Merge tag 'linux-kselftest-nolibc-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull nolibc updates from Shuah Khan:
 "Nolibc:
   - improved portability by removing build errors with -ENOSYS
   - added syscall6() on MIPS to support pselect6() and mmap()
   - added setvbuf(), rmdir(), pipe(), pipe2()
   - add support for ppc/ppc64
   - environ is no longer optional
   - fixed frame pointer issues at -O0
   - dropped sys_stat() in favor of sys_statx()
   - centralized _start_c() to remove lots of asm code
   - switched size_t to __SIZE_TYPE__

  Selftests:
   - improved status reporting (success/warning/failure counts, path to
     log file)
   - various code cleanups (indent, unused variables, ...)
   - more consistent test numbering
   - enabled compiler warnings
   - dropped unreliable chmod_net test
   - improved reliability (create /dev/zero & /tmp, rely less on /proc)
   - new tests (brk/sbrk/mmap/munmap)
   - improved compatibility with musl
   - new run-nolibc-test target to build and run natively
   - new run-libc-test target to build and run against native libc
   - made the cmdline parser more reliable against boolean arguments
   - dropped dependency on memfd for vfprintf() test
   - nolibc-test is no longer stripped
   - added support for extending ARCH via XARCH

  Other:
   - add Thomas as co-maintainer"

* tag 'linux-kselftest-nolibc-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (103 commits)
  tools/nolibc: avoid undesired casts in the __sysret() macro
  tools/nolibc: keep brk(), sbrk(), mmap() away from __sysret()
  tools/nolibc: silence ppc64 compile warnings
  selftests/nolibc: libc-test: use HOSTCC instead of CC
  tools/nolibc: stackprotector.h: make __stack_chk_init static
  selftests/nolibc: allow report with existing test log
  selftests/nolibc: add test support for ppc64
  selftests/nolibc: add test support for ppc64le
  selftests/nolibc: add test support for ppc
  selftests/nolibc: add XARCH and ARCH mapping support
  tools/nolibc: add support for powerpc64
  tools/nolibc: add support for powerpc
  MAINTAINERS: nolibc: add myself as co-maintainer
  selftests/nolibc: enable compiler warnings
  selftests/nolibc: don't strip nolibc-test
  selftests/nolibc: prevent out of bounds access in expect_vfprintf
  selftests/nolibc: use correct return type for read() and write()
  selftests/nolibc: avoid sign-compare warnings
  selftests/nolibc: avoid unused parameter warnings
  selftests/nolibc: make functions static if possible
  ...

1 files changed, 20 insertions, 66 deletions

diff --git a/tools/include/nolibc/arch-i386.h b/tools/include/nolibc/arch-i386.h
index 3d672d925e9e..64415b9fac77 100644
--- a/tools/include/nolibc/arch-i386.h
+++ b/tools/include/nolibc/arch-i386.h
@@ -8,32 +8,7 @@
 #define _NOLIBC_ARCH_I386_H
 
 #include "compiler.h"
-
-/* The struct returned by the stat() syscall, 32-bit only, the syscall returns
- * exactly 56 bytes (stops before the unused array).
- */
-struct sys_stat_struct {
-	unsigned long  st_dev;
-	unsigned long  st_ino;
-	unsigned short st_mode;
-	unsigned short st_nlink;
-	unsigned short st_uid;
-	unsigned short st_gid;
-
-	unsigned long  st_rdev;
-	unsigned long  st_size;
-	unsigned long  st_blksize;
-	unsigned long  st_blocks;
-
-	unsigned long  st_atime;
-	unsigned long  st_atime_nsec;
-	unsigned long  st_mtime;
-	unsigned long  st_mtime_nsec;
-
-	unsigned long  st_ctime;
-	unsigned long  st_ctime_nsec;
-	unsigned long  __unused[2];
-};
+#include "crt.h"
 
 /* Syscalls for i386 :
  *   - mostly similar to x86_64
@@ -57,8 +32,8 @@ struct sys_stat_struct {
 ({                                                                            \
 	long _ret;                                                            \
 	register long _num __asm__ ("eax") = (num);                           \
-	                                                                      \
-	__asm__  volatile (                                                   \
+									      \
+	__asm__ volatile (                                                    \
 		"int $0x80\n"                                                 \
 		: "=a" (_ret)                                                 \
 		: "0"(_num)                                                   \
@@ -72,8 +47,8 @@ struct sys_stat_struct {
 	long _ret;                                                            \
 	register long _num __asm__ ("eax") = (num);                           \
 	register long _arg1 __asm__ ("ebx") = (long)(arg1);                   \
-	                                                                      \
-	__asm__  volatile (                                                   \
+									      \
+	__asm__ volatile (                                                    \
 		"int $0x80\n"                                                 \
 		: "=a" (_ret)                                                 \
 		: "r"(_arg1),                                                 \
@@ -89,8 +64,8 @@ struct sys_stat_struct {
 	register long _num __asm__ ("eax") = (num);                           \
 	register long _arg1 __asm__ ("ebx") = (long)(arg1);                   \
 	register long _arg2 __asm__ ("ecx") = (long)(arg2);                   \
-	                                                                      \
-	__asm__  volatile (                                                   \
+									      \
+	__asm__ volatile (                                                    \
 		"int $0x80\n"                                                 \
 		: "=a" (_ret)                                                 \
 		: "r"(_arg1), "r"(_arg2),                                     \
@@ -107,8 +82,8 @@ struct sys_stat_struct {
 	register long _arg1 __asm__ ("ebx") = (long)(arg1);                   \
 	register long _arg2 __asm__ ("ecx") = (long)(arg2);                   \
 	register long _arg3 __asm__ ("edx") = (long)(arg3);                   \
-	                                                                      \
-	__asm__  volatile (                                                   \
+									      \
+	__asm__ volatile (                                                    \
 		"int $0x80\n"                                                 \
 		: "=a" (_ret)                                                 \
 		: "r"(_arg1), "r"(_arg2), "r"(_arg3),                         \
@@ -126,8 +101,8 @@ struct sys_stat_struct {
 	register long _arg2 __asm__ ("ecx") = (long)(arg2);                   \
 	register long _arg3 __asm__ ("edx") = (long)(arg3);                   \
 	register long _arg4 __asm__ ("esi") = (long)(arg4);                   \
-	                                                                      \
-	__asm__  volatile (                                                   \
+									      \
+	__asm__ volatile (                                                    \
 		"int $0x80\n"                                                 \
 		: "=a" (_ret)                                                 \
 		: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4),             \
@@ -146,8 +121,8 @@ struct sys_stat_struct {
 	register long _arg3 __asm__ ("edx") = (long)(arg3);                   \
 	register long _arg4 __asm__ ("esi") = (long)(arg4);                   \
 	register long _arg5 __asm__ ("edi") = (long)(arg5);                   \
-	                                                                      \
-	__asm__  volatile (                                                   \
+									      \
+	__asm__ volatile (                                                    \
 		"int $0x80\n"                                                 \
 		: "=a" (_ret)                                                 \
 		: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
@@ -180,9 +155,6 @@ struct sys_stat_struct {
 	_eax;							\
 })
 
-char **environ __attribute__((weak));
-const unsigned long *_auxv __attribute__((weak));
-
 /* startup code */
 /*
  * i386 System V ABI mandates:
@@ -190,33 +162,15 @@ const unsigned long *_auxv __attribute__((weak));
  * 2) The deepest stack frame should be set to zero
  *
  */
-void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_stack_protector _start(void)
+void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_stack_protector _start(void)
 {
 	__asm__ volatile (
-#ifdef _NOLIBC_STACKPROTECTOR
-		"call __stack_chk_init\n"   /* initialize stack protector                    */
-#endif
-		"pop %eax\n"                /* argc   (first arg, %eax)                      */
-		"mov %esp, %ebx\n"          /* argv[] (second arg, %ebx)                     */
-		"lea 4(%ebx,%eax,4),%ecx\n" /* then a NULL then envp (third arg, %ecx)       */
-		"mov %ecx, environ\n"       /* save environ                                  */
-		"xor %ebp, %ebp\n"          /* zero the stack frame                          */
-		"mov %ecx, %edx\n"          /* search for auxv (follows NULL after last env) */
-		"0:\n"
-		"add $4, %edx\n"            /* search for auxv using edx, it follows the     */
-		"cmp -4(%edx), %ebp\n"      /* ... NULL after last env (ebp is zero here)    */
-		"jnz 0b\n"
-		"mov %edx, _auxv\n"         /* save it into _auxv                            */
-		"and $-16, %esp\n"          /* x86 ABI : esp must be 16-byte aligned before  */
-		"sub $4, %esp\n"            /* the call instruction (args are aligned)       */
-		"push %ecx\n"               /* push all registers on the stack so that we    */
-		"push %ebx\n"               /* support both regparm and plain stack modes    */
-		"push %eax\n"
-		"call main\n"               /* main() returns the status code in %eax        */
-		"mov %eax, %ebx\n"          /* retrieve exit code (32-bit int)               */
-		"movl $1, %eax\n"           /* NR_exit == 1                                  */
-		"int $0x80\n"               /* exit now                                      */
-		"hlt\n"                     /* ensure it does not                            */
+		"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        */
+		"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                           */
 	);
 	__builtin_unreachable();
 }