mirror of https://github.com/golang/go.git
runtime/cgo: preserve nonvolatile VRs when crosscalling into Go on PPC64
ELFv1 and ELFv2 declare V20-V31 as nonvolatile (callee save) registers. Go does not. Preserve them before calling into Go. Change-Id: If60a6d8f71b51b1136a86eab2b90d964900becd7 Reviewed-on: https://go-review.googlesource.com/c/go/+/480657 Auto-Submit: Carlos Amedee <carlos@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Run-TryBot: Paul Murphy <murp@ibm.com> Reviewed-by: Carlos Amedee <carlos@golang.org> Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com> TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Paul E. Murphy
Gopher Robot
parent
c6116bea03
commit
1e51b1fac3
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@ -6,6 +6,7 @@
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#include "textflag.h"
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#include "asm_ppc64x.h"
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#include "abi_ppc64x.h"
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#ifdef GO_PPC64X_HAS_FUNCDESC
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// crosscall2 is marked with go:cgo_export_static. On AIX, this creates and exports
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@ -33,20 +34,14 @@ TEXT ·set_crosscall2(SB),NOSPLIT,$0-0
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// The value of R2 is saved on the new stack frame, and not
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// the caller's frame due to issue #43228.
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TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
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// Start with standard C stack frame layout and linkage
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MOVD LR, R0
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MOVD R0, 16(R1) // Save LR in caller's frame
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MOVW CR, R0 // Save CR in caller's frame
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MOVW R0, 8(R1)
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BL saveregs2<>(SB)
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MOVDU R1, (-288-3*8-FIXED_FRAME)(R1)
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// Save the caller's R2
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// Start with standard C stack frame layout and linkage, allocate
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// 32 bytes of argument space, save callee-save regs, and set R0 to $0.
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STACK_AND_SAVE_HOST_TO_GO_ABI(32)
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// The above will not preserve R2 (TOC). Save it in case Go is
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// compiled without a TOC pointer (e.g -buildmode=default).
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MOVD R2, 24(R1)
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// Initialize Go ABI environment
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BL runtime·reginit(SB)
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// Load the current g.
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BL runtime·load_g(SB)
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#ifdef GO_PPC64X_HAS_FUNCDESC
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@ -64,96 +59,7 @@ nil_fn:
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MOVD R6, FIXED_FRAME+16(R1) // ctxt uintptr
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BL runtime·cgocallback(SB)
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// Restore the caller's R2
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// Restore the old frame, and R2.
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MOVD 24(R1), R2
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ADD $(288+3*8+FIXED_FRAME), R1
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BL restoreregs2<>(SB)
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MOVW 8(R1), R0
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MOVFL R0, $0xff
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MOVD 16(R1), R0
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MOVD R0, LR
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RET
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TEXT saveregs2<>(SB),NOSPLIT|NOFRAME,$0
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// O=-288; for R in R{14..31}; do echo "\tMOVD\t$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
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MOVD R14, -288(R1)
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MOVD R15, -280(R1)
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MOVD R16, -272(R1)
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MOVD R17, -264(R1)
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MOVD R18, -256(R1)
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MOVD R19, -248(R1)
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MOVD R20, -240(R1)
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MOVD R21, -232(R1)
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MOVD R22, -224(R1)
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MOVD R23, -216(R1)
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MOVD R24, -208(R1)
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MOVD R25, -200(R1)
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MOVD R26, -192(R1)
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MOVD R27, -184(R1)
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MOVD R28, -176(R1)
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MOVD R29, -168(R1)
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MOVD g, -160(R1)
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MOVD R31, -152(R1)
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FMOVD F14, -144(R1)
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FMOVD F15, -136(R1)
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FMOVD F16, -128(R1)
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FMOVD F17, -120(R1)
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FMOVD F18, -112(R1)
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FMOVD F19, -104(R1)
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FMOVD F20, -96(R1)
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FMOVD F21, -88(R1)
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FMOVD F22, -80(R1)
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FMOVD F23, -72(R1)
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FMOVD F24, -64(R1)
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FMOVD F25, -56(R1)
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FMOVD F26, -48(R1)
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FMOVD F27, -40(R1)
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FMOVD F28, -32(R1)
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FMOVD F29, -24(R1)
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FMOVD F30, -16(R1)
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FMOVD F31, -8(R1)
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RET
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TEXT restoreregs2<>(SB),NOSPLIT|NOFRAME,$0
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// O=-288; for R in R{14..31}; do echo "\tMOVD\t$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
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MOVD -288(R1), R14
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MOVD -280(R1), R15
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MOVD -272(R1), R16
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MOVD -264(R1), R17
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MOVD -256(R1), R18
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MOVD -248(R1), R19
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MOVD -240(R1), R20
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MOVD -232(R1), R21
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MOVD -224(R1), R22
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MOVD -216(R1), R23
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MOVD -208(R1), R24
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MOVD -200(R1), R25
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MOVD -192(R1), R26
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MOVD -184(R1), R27
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MOVD -176(R1), R28
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MOVD -168(R1), R29
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MOVD -160(R1), g
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MOVD -152(R1), R31
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FMOVD -144(R1), F14
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FMOVD -136(R1), F15
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FMOVD -128(R1), F16
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FMOVD -120(R1), F17
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FMOVD -112(R1), F18
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FMOVD -104(R1), F19
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FMOVD -96(R1), F20
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FMOVD -88(R1), F21
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FMOVD -80(R1), F22
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FMOVD -72(R1), F23
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FMOVD -64(R1), F24
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FMOVD -56(R1), F25
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FMOVD -48(R1), F26
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FMOVD -40(R1), F27
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FMOVD -32(R1), F28
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FMOVD -24(R1), F29
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FMOVD -16(R1), F30
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FMOVD -8(R1), F31
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UNSTACK_AND_RESTORE_GO_TO_HOST_ABI(32)
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RET
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