||||
// them to a go version of these functions in runtime/asm_ppc64x.s
|
||||
ts := ldr.LookupOrCreateSym("runtime.elf_"+s[1], 0)
|
||||
r.SetSym(ts)
|
||||
r.SetAdd(int64((n - minReg) * offMul))
|
||||
firstUse = !ldr.AttrReachable(ts)
|
||||
if firstUse {
|
||||
ldr.SetAttrReachable(ts, true)
|
||||
// This function only becomes reachable now. It has been dropped from
|
||||
// the text section (it was unreachable until now), it needs included.
|
||||
//
|
||||
// Similarly, TOC regeneration should not happen for these functions,
|
||||
// remove it from this save/restore function.
|
||||
if ldr.AttrShared(ts) {
|
||||
sb := ldr.MakeSymbolUpdater(ts)
|
||||
sb.SetData(sb.Data()[8:])
|
||||
sb.SetSize(sb.Size() - 8)
|
||||
relocs := sb.Relocs()
|
||||
// Only one PCREL reloc to .TOC. should be present.
|
||||
if relocs.Count() != 1 {
|
||||
log.Fatalf("Unexpected number of relocs in %s\n", ldr.SymName(ts))
|
||||
}
|
||||
sb.ResetRelocs()
|
||||
|
||||
}
|
||||
}
|
||||
return ts, firstUse
|
||||
}
|
||||
|
||||
func gentext(ctxt *ld.Link, ldr *loader.Loader) {
|
||||
if ctxt.DynlinkingGo() {
|
||||
genaddmoduledata(ctxt, ldr)
|
||||
}
|
||||
|
||||
if ctxt.LinkMode == ld.LinkInternal {
|
||||
genplt(ctxt, ldr)
|
||||
genstubs(ctxt, ldr)
|
||||
}
|
||||
}
|
||||
|
||||
@ -863,6 +954,13 @@ func gentramp(ctxt *ld.Link, ldr *loader.Loader, tramp *loader.SymbolBuilder, ta
|
||||
o1 = uint32(0x3c000000) | 12<<21 // lis r12,targetaddr hi
|
||||
o2 = uint32(0x38000000) | 12<<21 | 12<<16 // addi r12,r12,targetaddr lo
|
||||
|
||||
// ELFv2 save/restore functions use R0/R12 in special ways, therefore trampolines
|
||||
// as generated here will not always work correctly.
|
||||
if strings.HasPrefix(ldr.SymName(target), "runtime.elf_") {
|
||||
log.Fatalf("Internal linker does not support trampolines to ELFv2 ABI"+
|
||||
" register save/restore function %s", ldr.SymName(target))
|
||||
}
|
||||
|
||||
t := ldr.SymValue(target)
|
||||
if t == 0 || r2Valid(ctxt) || ctxt.IsExternal() {
|
||||
// Target address is unknown, generate relocations
|
||||
|
||||
@ -1051,3 +1051,206 @@ TEXT runtime·panicSliceConvert<ABIInternal>(SB),NOSPLIT,$0-16
|
||||
MOVD R5, R3
|
||||
MOVD R6, R4
|
||||
JMP runtime·goPanicSliceConvert<ABIInternal>(SB)
|
||||
|
||||
// These functions are used when internal linking cgo with external
|
||||
// objects compiled with the -Os on gcc. They reduce prologue/epilogue
|
||||
// size by deferring preservation of callee-save registers to a shared
|
||||
// function. These are defined in PPC64 ELFv2 2.3.3 (but also present
|
||||
// in ELFv1)
|
||||
//
|
||||
// These appear unused, but the linker will redirect calls to functions
|
||||
// like _savegpr0_14 or _restgpr1_14 to runtime.elf_savegpr0 or
|
||||
// runtime.elf_restgpr1 with an appropriate offset based on the number
|
||||
// register operations required when linking external objects which
|
||||
// make these calls. For GPR/FPR saves, the minimum register value is
|
||||
// 14, for VR it is 20.
|
||||
//
|
||||
// These are only used when linking such cgo code internally. Note, R12
|
||||
// and R0 may be used in different ways than regular ELF compliant
|
||||
// functions.
|
||||
TEXT runtime·elf_savegpr0(SB),NOSPLIT|NOFRAME,$0
|
||||
// R0 holds the LR of the caller's caller, R1 holds save location
|
||||
MOVD R14, -144(R1)
|
||||
MOVD R15, -136(R1)
|
||||
MOVD R16, -128(R1)
|
||||
MOVD R17, -120(R1)
|
||||
MOVD R18, -112(R1)
|
||||
MOVD R19, -104(R1)
|
||||
MOVD R20, -96(R1)
|
||||
MOVD R21, -88(R1)
|
||||
MOVD R22, -80(R1)
|
||||
MOVD R23, -72(R1)
|
||||
MOVD R24, -64(R1)
|
||||
MOVD R25, -56(R1)
|
||||
MOVD R26, -48(R1)
|
||||
MOVD R27, -40(R1)
|
||||
MOVD R28, -32(R1)
|
||||
MOVD R29, -24(R1)
|
||||
MOVD g, -16(R1)
|
||||
MOVD R31, -8(R1)
|
||||
MOVD R0, 16(R1)
|
||||
RET
|
||||
TEXT runtime·elf_restgpr0(SB),NOSPLIT|NOFRAME,$0
|
||||
// R1 holds save location. This returns to the LR saved on stack (bypassing the caller)
|
||||
MOVD -144(R1), R14
|
||||
MOVD -136(R1), R15
|
||||
MOVD -128(R1), R16
|
||||
MOVD -120(R1), R17
|
||||
MOVD -112(R1), R18
|
||||
MOVD -104(R1), R19
|
||||
MOVD -96(R1), R20
|
||||
MOVD -88(R1), R21
|
||||
MOVD -80(R1), R22
|
||||
MOVD -72(R1), R23
|
||||
MOVD -64(R1), R24
|
||||
MOVD -56(R1), R25
|
||||
MOVD -48(R1), R26
|
||||
MOVD -40(R1), R27
|
||||
MOVD -32(R1), R28
|
||||
MOVD -24(R1), R29
|
||||
MOVD -16(R1), g
|
||||
MOVD -8(R1), R31
|
||||
MOVD 16(R1), R0 // Load and return to saved LR
|
||||
MOVD R0, LR
|
||||
RET
|
||||
TEXT runtime·elf_savegpr1(SB),NOSPLIT|NOFRAME,$0
|
||||
// R12 holds the save location
|
||||
MOVD R14, -144(R12)
|
||||
MOVD R15, -136(R12)
|
||||
MOVD R16, -128(R12)
|
||||
MOVD R17, -120(R12)
|
||||
MOVD R18, -112(R12)
|
||||
MOVD R19, -104(R12)
|
||||
MOVD R20, -96(R12)
|
||||
MOVD R21, -88(R12)
|
||||
MOVD R22, -80(R12)
|
||||
MOVD R23, -72(R12)
|
||||
MOVD R24, -64(R12)
|
||||
MOVD R25, -56(R12)
|
||||
MOVD R26, -48(R12)
|
||||
MOVD R27, -40(R12)
|
||||
MOVD R28, -32(R12)
|
||||
MOVD R29, -24(R12)
|
||||
MOVD g, -16(R12)
|
||||
MOVD R31, -8(R12)
|
||||
RET
|
||||
TEXT runtime·elf_restgpr1(SB),NOSPLIT|NOFRAME,$0
|
||||
// R12 holds the save location
|
||||
MOVD -144(R12), R14
|
||||
MOVD -136(R12), R15
|
||||
MOVD -128(R12), R16
|
||||
MOVD -120(R12), R17
|
||||
MOVD -112(R12), R18
|
||||
MOVD -104(R12), R19
|
||||
MOVD -96(R12), R20
|
||||
MOVD -88(R12), R21
|
||||
MOVD -80(R12), R22
|
||||
MOVD -72(R12), R23
|
||||
MOVD -64(R12), R24
|
||||
MOVD -56(R12), R25
|
||||
MOVD -48(R12), R26
|
||||
MOVD -40(R12), R27
|
||||
MOVD -32(R12), R28
|
||||
MOVD -24(R12), R29
|
||||
MOVD -16(R12), g
|
||||
MOVD -8(R12), R31
|
||||
RET
|
||||
TEXT runtime·elf_savefpr(SB),NOSPLIT|NOFRAME,$0
|
||||
// R0 holds the LR of the caller's caller, R1 holds save location
|
||||
FMOVD F14, -144(R1)
|
||||
FMOVD F15, -136(R1)
|
||||
FMOVD F16, -128(R1)
|
||||
FMOVD F17, -120(R1)
|
||||
FMOVD F18, -112(R1)
|
||||
FMOVD F19, -104(R1)
|
||||
FMOVD F20, -96(R1)
|
||||
FMOVD F21, -88(R1)
|
||||
FMOVD F22, -80(R1)
|
||||
FMOVD F23, -72(R1)
|
||||
FMOVD F24, -64(R1)
|
||||
FMOVD F25, -56(R1)
|
||||
FMOVD F26, -48(R1)
|
||||
FMOVD F27, -40(R1)
|
||||
FMOVD F28, -32(R1)
|
||||
FMOVD F29, -24(R1)
|
||||
FMOVD F30, -16(R1)
|
||||
FMOVD F31, -8(R1)
|
||||
MOVD R0, 16(R1)
|
||||
RET
|
||||
TEXT runtime·elf_restfpr(SB),NOSPLIT|NOFRAME,$0
|
||||
// R1 holds save location. This returns to the LR saved on stack (bypassing the caller)
|
||||
FMOVD -144(R1), F14
|
||||
FMOVD -136(R1), F15
|
||||
FMOVD -128(R1), F16
|
||||
FMOVD -120(R1), F17
|
||||
FMOVD -112(R1), F18
|
||||
FMOVD -104(R1), F19
|
||||
FMOVD -96(R1), F20
|
||||
FMOVD -88(R1), F21
|
||||
FMOVD -80(R1), F22
|
||||
FMOVD -72(R1), F23
|
||||
FMOVD -64(R1), F24
|
||||
FMOVD -56(R1), F25
|
||||
FMOVD -48(R1), F26
|
||||
FMOVD -40(R1), F27
|
||||
FMOVD -32(R1), F28
|
||||
FMOVD -24(R1), F29
|
||||
FMOVD -16(R1), F30
|
||||
FMOVD -8(R1), F31
|
||||
MOVD 16(R1), R0 // Load and return to saved LR
|
||||
MOVD R0, LR
|
||||
RET
|
||||
TEXT runtime·elf_savevr(SB),NOSPLIT|NOFRAME,$0
|
||||
// R0 holds the save location, R12 is clobbered
|
||||
MOVD $-192, R12
|
||||
STVX V20, (R0+R12)
|
||||
MOVD $-176, R12
|
||||
STVX V21, (R0+R12)
|
||||
MOVD $-160, R12
|
||||
STVX V22, (R0+R12)
|
||||
MOVD $-144, R12
|
||||
STVX V23, (R0+R12)
|
||||
MOVD $-128, R12
|
||||
STVX V24, (R0+R12)
|
||||
MOVD $-112, R12
|
||||
STVX V25, (R0+R12)
|
||||
MOVD $-96, R12
|
||||
STVX V26, (R0+R12)
|
||||
MOVD $-80, R12
|
||||
STVX V27, (R0+R12)
|
||||
MOVD $-64, R12
|
||||
STVX V28, (R0+R12)
|
||||
MOVD $-48, R12
|
||||
STVX V29, (R0+R12)
|
||||
MOVD $-32, R12
|
||||
STVX V30, (R0+R12)
|
||||
MOVD $-16, R12
|
||||
STVX V31, (R0+R12)
|
||||
RET
|
||||
TEXT runtime·elf_restvr(SB),NOSPLIT|NOFRAME,$0
|
||||
// R0 holds the save location, R12 is clobbered
|
||||
MOVD $-192, R12
|
||||
LVX (R0+R12), V20
|
||||
MOVD $-176, R12
|
||||
LVX (R0+R12), V21
|
||||
MOVD $-160, R12
|
||||
LVX (R0+R12), V22
|
||||
MOVD $-144, R12
|
||||
LVX (R0+R12), V23
|
||||
MOVD $-128, R12
|
||||
LVX (R0+R12), V24
|
||||
MOVD $-112, R12
|
||||
LVX (R0+R12), V25
|
||||
MOVD $-96, R12
|
||||
LVX (R0+R12), V26
|
||||
MOVD $-80, R12
|
||||
LVX (R0+R12), V27
|
||||
MOVD $-64, R12
|
||||
LVX (R0+R12), V28
|
||||
MOVD $-48, R12
|
||||
LVX (R0+R12), V29
|
||||
MOVD $-32, R12
|
||||
LVX (R0+R12), V30
|
||||
MOVD $-16, R12
|
||||
LVX (R0+R12), V31
|
||||
RET
|
||||
|
||||
Loading…
Reference in New Issue
Block a user