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Subject[-mm patch] AVR32: Implement kernel_execve
Move execve() into arch/avr32/kernel/sys_avr32.c, rename it to
kernel_execve() and return the syscall return value directly without
setting errno.

This also gets rid of the __KERNEL_SYSCALLS__ stuff from unistd.h
and expands #ifdef __KERNEL__ to cover everything in unistd.h except
the __NR_foo definitions.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

---
arch/avr32/kernel/sys_avr32.c | 14 +++++++
include/asm-avr32/unistd.h | 80 +-----------------------------------------
2 files changed, 17 insertions(+), 77 deletions(-)
Index: linux-2.6.18-rc5-mm1/arch/avr32/kernel/sys_avr32.c
===================================================================
--- linux-2.6.18-rc5-mm1.orig/arch/avr32/kernel/sys_avr32.c 2006-09-04 11:34:13.000000000 +0200
+++ linux-2.6.18-rc5-mm1/arch/avr32/kernel/sys_avr32.c 2006-09-04 12:57:34.000000000 +0200
@@ -49,3 +49,17 @@ asmlinkage long sys_mmap2(unsigned long
fput(file);
return error;
}
+
+int kernel_execve(const char *file, char **argv, char **envp)
+{
+ register long scno asm("r8") = __NR_execve;
+ register long sc1 asm("r12") = (long)file;
+ register long sc2 asm("r11") = (long)argv;
+ register long sc3 asm("r10") = (long)envp;
+
+ asm volatile("scall"
+ : "=r"(sc1)
+ : "r"(scno), "0"(sc1), "r"(sc2), "r"(sc3)
+ : "cc", "memory");
+ return sc1;
+}
Index: linux-2.6.18-rc5-mm1/include/asm-avr32/unistd.h
===================================================================
--- linux-2.6.18-rc5-mm1.orig/include/asm-avr32/unistd.h 2006-09-04 11:21:48.000000000 +0200
+++ linux-2.6.18-rc5-mm1/include/asm-avr32/unistd.h 2006-09-04 11:39:26.000000000 +0200
@@ -281,30 +281,10 @@
#define __NR_tee 263
#define __NR_vmsplice 264

+#ifdef __KERNEL__
#define NR_syscalls 265


-/*
- * AVR32 calling convention for system calls:
- * - System call number in r8
- * - Parameters in r12 and downwards to r9 as well as r6 and r5.
- * - Return value in r12
- */
-
-/*
- * user-visible error numbers are in the range -1 - -124: see
- * <asm-generic/errno.h>
- */
-
-#define __syscall_return(type, res) do { \
- if ((unsigned long)(res) >= (unsigned long)(-125)) { \
- errno = -(res); \
- res = -1; \
- } \
- return (type) (res); \
- } while (0)
-
-#ifdef __KERNEL__
#define __ARCH_WANT_IPC_PARSE_VERSION
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYS_ALARM
@@ -319,62 +299,6 @@
#define __ARCH_WANT_SYS_GETPGRP
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
-#endif
-
-#if defined(__KERNEL_SYSCALLS__) || defined(__CHECKER__)
-
-#include <linux/types.h>
-#include <linux/linkage.h>
-#include <asm/signal.h>
-
-struct pt_regs;
-
-/*
- * we need this inline - forking from kernel space will result
- * in NO COPY ON WRITE (!!!), until an execve is executed. This
- * is no problem, but for the stack. This is handled by not letting
- * main() use the stack at all after fork(). Thus, no function
- * calls - which means inline code for fork too, as otherwise we
- * would use the stack upon exit from 'fork()'.
- *
- * Actually only pause and fork are needed inline, so that there
- * won't be any messing with the stack from main(), but we define
- * some others too.
- */
-static inline int execve(const char *file, char **argv, char **envp)
-{
- register long scno asm("r8") = __NR_execve;
- register long sc1 asm("r12") = (long)file;
- register long sc2 asm("r11") = (long)argv;
- register long sc3 asm("r10") = (long)envp;
- int res;
-
- asm volatile("scall"
- : "=r"(sc1)
- : "r"(scno), "0"(sc1), "r"(sc2), "r"(sc3)
- : "lr", "memory");
- res = sc1;
- __syscall_return(int, res);
-}
-
-asmlinkage long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize);
-asmlinkage int sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
- struct pt_regs *regs);
-asmlinkage int sys_rt_sigreturn(struct pt_regs *regs);
-asmlinkage int sys_pipe(unsigned long __user *filedes);
-asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
- unsigned long prot, unsigned long flags,
- unsigned long fd, off_t offset);
-asmlinkage int sys_cacheflush(int operation, void __user *addr, size_t len);
-asmlinkage int sys_fork(struct pt_regs *regs);
-asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
- unsigned long parent_tidptr,
- unsigned long child_tidptr, struct pt_regs *regs);
-asmlinkage int sys_vfork(struct pt_regs *regs);
-asmlinkage int sys_execve(char __user *ufilename, char __user *__user *uargv,
- char __user *__user *uenvp, struct pt_regs *regs);
-
-#endif

/*
* "Conditional" syscalls
@@ -384,4 +308,6 @@ asmlinkage int sys_execve(char __user *u
*/
#define cond_syscall(x) asm(".weak\t" #x "\n\t.set\t" #x ",sys_ni_syscall");

+#endif /* __KERNEL__ */
+
#endif /* __ASM_AVR32_UNISTD_H */
--
VGER BF report: U 0.500178
-
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