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reflect: fix memmove for big endian cases with new ABI

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Some memmoves in reflect/value.go for copying arguments
related to the new ABI were using the address of the target
or source instead of using IntArgRegAddr or FloatArgRegAddr
to adjust the address for big endian.

This was found when testing patches for ppc64 and fixes the
failures that were found.

Change-Id: I119aa090a2a8eb859020ff1a1736107a6d0b76f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/343869
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
This commit is contained in:
Lynn Boger 2021-08-20 07:01:50 -05:00
parent 4fbb5c8666
commit f1d8ea1da3
1 changed files with 8 additions and 8 deletions
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16
src/reflect/value.go
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@ -508,7 +508,7 @@ func (v Value) call(op string, in []Value) []Value {
// Copy values to "integer registers." // Copy values to "integer registers."
if v.flag&flagIndir != 0 { if v.flag&flagIndir != 0 {
offset := add(v.ptr, st.offset, "precomputed value offset") offset := add(v.ptr, st.offset, "precomputed value offset")
memmove(unsafe.Pointer(&regArgs.Ints[st.ireg]), offset, st.size) memmove(regArgs.IntRegArgAddr(st.ireg, st.size), offset, st.size)
} else { } else {
if st.kind == abiStepPointer { if st.kind == abiStepPointer {
// Duplicate this pointer in the pointer area of the // Duplicate this pointer in the pointer area of the
@ -524,7 +524,7 @@ func (v Value) call(op string, in []Value) []Value {
panic("attempted to copy pointer to FP register") panic("attempted to copy pointer to FP register")
} }
offset := add(v.ptr, st.offset, "precomputed value offset") offset := add(v.ptr, st.offset, "precomputed value offset")
memmove(unsafe.Pointer(&regArgs.Floats[st.freg]), offset, st.size) memmove(regArgs.FloatRegArgAddr(st.freg, st.size), offset, st.size)
default: default:
panic("unknown ABI part kind") panic("unknown ABI part kind")
} }
@ -610,13 +610,13 @@ func (v Value) call(op string, in []Value) []Value {
switch st.kind { switch st.kind {
case abiStepIntReg: case abiStepIntReg:
offset := add(s, st.offset, "precomputed value offset") offset := add(s, st.offset, "precomputed value offset")
memmove(offset, unsafe.Pointer(&regArgs.Ints[st.ireg]), st.size) memmove(offset, regArgs.IntRegArgAddr(st.ireg, st.size), st.size)
case abiStepPointer: case abiStepPointer:
s := add(s, st.offset, "precomputed value offset") s := add(s, st.offset, "precomputed value offset")
*((*unsafe.Pointer)(s)) = regArgs.Ptrs[st.ireg] *((*unsafe.Pointer)(s)) = regArgs.Ptrs[st.ireg]
case abiStepFloatReg: case abiStepFloatReg:
offset := add(s, st.offset, "precomputed value offset") offset := add(s, st.offset, "precomputed value offset")
memmove(offset, unsafe.Pointer(&regArgs.Floats[st.freg]), st.size) memmove(offset, regArgs.FloatRegArgAddr(st.freg, st.size), st.size)
case abiStepStack: case abiStepStack:
panic("register-based return value has stack component") panic("register-based return value has stack component")
default: default:
@ -698,13 +698,13 @@ func callReflect(ctxt *makeFuncImpl, frame unsafe.Pointer, retValid *bool, regs
switch st.kind { switch st.kind {
case abiStepIntReg: case abiStepIntReg:
offset := add(v.ptr, st.offset, "precomputed value offset") offset := add(v.ptr, st.offset, "precomputed value offset")
memmove(offset, unsafe.Pointer(&regs.Ints[st.ireg]), st.size) memmove(offset, regs.IntRegArgAddr(st.ireg, st.size), st.size)
case abiStepPointer: case abiStepPointer:
s := add(v.ptr, st.offset, "precomputed value offset") s := add(v.ptr, st.offset, "precomputed value offset")
*((*unsafe.Pointer)(s)) = regs.Ptrs[st.ireg] *((*unsafe.Pointer)(s)) = regs.Ptrs[st.ireg]
case abiStepFloatReg: case abiStepFloatReg:
offset := add(v.ptr, st.offset, "precomputed value offset") offset := add(v.ptr, st.offset, "precomputed value offset")
memmove(offset, unsafe.Pointer(&regs.Floats[st.freg]), st.size) memmove(offset, regs.FloatRegArgAddr(st.freg, st.size), st.size)
case abiStepStack: case abiStepStack:
panic("register-based return value has stack component") panic("register-based return value has stack component")
default: default:
@ -784,7 +784,7 @@ func callReflect(ctxt *makeFuncImpl, frame unsafe.Pointer, retValid *bool, regs
// Copy values to "integer registers." // Copy values to "integer registers."
if v.flag&flagIndir != 0 { if v.flag&flagIndir != 0 {
offset := add(v.ptr, st.offset, "precomputed value offset") offset := add(v.ptr, st.offset, "precomputed value offset")
memmove(unsafe.Pointer(&regs.Ints[st.ireg]), offset, st.size) memmove(regs.IntRegArgAddr(st.ireg, st.size), offset, st.size)
} else { } else {
// Only populate the Ints space on the return path. // Only populate the Ints space on the return path.
// This is safe because out is kept alive until the // This is safe because out is kept alive until the
@ -799,7 +799,7 @@ func callReflect(ctxt *makeFuncImpl, frame unsafe.Pointer, retValid *bool, regs
panic("attempted to copy pointer to FP register") panic("attempted to copy pointer to FP register")
} }
offset := add(v.ptr, st.offset, "precomputed value offset") offset := add(v.ptr, st.offset, "precomputed value offset")
memmove(unsafe.Pointer(&regs.Floats[st.freg]), offset, st.size) memmove(regs.FloatRegArgAddr(st.freg, st.size), offset, st.size)
default: default:
panic("unknown ABI part kind") panic("unknown ABI part kind")
} }