mirror of https://github.com/golang/go.git
runtime/cgo: preserve VRs across crosscall_ppc64 on linux
Rework this function to closely match the PPC64 crosscall2, but written in gnu asm. Likewise, fix this to store TOC in the new frame, not the caller's, as is required by the ELF ABIs. Change-Id: I8902c74f2607e3436260882a7bea52e72a67b8f9 Reviewed-on: https://go-review.googlesource.com/c/go/+/486335 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Run-TryBot: Paul Murphy <murp@ibm.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com> Reviewed-by: Carlos Amedee <carlos@golang.org> Auto-Submit: Carlos Amedee <carlos@golang.org>
This commit is contained in:
Paul E. Murphy
Gopher Robot
parent
1e51b1fac3
commit
5c51e9f45b
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@ -6,6 +6,37 @@
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.file "gcc_linux_ppc64x.S"
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// Define a frame which has no argument space, but is compatible with
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// a call into a Go ABI. We allocate 32B to match FIXED_FRAME with
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// similar semantics, except we store the backchain pointer, not the
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// LR at offset 0. R2 is stored in the Go TOC save slot (offset 24).
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.set GPR_OFFSET, 32
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.set FPR_OFFSET, GPR_OFFSET + 18*8
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.set VR_OFFSET, FPR_OFFSET + 18*8
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.set FRAME_SIZE, VR_OFFSET + 12*16
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.macro FOR_EACH_GPR opcode r=14
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.ifge 31 - \r
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\opcode \r, GPR_OFFSET + 8*(\r-14)(1)
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FOR_EACH_GPR \opcode "(\r+1)"
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.endif
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.endm
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.macro FOR_EACH_FPR opcode fr=14
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.ifge 31 - \fr
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\opcode \fr, FPR_OFFSET + 8*(\fr-14)(1)
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FOR_EACH_FPR \opcode "(\fr+1)"
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.endif
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.endm
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.macro FOR_EACH_VR opcode vr=20
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.ifge 31 - \vr
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li 0, VR_OFFSET + 16*(\vr-20)
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\opcode \vr, 1, 0
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FOR_EACH_VR \opcode "(\vr+1)"
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.endif
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.endm
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/*
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* void crosscall_ppc64(void (*fn)(void), void *g)
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*
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@ -18,13 +49,17 @@ crosscall_ppc64:
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// Start with standard C stack frame layout and linkage
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mflr %r0
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std %r0, 16(%r1) // Save LR in caller's frame
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std %r2, 24(%r1) // Save TOC in caller's frame
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bl saveregs
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stdu %r1, -296(%r1)
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mfcr %r0
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std %r0, 8(%r1) // Save CR in caller's frame
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stdu %r1, -FRAME_SIZE(%r1)
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std %r2, 24(%r1)
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FOR_EACH_GPR std
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FOR_EACH_FPR stfd
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FOR_EACH_VR stvx
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// Set up Go ABI constant registers
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bl _cgo_reginit
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nop
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li %r0, 0
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// Restore g pointer (r30 in Go ABI, which may have been clobbered by C)
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mr %r30, %r4
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@ -34,97 +69,18 @@ crosscall_ppc64:
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mtctr %r3
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bctrl
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addi %r1, %r1, 296
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bl restoreregs
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FOR_EACH_GPR ld
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FOR_EACH_FPR lfd
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FOR_EACH_VR lvx
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ld %r2, 24(%r1)
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addi %r1, %r1, FRAME_SIZE
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ld %r0, 16(%r1)
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mtlr %r0
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ld %r0, 8(%r1)
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mtcr %r0
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blr
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saveregs:
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// Save callee-save registers
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// O=-288; for R in %r{14..31}; do echo "\tstd\t$R, $O(%r1)"; ((O+=8)); done; for F in f{14..31}; do echo "\tstfd\t$F, $O(%r1)"; ((O+=8)); done
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std %r14, -288(%r1)
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std %r15, -280(%r1)
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std %r16, -272(%r1)
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std %r17, -264(%r1)
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std %r18, -256(%r1)
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std %r19, -248(%r1)
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std %r20, -240(%r1)
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std %r21, -232(%r1)
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std %r22, -224(%r1)
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std %r23, -216(%r1)
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std %r24, -208(%r1)
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std %r25, -200(%r1)
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std %r26, -192(%r1)
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std %r27, -184(%r1)
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std %r28, -176(%r1)
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std %r29, -168(%r1)
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std %r30, -160(%r1)
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std %r31, -152(%r1)
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stfd %f14, -144(%r1)
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stfd %f15, -136(%r1)
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stfd %f16, -128(%r1)
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stfd %f17, -120(%r1)
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stfd %f18, -112(%r1)
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stfd %f19, -104(%r1)
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stfd %f20, -96(%r1)
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stfd %f21, -88(%r1)
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stfd %f22, -80(%r1)
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stfd %f23, -72(%r1)
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stfd %f24, -64(%r1)
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stfd %f25, -56(%r1)
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stfd %f26, -48(%r1)
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stfd %f27, -40(%r1)
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stfd %f28, -32(%r1)
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stfd %f29, -24(%r1)
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stfd %f30, -16(%r1)
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stfd %f31, -8(%r1)
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blr
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restoreregs:
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// O=-288; for R in %r{14..31}; do echo "\tld\t$R, $O(%r1)"; ((O+=8)); done; for F in %f{14..31}; do echo "\tlfd\t$F, $O(%r1)"; ((O+=8)); done
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ld %r14, -288(%r1)
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ld %r15, -280(%r1)
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ld %r16, -272(%r1)
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ld %r17, -264(%r1)
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ld %r18, -256(%r1)
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ld %r19, -248(%r1)
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ld %r20, -240(%r1)
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ld %r21, -232(%r1)
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ld %r22, -224(%r1)
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ld %r23, -216(%r1)
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ld %r24, -208(%r1)
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ld %r25, -200(%r1)
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ld %r26, -192(%r1)
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ld %r27, -184(%r1)
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ld %r28, -176(%r1)
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ld %r29, -168(%r1)
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ld %r30, -160(%r1)
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ld %r31, -152(%r1)
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lfd %f14, -144(%r1)
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lfd %f15, -136(%r1)
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lfd %f16, -128(%r1)
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lfd %f17, -120(%r1)
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lfd %f18, -112(%r1)
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lfd %f19, -104(%r1)
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lfd %f20, -96(%r1)
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lfd %f21, -88(%r1)
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lfd %f22, -80(%r1)
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lfd %f23, -72(%r1)
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lfd %f24, -64(%r1)
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lfd %f25, -56(%r1)
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lfd %f26, -48(%r1)
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lfd %f27, -40(%r1)
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lfd %f28, -32(%r1)
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lfd %f29, -24(%r1)
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lfd %f30, -16(%r1)
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lfd %f31, -8(%r1)
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blr
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#ifdef __ELF__
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.section .note.GNU-stack,"",%progbits
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#endif
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