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cmd/internal/obj: add prologue_end DWARF stmt for ppc64

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This patch adds a prologue_end statement to the DWARF information for
the ppc64 arch.

Prologue end is used by the Delve debugger in order to determine where
to set a breakpoint to avoid the stacksplit prologue.

Updates #36612

Change-Id: Ifb16c1476fe716a0bf493c5486d1d88ebe8d0253
GitHub-Last-Rev: 77a217206d
GitHub-Pull-Request: golang/go#42261
Reviewed-on: https://go-review.googlesource.com/c/go/+/266019
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Alessandro Arzilli <alessandro.arzilli@gmail.com>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
This commit is contained in:
Derek Parker 2020-10-28 20:54:27 +00:00 committed by Dmitri Shuralyov
parent fd841f6536
commit 63fd764502
1 changed files with 7 additions and 1 deletions
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8
src/cmd/internal/obj/ppc64/obj9.go
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@ -32,6 +32,7 @@ package ppc64
import (
"cmd/internal/obj"
"cmd/internal/objabi"
"cmd/internal/src"
"cmd/internal/sys"
)
@ -672,6 +673,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
// save the link register and update the stack, since that code is
// called directly from C/C++ and can't clobber REGTMP (R31).
if autosize != 0 && c.cursym.Name != "runtime.racecallbackthunk" {
var prologueEnd *obj.Prog
// Save the link register and update the SP. MOVDU is used unless
// the frame size is too large. The link register must be saved
// even for non-empty leaf functions so that traceback works.
@ -685,6 +687,8 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
q.To.Type = obj.TYPE_REG
q.To.Reg = REGTMP
prologueEnd = q
q = obj.Appendp(q, c.newprog)
q.As = AMOVDU
q.Pos = p.Pos
@ -720,6 +724,8 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
q.To.Offset = int64(-autosize)
q.To.Reg = REGSP
prologueEnd = q
q = obj.Appendp(q, c.newprog)
q.As = AADD
q.Pos = p.Pos
@ -730,8 +736,8 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
q.Spadj = +autosize
q = c.ctxt.EndUnsafePoint(q, c.newprog, -1)
}
prologueEnd.Pos = prologueEnd.Pos.WithXlogue(src.PosPrologueEnd)
} else if c.cursym.Func().Text.Mark&LEAF == 0 {
// A very few functions that do not return to their caller
// (e.g. gogo) are not identified as leaves but still have