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Commit e4cc5894 authored by Andreas Schwab's avatar Andreas Schwab Committed by Paul Mackerras
Browse files

[POWERPC] Add compat handler for PTRACE_GETSIGINFO 



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: default avatarAndreas Schwab <schwab@suse.de>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 585468e5

arch/powerpc/kernel/ppc32.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */

arch/powerpc/kernel/ptrace32.c

+27 −0
Original line number Diff line number Diff line
@@ -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: