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Urgent pull request for nolibc into v6.6

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This pull request contains the following fixes:
 
 o     tools/nolibc: i386: Fix a stack misalign bug on _start
 
 o     MAINTAINERS: nolibc: update tree location
 
 o     tools/nolibc: mark start_c as weak to avoid linker errors
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Merge tag 'urgent/nolibc.2023.10.16a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

Pull nolibc fixes from Paul McKenney:

 - tools/nolibc: i386: Fix a stack misalign bug on _start

 - MAINTAINERS: nolibc: update tree location

 - tools/nolibc: mark start_c as weak to avoid linker errors

* tag 'urgent/nolibc.2023.10.16a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
  tools/nolibc: mark start_c as weak
  MAINTAINERS: nolibc: update tree location
  tools/nolibc: i386: Fix a stack misalign bug on _start
This commit is contained in:
Linus Torvalds 2023-10-23 14:19:11 -10:00
commit 84186fcb83
3 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
MAINTAINERS
View File

@ -15131,7 +15131,7 @@ NOLIBC HEADER FILE
M: Willy Tarreau <w@1wt.eu>
M: Thomas Weißschuh <linux@weissschuh.net>
S: Maintained
T: git git://git.kernel.org/pub/scm/linux/kernel/git/wtarreau/nolibc.git
T: git git://git.kernel.org/pub/scm/linux/kernel/git/nolibc/linux-nolibc.git
F: tools/include/nolibc/
F: tools/testing/selftests/nolibc/

4
tools/include/nolibc/arch-i386.h
View File

@ -167,7 +167,9 @@ void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_
__asm__ volatile (
"xor %ebp, %ebp\n" /* zero the stack frame */
"mov %esp, %eax\n" /* save stack pointer to %eax, as arg1 of _start_c */
"and $-16, %esp\n" /* last pushed argument must be 16-byte aligned */
"add $12, %esp\n" /* avoid over-estimating after the 'and' & 'sub' below */
"and $-16, %esp\n" /* the %esp must be 16-byte aligned on 'call' */
"sub $12, %esp\n" /* sub 12 to keep it aligned after the push %eax */
"push %eax\n" /* push arg1 on stack to support plain stack modes too */
"call _start_c\n" /* transfer to c runtime */
"hlt\n" /* ensure it does not return */

1
tools/include/nolibc/crt.h
View File

@ -13,6 +13,7 @@ const unsigned long *_auxv __attribute__((weak));
static void __stack_chk_init(void);
static void exit(int);
__attribute__((weak))
void _start_c(long *sp)
{
long argc;