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[S390] compat ptrace cleanup

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This removes redundant arch code for generic ptrace requests
already handled by ptrace_request and compat_ptrace_request.
It simplifies things to just have the standard entry points,
and use the generic compat_sys_ptrace.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Roland McGrath 2008-05-07 09:22:57 +02:00 committed by Martin Schwidefsky
parent c6ca1850e7
commit b499d76bfd
3 changed files with 9 additions and 95 deletions
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2
arch/s390/kernel/compat_wrapper.S
View file

@ -121,7 +121,7 @@ sys32_ptrace_wrapper:
lgfr %r3,%r3 # long
llgtr %r4,%r4 # long
llgfr %r5,%r5 # long
jg sys_ptrace # branch to system call
jg compat_sys_ptrace # branch to system call
.globl sys32_alarm_wrapper
sys32_alarm_wrapper:

100
arch/s390/kernel/ptrace.c
View file

@ -292,8 +292,7 @@ poke_user(struct task_struct *child, addr_t addr, addr_t data)
return 0;
}
static int
do_ptrace_normal(struct task_struct *child, long request, long addr, long data)
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
ptrace_area parea;
int copied, ret;
@ -529,35 +528,19 @@ poke_user_emu31(struct task_struct *child, addr_t addr, addr_t data)
return 0;
}
static int
do_ptrace_emu31(struct task_struct *child, long request, long addr, long data)
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
compat_ulong_t caddr, compat_ulong_t cdata)
{
unsigned int tmp; /* 4 bytes !! */
unsigned long addr = caddr;
unsigned long data = cdata;
ptrace_area_emu31 parea;
int copied, ret;
switch (request) {
case PTRACE_PEEKTEXT:
case PTRACE_PEEKDATA:
/* read word at location addr. */
copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
if (copied != sizeof(tmp))
return -EIO;
return put_user(tmp, (unsigned int __force __user *) data);
case PTRACE_PEEKUSR:
/* read the word at location addr in the USER area. */
return peek_user_emu31(child, addr, data);
case PTRACE_POKETEXT:
case PTRACE_POKEDATA:
/* write the word at location addr. */
tmp = data;
copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 1);
if (copied != sizeof(tmp))
return -EIO;
return 0;
case PTRACE_POKEUSR:
/* write the word at location addr in the USER area */
return poke_user_emu31(child, addr, data);
@ -587,82 +570,11 @@ do_ptrace_emu31(struct task_struct *child, long request, long addr, long data)
copied += sizeof(unsigned int);
}
return 0;
case PTRACE_GETEVENTMSG:
return put_user((__u32) child->ptrace_message,
(unsigned int __force __user *) data);
case PTRACE_GETSIGINFO:
if (child->last_siginfo == NULL)
return -EINVAL;
return copy_siginfo_to_user32((compat_siginfo_t
__force __user *) data,
child->last_siginfo);
case PTRACE_SETSIGINFO:
if (child->last_siginfo == NULL)
return -EINVAL;
return copy_siginfo_from_user32(child->last_siginfo,
(compat_siginfo_t
__force __user *) data);
}
return ptrace_request(child, request, addr, data);
return compat_ptrace_request(child, request, addr, data);
}
#endif
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
switch (request) {
case PTRACE_SYSCALL:
/* continue and stop at next (return from) syscall */
case PTRACE_CONT:
/* restart after signal. */
if (!valid_signal(data))
return -EIO;
if (request == PTRACE_SYSCALL)
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
else
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
/* make sure the single step bit is not set. */
user_disable_single_step(child);
wake_up_process(child);
return 0;
case PTRACE_KILL:
/*
* make the child exit. Best I can do is send it a sigkill.
* perhaps it should be put in the status that it wants to
* exit.
*/
if (child->exit_state == EXIT_ZOMBIE) /* already dead */
return 0;
child->exit_code = SIGKILL;
/* make sure the single step bit is not set. */
user_disable_single_step(child);
wake_up_process(child);
return 0;
case PTRACE_SINGLESTEP:
/* set the trap flag. */
if (!valid_signal(data))
return -EIO;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
user_enable_single_step(child);
/* give it a chance to run. */
wake_up_process(child);
return 0;
/* Do requests that differ for 31/64 bit */
default:
#ifdef CONFIG_COMPAT
if (test_thread_flag(TIF_31BIT))
return do_ptrace_emu31(child, request, addr, data);
#endif
return do_ptrace_normal(child, request, addr, data);
}
/* Not reached. */
return -EIO;
}
asmlinkage void
syscall_trace(struct pt_regs *regs, int entryexit)
{

2
include/asm-s390/ptrace.h
View file

@ -471,6 +471,8 @@ struct task_struct;
extern void user_enable_single_step(struct task_struct *);
extern void user_disable_single_step(struct task_struct *);
#define __ARCH_WANT_COMPAT_SYS_PTRACE
#define user_mode(regs) (((regs)->psw.mask & PSW_MASK_PSTATE) != 0)
#define instruction_pointer(regs) ((regs)->psw.addr & PSW_ADDR_INSN)
#define regs_return_value(regs)((regs)->gprs[2])