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https://sourceware.org/git/?p=glibc.git;a=patch;h=738ee53f0ce5e39b9b7a6777f5d3057afbaac498
https://sourceware.org/git/?p=glibc.git;a=patch;h=d53b9cc391c72a1011ea8fe7a9f70dc5060a0db2
From 738ee53f0ce5e39b9b7a6777f5d3057afbaac498 Mon Sep 17 00:00:00 2001
From: John David Anglin <danglin@gcc.gnu.org>
Date: Tue, 15 Mar 2022 23:12:37 +0000
Subject: [PATCH] hppa: Implement swapcontext in assembler (bug 28960)
When swapcontext.c is compiled without -g, the following error occurs:
Error: CFI instruction used without previous .cfi_startproc
Fix by converting swapcontext routine to assembler.
---
sysdeps/unix/sysv/linux/hppa/swapcontext.S | 72 +++++++++++++++++++
sysdeps/unix/sysv/linux/hppa/swapcontext.c | 83 ----------------------
2 files changed, 72 insertions(+), 83 deletions(-)
create mode 100644 sysdeps/unix/sysv/linux/hppa/swapcontext.S
delete mode 100644 sysdeps/unix/sysv/linux/hppa/swapcontext.c
diff --git a/sysdeps/unix/sysv/linux/hppa/swapcontext.S b/sysdeps/unix/sysv/linux/hppa/swapcontext.S
new file mode 100644
index 0000000000..94b164dc63
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/hppa/swapcontext.S
@@ -0,0 +1,72 @@
+/* Swap to new context.
+ Copyright (C) 2008-2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include "ucontext_i.h"
+
+ .text
+ENTRY(__swapcontext)
+
+ /* Copy rp to ret0 (r28). */
+ copy %rp,%ret0
+
+ /* Create a frame. */
+ ldo 64(%sp),%sp
+ .cfi_def_cfa_offset -64
+
+ /* Save the current machine context to oucp. */
+ bl __getcontext,%rp
+
+ /* Copy oucp to register ret1 (r29). __getcontext saves and
+ restores it on a normal return. It is restored from oR29
+ on reactivation. */
+ copy %r26,%ret1
+
+ /* Pop frame. */
+ ldo -64(%sp),%sp
+ .cfi_def_cfa_offset 0
+
+ /* Load return pointer from oR28. */
+ ldw oR28(%ret1),%rp
+
+ /* Return if error. */
+ or,= %r0,%ret0,%r0
+ bv,n %r0(%rp)
+
+ /* Load sc_sar flag. */
+ ldb oSAR(%ret1),%r20
+
+ /* Return if oucp context has been reactivated. */
+ or,= %r0,%r20,%r0
+ bv,n %r0(%rp)
+
+ /* Mark sc_sar flag. */
+ ldi 1,%r20
+ stb %r20,oSAR(%ret1)
+
+ /* Activate the machine context in ucp. */
+ bl __setcontext,%rp
+ ldw oR25(%ret1),%r26
+
+ /* Load return pointer. */
+ ldw oR28(%ret1),%rp
+ bv,n %r0(%rp)
+
+PSEUDO_END(__swapcontext)
+
+weak_alias (__swapcontext, swapcontext)
diff --git a/sysdeps/unix/sysv/linux/hppa/swapcontext.c b/sysdeps/unix/sysv/linux/hppa/swapcontext.c
deleted file mode 100644
index 1664f68c7b..0000000000
--- a/sysdeps/unix/sysv/linux/hppa/swapcontext.c
+++ /dev/null
@@ -1,83 +0,0 @@
-/* Swap to new context.
- Copyright (C) 2008-2021 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Helge Deller <deller@gmx.de>, 2008.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library. If not, see
- <https://www.gnu.org/licenses/>. */
-
-#include <ucontext.h>
-#include "ucontext_i.h"
-
-extern int __getcontext (ucontext_t *ucp);
-extern int __setcontext (const ucontext_t *ucp);
-
-int
-__swapcontext (ucontext_t *oucp, const ucontext_t *ucp)
-{
- /* Save rp for debugger. */
- asm ("stw %rp,-20(%sp)");
- asm (".cfi_offset 2, -20");
-
- /* Copy rp to ret0 (r28). */
- asm ("copy %rp,%ret0");
-
- /* Create a frame. */
- asm ("ldo 64(%sp),%sp");
- asm (".cfi_def_cfa_offset -64");
-
- /* Save the current machine context to oucp. */
- asm ("bl __getcontext,%rp");
-
- /* Copy oucp to register ret1 (r29). __getcontext saves and restores it
- on a normal return. It is restored from oR29 on reactivation. */
- asm ("copy %r26,%ret1");
-
- /* Pop frame. */
- asm ("ldo -64(%sp),%sp");
- asm (".cfi_def_cfa_offset 0");
-
- /* Load return pointer from oR28. */
- asm ("ldw %0(%%ret1),%%rp" : : "i" (oR28));
-
- /* Return if error. */
- asm ("or,= %r0,%ret0,%r0");
- asm ("bv,n %r0(%rp)");
-
- /* Load sc_sar flag. */
- asm ("ldb %0(%%ret1),%%r20" : : "i" (oSAR));
-
- /* Return if oucp context has been reactivated. */
- asm ("or,= %r0,%r20,%r0");
- asm ("bv,n %r0(%rp)");
-
- /* Mark sc_sar flag. */
- asm ("1: ldi 1,%r20");
- asm ("stb %%r20,%0(%%ret1)" : : "i" (oSAR));
-
- /* Activate the machine context in ucp. */
- asm ("bl __setcontext,%rp");
- asm ("ldw %0(%%ret1),%%r26" : : "i" (oR25));
-
- /* Load return pointer. */
- asm ("ldw %0(%%ret1),%%rp" : : "i" (oR28));
-
- /* A successful call to setcontext does not return. */
- asm ("bv,n %r0(%rp)");
-
- /* Make gcc happy. */
- return 0;
-}
-
-weak_alias (__swapcontext, swapcontext)
--
2.27.0
From d53b9cc391c72a1011ea8fe7a9f70dc5060a0db2 Mon Sep 17 00:00:00 2001
From: John David Anglin <danglin@gcc.gnu.org>
Date: Tue, 15 Mar 2022 23:04:39 +0000
Subject: [PATCH] hppa: Use END instead of PSEUDO_END in swapcontext.S
(cherry picked from commit 7a5c440102d4ec7fafd9bbd98eca9bd90ecaaafd)
---
sysdeps/unix/sysv/linux/hppa/swapcontext.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sysdeps/unix/sysv/linux/hppa/swapcontext.S b/sysdeps/unix/sysv/linux/hppa/swapcontext.S
index 94b164dc63..fbc22586d1 100644
--- a/sysdeps/unix/sysv/linux/hppa/swapcontext.S
+++ b/sysdeps/unix/sysv/linux/hppa/swapcontext.S
@@ -67,6 +67,6 @@ ENTRY(__swapcontext)
ldw oR28(%ret1),%rp
bv,n %r0(%rp)
-PSEUDO_END(__swapcontext)
+END(__swapcontext)
weak_alias (__swapcontext, swapcontext)
--
2.27.0
|
