summaryrefslogtreecommitdiff
path: root/arch/s390/kernel
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/compat_linux.c26
-rw-r--r--arch/s390/kernel/compat_linux.h2
-rw-r--r--arch/s390/kernel/compat_wrapper.S2
-rw-r--r--arch/s390/kernel/entry.S51
-rw-r--r--arch/s390/kernel/entry.h3
-rw-r--r--arch/s390/kernel/entry64.S50
-rw-r--r--arch/s390/kernel/process.c107
7 files changed, 75 insertions, 166 deletions
diff --git a/arch/s390/kernel/compat_linux.c b/arch/s390/kernel/compat_linux.c
index 189963c90c6e..65cca95843e1 100644
--- a/arch/s390/kernel/compat_linux.c
+++ b/arch/s390/kernel/compat_linux.c
@@ -432,32 +432,6 @@ sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
return ret;
}
-/*
- * sys32_execve() executes a new program after the asm stub has set
- * things up for us. This should basically do what I want it to.
- */
-asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
- compat_uptr_t __user *envp)
-{
- struct pt_regs *regs = task_pt_regs(current);
- char *filename;
- long rc;
-
- filename = getname(name);
- rc = PTR_ERR(filename);
- if (IS_ERR(filename))
- return rc;
- rc = compat_do_execve(filename, argv, envp, regs);
- if (rc)
- goto out;
- current->thread.fp_regs.fpc=0;
- asm volatile("sfpc %0,0" : : "d" (0));
- rc = regs->gprs[2];
-out:
- putname(filename);
- return rc;
-}
-
asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
size_t count, u32 poshi, u32 poslo)
{
diff --git a/arch/s390/kernel/compat_linux.h b/arch/s390/kernel/compat_linux.h
index 90887bd98cf0..d4d0239970ac 100644
--- a/arch/s390/kernel/compat_linux.h
+++ b/arch/s390/kernel/compat_linux.h
@@ -125,8 +125,6 @@ long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
compat_sigset_t __user *oset, size_t sigsetsize);
long sys32_rt_sigpending(compat_sigset_t __user *set, size_t sigsetsize);
long sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo);
-long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
- compat_uptr_t __user *envp);
long sys32_init_module(void __user *umod, unsigned long len,
const char __user *uargs);
long sys32_delete_module(const char __user *name_user, unsigned int flags);
diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index 3afba804fe97..ad79b846535c 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/arch/s390/kernel/compat_wrapper.S
@@ -1576,7 +1576,7 @@ ENTRY(sys32_execve_wrapper)
llgtr %r2,%r2 # char *
llgtr %r3,%r3 # compat_uptr_t *
llgtr %r4,%r4 # compat_uptr_t *
- jg sys32_execve # branch to system call
+ jg compat_sys_execve # branch to system call
ENTRY(sys_fanotify_init_wrapper)
llgfr %r2,%r2 # unsigned int
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 870bad6d56fc..ef46f66bc0d6 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -331,45 +331,38 @@ ENTRY(ret_from_fork)
l %r12,__LC_THREAD_INFO
l %r13,__LC_SVC_NEW_PSW+4
tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
- jo 0f
- st %r15,__PT_R15(%r11) # store stack pointer for new kthread
-0: l %r1,BASED(.Lschedule_tail)
+ 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
+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(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
- l %r1,BASED(.Lexecve_tail)
- basr %r14,%r1 # call execve_tail
j sysc_return
/*
@@ -931,8 +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
-.Lexecve_tail: .long execve_tail
.Ljump_table: .long pgm_check_table
.Lschedule: .long schedule
#ifdef CONFIG_PREEMPT
diff --git a/arch/s390/kernel/entry.h b/arch/s390/kernel/entry.h
index a5f4dc42a5db..d0d3f69a7346 100644
--- a/arch/s390/kernel/entry.h
+++ b/arch/s390/kernel/entry.h
@@ -58,9 +58,6 @@ long sys_fork(void);
long sys_clone(unsigned long newsp, unsigned long clone_flags,
int __user *parent_tidptr, int __user *child_tidptr);
long sys_vfork(void);
-void execve_tail(void);
-long sys_execve(const char __user *name, const char __user *const __user *argv,
- const char __user *const __user *envp);
long sys_sigsuspend(int history0, int history1, old_sigset_t mask);
long sys_sigaction(int sig, const struct old_sigaction __user *act,
struct old_sigaction __user *oact);
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index 7549985402f7..f9761f806c9e 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -353,41 +353,31 @@ ENTRY(ret_from_fork)
la %r11,STACK_FRAME_OVERHEAD(%r15)
lg %r12,__LC_THREAD_INFO
tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
- jo 0f
- stg %r15,__PT_R15(%r11) # store stack pointer for new kthread
-0: brasl %r14,schedule_tail
+ je 1f
+ brasl %r14,schedule_tail
TRACE_IRQS_ON
ssm __LC_SVC_NEW_PSW # reenable interrupts
j sysc_tracenogo
-
-#
-# 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
+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
+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
- brasl %r14,execve_tail
j sysc_return
/*
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 5024be27df44..cd31ad457a9b 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -100,35 +100,6 @@ void cpu_idle(void)
extern void __kprobes kernel_thread_starter(void);
-asm(
- ".section .kprobes.text, \"ax\"\n"
- ".global kernel_thread_starter\n"
- "kernel_thread_starter:\n"
- " la 2,0(10)\n"
- " basr 14,9\n"
- " la 2,0\n"
- " br 11\n"
- ".previous\n");
-
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(&regs, 0, sizeof(regs));
- regs.psw.mask = psw_kernel_bits |
- PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
- regs.psw.addr = (unsigned long) kernel_thread_starter | PSW_ADDR_AMODE;
- regs.gprs[9] = (unsigned long) fn;
- regs.gprs[10] = (unsigned long) arg;
- regs.gprs[11] = (unsigned long) do_exit;
- regs.orig_gpr2 = -1;
-
- /* Ok, create the new process.. */
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED,
- 0, &regs, 0, NULL, NULL);
-}
-EXPORT_SYMBOL(kernel_thread);
-
/*
* Free current thread data structures etc..
