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sparc64: Clean up handling of pt_regs trap type encoding.

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If we use this from more than one place, it's better to
have helpers instead of twiddling magic constants all
over.

Add pt_regs_trap_type(), pt_regs_clear_trap_type(), and
pt_regs_is_syscall().

Use them in do_signal().

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-04-27 14:52:51 -07:00
parent 5526b7e451
commit 90888816ba
2 changed files with 25 additions and 5 deletions
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7
arch/sparc64/kernel/signal.c
View file

@ -513,11 +513,10 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
struct k_sigaction ka;
sigset_t *oldset;
siginfo_t info;
int signr, tt;
int signr;
tt = regs->magic & 0x1ff;
if (tt == 0x110 || tt == 0x111 || tt == 0x16d) {
regs->magic &= ~0x1ff;
if (pt_regs_is_syscall(regs)) {
pt_regs_clear_trap_type(regs);
cookie.restart_syscall = 1;
} else
cookie.restart_syscall = 0;

23
include/asm-sparc64/ptrace.h
View file

@ -1,4 +1,3 @@
/* $Id: ptrace.h,v 1.14 2002/02/09 19:49:32 davem Exp $ */
#ifndef _SPARC64_PTRACE_H
#define _SPARC64_PTRACE_H
@ -8,10 +7,15 @@
* stack during a system call and basically all traps.
*/
/* This magic value must have the low 9 bits clear,
* as that is where we encode the %tt value, see below.
*/
#define PT_REGS_MAGIC 0x57ac6c00
#ifndef __ASSEMBLY__
#include <linux/types.h>
struct pt_regs {
unsigned long u_regs[16]; /* globals and ins */
unsigned long tstate;
@ -33,6 +37,23 @@ struct pt_regs {
unsigned int magic;
};
static inline int pt_regs_trap_type(struct pt_regs *regs)
{
return regs->magic & 0x1ff;
}
static inline int pt_regs_clear_trap_type(struct pt_regs *regs)
{
return regs->magic &= ~0x1ff;
}
static inline bool pt_regs_is_syscall(struct pt_regs *regs)
{
int tt = pt_regs_trap_type(regs);
return (tt == 0x110 || tt == 0x111 || tt == 0x16d);
}
struct pt_regs32 {
unsigned int psr;
unsigned int pc;