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runtime: fix windows/arm64 callbackasm1 for frame pointer hack

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Fixes the previously failing TestStdcallAndCDeclCallbacks
for the 9+ argument case.

The last time this code passed, the invisible frame pointer
below SP was apparently not enabled on windows/arm64.

Change-Id: Ifc3064e894b2f39d6410f3be51c17309ebab08a4
Reviewed-on: https://go-review.googlesource.com/c/go/+/312042
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Russ Cox 2021-04-20 14:05:49 -04:00
parent 16330817aa
commit a25d1d45d9
1 changed files with 14 additions and 9 deletions
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23
src/runtime/sys_windows_arm64.s
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@ -309,14 +309,19 @@ TEXT runtime·callbackasm1<ABIInternal>(SB),NOSPLIT,$208-0
// Save callback register arguments R0-R7.
// We do this at the top of the frame so they're contiguous with stack arguments.
MOVD R0, arg0-(8*8)(SP)
MOVD R1, arg1-(7*8)(SP)
MOVD R2, arg2-(6*8)(SP)
MOVD R3, arg3-(5*8)(SP)
MOVD R4, arg4-(4*8)(SP)
MOVD R5, arg5-(3*8)(SP)
MOVD R6, arg6-(2*8)(SP)
MOVD R7, arg7-(1*8)(SP)
// The 7*8 setting up R14 looks like a bug but is not: the eighth word
// is the space the assembler reserved for our caller's frame pointer,
// but we are not called from Go so that space is ours to use,
// and we must to be contiguous with the stack arguments.
MOVD $arg0-(7*8)(SP), R14
MOVD R0, (0*8)(R14)
MOVD R1, (1*8)(R14)
MOVD R2, (2*8)(R14)
MOVD R3, (3*8)(R14)
MOVD R4, (4*8)(R14)
MOVD R5, (5*8)(R14)
MOVD R6, (6*8)(R14)
MOVD R7, (7*8)(R14)
// Push C callee-save registers R19-R28.
// LR, FP already saved.
@ -325,7 +330,7 @@ TEXT runtime·callbackasm1<ABIInternal>(SB),NOSPLIT,$208-0
// Create a struct callbackArgs on our stack.
MOVD $cbargs-(18*8+callbackArgs__size)(SP), R13
MOVD R12, callbackArgs_index(R13) // callback index
MOVD $arg0-(8*8)(SP), R0
MOVD R14, R0
MOVD R0, callbackArgs_args(R13) // address of args vector
MOVD $0, R0
MOVD R0, callbackArgs_result(R13) // result