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cmd/internal/obj/loong64: save LR after decrementing SP

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Refer to CL 413428 and 412474, for loong64, like mips, s390x and riscv, there
is no single instruction that saves the LR and decrements the SP, so we also
need to insert an instruction to save the LR after decrementing the SP.

Fixes #56623.
Updates #53374.

Change-Id: I3de040792f0a041d3d2a98ea89c23a2dd2f4ad10
Reviewed-on: https://go-review.googlesource.com/c/go/+/416154
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Cherry Mui <cherryyz@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: xiaodong liu <teaofmoli@gmail.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
This commit is contained in:
Guoqi Chen 2022-07-05 19:41:27 +08:00 committed by Gopher Robot
parent 8c2900bb9f
commit 3ed8a1e629
1 changed files with 14 additions and 0 deletions
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14
src/cmd/internal/obj/loong64/obj.go
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@ -260,6 +260,20 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
q.Spadj = +autosize
q = c.ctxt.EndUnsafePoint(q, c.newprog, -1)
// On Linux, in a cgo binary we may get a SIGSETXID signal early on
// before the signal stack is set, as glibc doesn't allow us to block
// SIGSETXID. So a signal may land on the current stack and clobber
// the content below the SP. We store the LR again after the SP is
// decremented.
q = obj.Appendp(q, newprog)
q.As = mov
q.Pos = p.Pos
q.From.Type = obj.TYPE_REG
q.From.Reg = REGLINK
q.To.Type = obj.TYPE_MEM
q.To.Offset = 0
q.To.Reg = REGSP
}
if c.cursym.Func().Text.From.Sym.Wrapper() && c.cursym.Func().Text.Mark&LEAF == 0 {