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From: John David Anglin <danglin@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/release/2.33/master] hppa: Implement swapcontext in assembler (bug 28960) Date: Tue, 15 Mar 2022 23:18:24 +0000 (GMT) [thread overview] Message-ID: <20220315231824.209A53858D20@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=32f74d4f142edad319517798d74308305d82127e commit 32f74d4f142edad319517798d74308305d82127e Author: John David Anglin <danglin@gcc.gnu.org> Date: Tue Mar 15 23:12:37 2022 +0000 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. (cherry picked from commit 738ee53f0ce5e39b9b7a6777f5d3057afbaac498) Diff: --- sysdeps/unix/sysv/linux/hppa/swapcontext.S | 72 ++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/hppa/swapcontext.c | 83 ------------------------------ 2 files changed, 72 insertions(+), 83 deletions(-) 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)
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