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[POWERPC] Add compat handler for PTRACE_GETSIGINFO

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Current versions of gdb require a working implementation of
PTRACE_GETSIGINFO for proper watchpoint support.  Since struct siginfo
contains pointers it must be converted when passed to a 32-bit debugger.

Signed-off-by: Andreas Schwab <schwab@suse.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Andreas Schwab 2008-04-20 02:25:13 +10:00 committed by Paul Mackerras
parent 585468e5d5
commit e4cc58944c
2 changed files with 29 additions and 0 deletions
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2
arch/powerpc/kernel/ppc32.h
View File

@ -135,4 +135,6 @@ struct ucontext32 {
struct mcontext32 uc_mcontext;
};
extern int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s);
#endif /* _PPC64_PPC32_H */

27
arch/powerpc/kernel/ptrace32.c
View File

@ -29,12 +29,15 @@
#include <linux/security.h>
#include <linux/signal.h>
#include <linux/compat.h>
#include <linux/elf.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include "ppc32.h"
/*
* does not yet catch signals sent when the child dies.
* in exit.c or in signal.c.
@ -64,6 +67,27 @@ static long compat_ptrace_old(struct task_struct *child, long request,
return -EPERM;
}
static int compat_ptrace_getsiginfo(struct task_struct *child, compat_siginfo_t __user *data)
{
siginfo_t lastinfo;
int error = -ESRCH;
read_lock(&tasklist_lock);
if (likely(child->sighand != NULL)) {
error = -EINVAL;
spin_lock_irq(&child->sighand->siglock);
if (likely(child->last_siginfo != NULL)) {
lastinfo = *child->last_siginfo;
error = 0;
}
spin_unlock_irq(&child->sighand->siglock);
}
read_unlock(&tasklist_lock);
if (!error)
return copy_siginfo_to_user32(data, &lastinfo);
return error;
}
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
compat_ulong_t caddr, compat_ulong_t cdata)
{
@ -282,6 +306,9 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
0, PT_REGS_COUNT * sizeof(compat_long_t),
compat_ptr(data));
case PTRACE_GETSIGINFO:
return compat_ptrace_getsiginfo(child, compat_ptr(data));
case PTRACE_GETFPREGS:
case PTRACE_SETFPREGS:
case PTRACE_GETVRREGS: