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| author | Al Viro <viro@ZenIV.linux.org.uk> | 2012-08-19 14:41:00 +1200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-08-19 08:41:19 -0700 |
| commit | 28d353d9891c28496e366bebe4e65233f59ad1f6 (patch) | |
| tree | 814900bf40b5e24c4b50396c4df22058fc951c60 /arch/alpha | |
| parent | be53db6e4edd9dc013b21a929ad2b142dea8b9c0 (diff) | |
| download | linux-stable-28d353d9891c28496e366bebe4e65233f59ad1f6.tar.gz linux-stable-28d353d9891c28496e366bebe4e65233f59ad1f6.tar.bz2 linux-stable-28d353d9891c28496e366bebe4e65233f59ad1f6.zip | |
alpha: take kernel_execve() out of entry.S
Signed-off-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Michael Cree <mcree@orcon.net.nz>
Acked-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/alpha')
| -rw-r--r-- | arch/alpha/kernel/alpha_ksyms.c | 1 | ||||
| -rw-r--r-- | arch/alpha/kernel/entry.S | 52 | ||||
| -rw-r--r-- | arch/alpha/kernel/process.c | 19 |
3 files changed, 19 insertions, 53 deletions
diff --git a/arch/alpha/kernel/alpha_ksyms.c b/arch/alpha/kernel/alpha_ksyms.c index a354277bbaa7..15fa821d09cd 100644 --- a/arch/alpha/kernel/alpha_ksyms.c +++ b/arch/alpha/kernel/alpha_ksyms.c @@ -52,7 +52,6 @@ EXPORT_SYMBOL(alpha_write_fp_reg_s); /* entry.S */ EXPORT_SYMBOL(kernel_thread); -EXPORT_SYMBOL(kernel_execve); /* Networking helper routines. */ EXPORT_SYMBOL(csum_tcpudp_magic); diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S index 22b0c4d414a7..ec0da0567ab5 100644 --- a/arch/alpha/kernel/entry.S +++ b/arch/alpha/kernel/entry.S @@ -663,58 +663,6 @@ kernel_thread: br ret_to_kernel .end kernel_thread -/* - * kernel_execve(path, argv, envp) - */ - .align 4 - .globl kernel_execve - .ent kernel_execve -kernel_execve: - /* We can be called from a module. */ - ldgp $gp, 0($27) - lda $sp, -(32+SIZEOF_PT_REGS+8)($sp) - .frame $sp, 32+SIZEOF_PT_REGS+8, $26, 0 - stq $26, 0($sp) - stq $16, 8($sp) - stq $17, 16($sp) - stq $18, 24($sp) - .prologue 1 - - lda $16, 32($sp) - lda $17, 0 - lda $18, SIZEOF_PT_REGS - bsr $26, memset !samegp - - /* Avoid the HAE being gratuitously wrong, which would cause us - to do the whole turn off interrupts thing and restore it. */ - ldq $2, alpha_mv+HAE_CACHE - stq $2, 152+32($sp) - - ldq $16, 8($sp) - ldq $17, 16($sp) - ldq $18, 24($sp) - lda $19, 32($sp) - bsr $26, do_execve !samegp - - ldq $26, 0($sp) - bne $0, 1f /* error! */ - - /* Move the temporary pt_regs struct from its current location - to the top of the kernel stack frame. See copy_thread for - details for a normal process. */ - lda $16, 0x4000 - SIZEOF_PT_REGS($8) - lda $17, 32($sp) - lda $18, SIZEOF_PT_REGS - bsr $26, memmove !samegp - - /* Take that over as our new stack frame and visit userland! */ - lda $sp, 0x4000 - SIZEOF_PT_REGS($8) - br $31, ret_from_sys_call - -1: lda $sp, 32+SIZEOF_PT_REGS+8($sp) - ret -.end kernel_execve - /* * Special system calls. Most of these are special in that they either diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c index 153d3fce3e8e..d6fde98b74b3 100644 --- a/arch/alpha/kernel/process.c +++ b/arch/alpha/kernel/process.c @@ -455,3 +455,22 @@ get_wchan(struct task_struct *p) } return pc; } + +int kernel_execve(const char *path, const char *const argv[], const char *const envp[]) +{ + /* Avoid the HAE being gratuitously wrong, which would cause us + to do the whole turn off interrupts thing and restore it. */ + struct pt_regs regs = {.hae = alpha_mv.hae_cache}; + int err = do_execve(path, argv, envp, ®s); + if (!err) { + struct pt_regs *p = current_pt_regs(); + /* copy regs to normal position and off to userland we go... */ + *p = regs; + __asm__ __volatile__ ( + "mov %0, $sp;" + "br $31, ret_from_sys_call" + : : "r"(p)); + } + return err; +} +EXPORT_SYMBOL(kernel_execve); |