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s390: convert to generic kernel_execve()

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same situation as with alpha and arm - only massage needed

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-09-06 17:08:47 -04:00
parent f9a7e025df
commit f322220d61
3 changed files with 13 additions and 49 deletions
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1
arch/s390/include/asm/unistd.h
View File

@ -416,6 +416,7 @@
# define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
# endif
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_KERNEL_EXECVE
/*
* "Conditional" syscalls

30
arch/s390/kernel/entry.S
View File

@ -355,30 +355,13 @@ ENTRY(kernel_thread_starter)
# kernel_execve function needs to deal with pt_regs that is not
# at the usual place
#
ENTRY(kernel_execve)
stm %r12,%r15,48(%r15)
lr %r14,%r15
l %r13,__LC_SVC_NEW_PSW+4
ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
st %r14,__SF_BACKCHAIN(%r15)
la %r12,STACK_FRAME_OVERHEAD(%r15)
xc 0(__PT_SIZE,%r12),0(%r12)
l %r1,BASED(.Ldo_execve)
lr %r5,%r12
basr %r14,%r1 # call do_execve
ltr %r2,%r2
je 0f
ahi %r15,(STACK_FRAME_OVERHEAD + __PT_SIZE)
lm %r12,%r15,48(%r15)
br %r14
# execve succeeded.
0: ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
l %r15,__LC_KERNEL_STACK # load ksp
ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
la %r11,STACK_FRAME_OVERHEAD(%r15)
mvc 0(__PT_SIZE,%r11),0(%r12) # copy pt_regs
l %r12,__LC_THREAD_INFO
ENTRY(ret_from_kernel_execve)
ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
lr %r15,%r2
lr %r11,%r2
ahi %r15,-STACK_FRAME_OVERHEAD
xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
l %r12,__LC_THREAD_INFO
ssm __LC_SVC_NEW_PSW # reenable interrupts
j sysc_return
@ -941,7 +924,6 @@ cleanup_idle_wait:
.Ldo_signal: .long do_signal
.Ldo_notify_resume: .long do_notify_resume
.Ldo_per_trap: .long do_per_trap
.Ldo_execve: .long do_execve
.Ljump_table: .long pgm_check_table
.Lschedule: .long schedule
#ifdef CONFIG_PREEMPT

31
arch/s390/kernel/entry64.S
View File

@ -369,32 +369,13 @@ ENTRY(kernel_thread_starter)
la %r2,0
br %r11 # do_exit
#
# kernel_execve function needs to deal with pt_regs that is not
# at the usual place
#
ENTRY(kernel_execve)
stmg %r12,%r15,96(%r15)
lgr %r14,%r15
aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
stg %r14,__SF_BACKCHAIN(%r15)
la %r12,STACK_FRAME_OVERHEAD(%r15)
xc 0(__PT_SIZE,%r12),0(%r12)
lgr %r5,%r12
brasl %r14,do_execve
ltgfr %r2,%r2
je 0f
aghi %r15,(STACK_FRAME_OVERHEAD + __PT_SIZE)
lmg %r12,%r15,96(%r15)
br %r14
# execve succeeded.
0: ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
lg %r15,__LC_KERNEL_STACK # load ksp
aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
la %r11,STACK_FRAME_OVERHEAD(%r15)
mvc 0(__PT_SIZE,%r11),0(%r12) # copy pt_regs
lg %r12,__LC_THREAD_INFO
ENTRY(ret_from_kernel_execve)
ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
lgr %r15,%r2
lgr %r11,%r2
aghi %r15,-STACK_FRAME_OVERHEAD
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
lg %r12,__LC_THREAD_INFO
ssm __LC_SVC_NEW_PSW # reenable interrupts
j sysc_return