*/
@@ -146,7 +117,7 @@ void release_thread(struct task_struct *dead_task)
}
int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
- unsigned long unused,
+ unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct thread_info *ti;
@@ -158,20 +129,44 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
frame = container_of(task_pt_regs(p), struct fake_frame, childregs);
p->thread.ksp = (unsigned long) frame;
- /* Store access registers to kernel stack of new process. */
- frame->childregs = *regs;
- frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */
- frame->childregs.gprs[15] = new_stackp;
- frame->sf.back_chain = 0;
+ /* Save access registers to new thread structure. */
+ save_access_regs(&p->thread.acrs[0]);
+ /* start new process with ar4 pointing to the correct address space */
+ p->thread.mm_segment = get_fs();
+ /* Don't copy debug registers */
+ memset(&p->thread.per_user, 0, sizeof(p->thread.per_user));
+ memset(&p->thread.per_event, 0, sizeof(p->thread.per_event));
+ clear_tsk_thread_flag(p, TIF_SINGLE_STEP);
+ clear_tsk_thread_flag(p, TIF_PER_TRAP);
+ /* Initialize per thread user and system timer values */
+ ti = task_thread_info(p);
+ ti->user_timer = 0;
+ ti->system_timer = 0;
+ frame->sf.back_chain = 0;
/* new return point is ret_from_fork */
frame->sf.gprs[8] = (unsigned long) ret_from_fork;
-
/* fake return stack for resume(), don't go back to schedule */
frame->sf.gprs[9] = (unsigned long) frame;
- /* Save access registers to new thread structure. */
- save_access_regs(&p->thread.acrs[0]);
+ /* Store access registers to kernel stack of new process. */
+ if (unlikely(!regs)) {
+ /* kernel thread */
+ memset(&frame->childregs, 0, sizeof(struct pt_regs));
+ frame->childregs.psw.mask = psw_kernel_bits | PSW_MASK_DAT |
+ PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
+ frame->childregs.psw.addr = PSW_ADDR_AMODE |
+ (unsigned long) kernel_thread_starter;
+ frame->childregs.gprs[9] = new_stackp; /* function */
+ frame->childregs.gprs[10] = arg;
+ frame->childregs.gprs[11] = (unsigned long) do_exit;
+ frame->childregs.orig_gpr2 = -1;
+
+ return 0;
+ }
+ frame->childregs = *regs;
+ frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */
+ frame->childregs.gprs[15] = new_stackp;
/* Don't copy runtime instrumentation info */
p->thread.ri_cb = NULL;
@@ -202,17 +197,6 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
}
}
#endif /* CONFIG_64BIT */
- /* start new process with ar4 pointing to the correct address space */
- p->thread.mm_segment = get_fs();
- /* Don't copy debug registers */
- memset(&p->thread.per_user, 0, sizeof(p->thread.per_user));
- memset(&p->thread.per_event, 0, sizeof(p->thread.per_event));
- clear_tsk_thread_flag(p, TIF_SINGLE_STEP);
- clear_tsk_thread_flag(p, TIF_PER_TRAP);
- /* Initialize per thread user and system timer values */
- ti = task_thread_info(p);
- ti->user_timer = 0;
- ti->system_timer = 0;
return 0;
}
@@ -258,31 +242,6 @@ asmlinkage void execve_tail(void)
}
/*
- * sys_execve() executes a new program.
- */
-SYSCALL_DEFINE3(execve, const char __user *, name,
- const char __user *const __user *, argv,
- const char __user *const __user *, envp)
-{
- struct pt_regs *regs = task_pt_regs(current);
- char *filename;
- long rc;
-
- filename = getname(name);
- rc = PTR_ERR(filename);
- if (IS_ERR(filename))
- return rc;
- rc = do_execve(filename, argv, envp, regs);
- if (rc)
- goto out;
- execve_tail();
- rc = regs->gprs[2];
-out:
- putname(filename);
- return rc;
-}
-
-/*
* fill in the FPU structure for a core dump.
*/
int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-12 10:04:56 +0000