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s390: switch to saner kernel_execve() semantics

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Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-10-11 15:30:14 -04:00
parent ddffeb8c4d
commit 30dcb0996e
4 changed files with 16 additions and 54 deletions
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1
arch/s390/Kconfig
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@ -136,6 +136,7 @@ config S390
select KTIME_SCALAR if 32BIT
select HAVE_ARCH_SECCOMP_FILTER
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA

1
arch/s390/include/asm/unistd.h
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@ -54,7 +54,6 @@
# define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
# endif
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_KERNEL_EXECVE
/*
* "Conditional" syscalls

38
arch/s390/kernel/entry.S
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@ -330,40 +330,18 @@ ENTRY(ret_from_fork)
la %r11,STACK_FRAME_OVERHEAD(%r15)
l %r12,__LC_THREAD_INFO
l %r13,__LC_SVC_NEW_PSW+4
l %r1,BASED(.Lschedule_tail)
basr %r14,%r1 # call schedule_tail
TRACE_IRQS_ON
ssm __LC_SVC_NEW_PSW # reenable interrupts
tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
je 1f
l %r1,BASED(.Lschedule_tail)
basr %r14,%r1 # call schedule_tail
TRACE_IRQS_ON
ssm __LC_SVC_NEW_PSW # reenable interrupts
j sysc_tracenogo
1: # it's a kernel thread
st %r15,__PT_R15(%r11) # store stack pointer for new kthread
l %r1,BASED(.Lschedule_tail)
basr %r14,%r1 # call schedule_tail
TRACE_IRQS_ON
ssm __LC_SVC_NEW_PSW # reenable interrupts
lm %r9,%r11,__PT_R9(%r11) # load gprs
jne sysc_tracenogo
# it's a kernel thread
lm %r9,%r10,__PT_R9(%r11) # load gprs
ENTRY(kernel_thread_starter)
la %r2,0(%r10)
basr %r14,%r9
la %r2,0
br %r11 # do_exit
#
# kernel_execve function needs to deal with pt_regs that is not
# at the usual place
#
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
j sysc_tracenogo
/*
* Program check handler routine

30
arch/s390/kernel/entry64.S
View File

@ -352,33 +352,17 @@ sysc_tracenogo:
ENTRY(ret_from_fork)
la %r11,STACK_FRAME_OVERHEAD(%r15)
lg %r12,__LC_THREAD_INFO
brasl %r14,schedule_tail
TRACE_IRQS_ON
ssm __LC_SVC_NEW_PSW # reenable interrupts
tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
je 1f
brasl %r14,schedule_tail
TRACE_IRQS_ON
ssm __LC_SVC_NEW_PSW # reenable interrupts
j sysc_tracenogo
1: # it's a kernel thread
stg %r15,__PT_R15(%r11) # store stack pointer for new kthread
brasl %r14,schedule_tail
TRACE_IRQS_ON
ssm __LC_SVC_NEW_PSW # reenable interrupts
lmg %r9,%r11,__PT_R9(%r11) # load gprs
jne sysc_tracenogo
# it's a kernel thread
lmg %r9,%r10,__PT_R9(%r11) # load gprs
ENTRY(kernel_thread_starter)
la %r2,0(%r10)
basr %r14,%r9
la %r2,0
br %r11 # do_exit
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
j sysc_tracenogo
/*
* Program check handler routine