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Subject[RFC PATCH 32/43] ptrace, powerpc: cleanup arch_ptrace()
Date
use new 'datap' variable in order to remove unnecessary castings.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
---
arch/powerpc/kernel/ptrace.c | 55 +++++++++++++++++++++++-------------------
1 files changed, 30 insertions(+), 25 deletions(-)

diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index e4b6d75..0047bf9 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -1409,26 +1409,28 @@ static long ppc_del_hwdebug(struct task_struct *child, long addr, long data)
static long arch_ptrace_old(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
+ void __user *datap = (void __user *) data;
+
switch (request) {
case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
return copy_regset_to_user(child, &user_ppc_native_view,
REGSET_GPR, 0, 32 * sizeof(long),
- (void __user *) data);
+ datap);

case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
return copy_regset_from_user(child, &user_ppc_native_view,
REGSET_GPR, 0, 32 * sizeof(long),
- (const void __user *) data);
+ datap);

case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
return copy_regset_to_user(child, &user_ppc_native_view,
REGSET_FPR, 0, 32 * sizeof(double),
- (void __user *) data);
+ datap);

case PPC_PTRACE_SETFPREGS: /* Set FPRs 0 - 31. */
return copy_regset_from_user(child, &user_ppc_native_view,
REGSET_FPR, 0, 32 * sizeof(double),
- (const void __user *) data);
+ datap);
}

return -EPERM;
@@ -1438,6 +1440,7 @@ long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
int ret = -EPERM;
+ void __user *datap = (void __user *) data;

switch (request) {
/* read the word at location addr in the USER area. */
@@ -1464,7 +1467,8 @@ long arch_ptrace(struct task_struct *child, long request,
tmp = ((unsigned long *)child->thread.fpr)
[TS_FPRWIDTH * (index - PT_FPR0)];
}
- ret = put_user(tmp,(unsigned long __user *) data);
+ ret = copy_to_user(datap, &tmp, sizeof(tmp)) ?
+ -EFAULT : 0;
break;
}

@@ -1526,11 +1530,11 @@ long arch_ptrace(struct task_struct *child, long request,
dbginfo.features = 0;
#endif /* CONFIG_PPC_ADV_DEBUG_REGS */

- if (!access_ok(VERIFY_WRITE, data,
+ if (!access_ok(VERIFY_WRITE, datap,
sizeof(struct ppc_debug_info)))
return -EFAULT;
- ret = __copy_to_user((struct ppc_debug_info __user *)data,
- &dbginfo, sizeof(struct ppc_debug_info)) ?
+ ret = __copy_to_user(datap, &dbginfo,
+ sizeof(struct ppc_debug_info)) ?
-EFAULT : 0;
break;
}
@@ -1538,11 +1542,10 @@ long arch_ptrace(struct task_struct *child, long request,
case PPC_PTRACE_SETHWDEBUG: {
struct ppc_hw_breakpoint bp_info;

- if (!access_ok(VERIFY_READ, data,
+ if (!access_ok(VERIFY_READ, datap,
sizeof(struct ppc_hw_breakpoint)))
return -EFAULT;
- ret = __copy_from_user(&bp_info,
- (struct ppc_hw_breakpoint __user *)data,
+ ret = __copy_from_user(&bp_info, datap,
sizeof(struct ppc_hw_breakpoint)) ?
-EFAULT : 0;
if (!ret)
@@ -1561,11 +1564,13 @@ long arch_ptrace(struct task_struct *child, long request,
if (addr > 0)
break;
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
- ret = put_user(child->thread.dac1,
- (unsigned long __user *)data);
+ ret = copy_to_user(datap, child->thread.dac1,
+ sizeof(child->thread.dac1)) ?
+ -EFAULT : 0;
#else
- ret = put_user(child->thread.dabr,
- (unsigned long __user *)data);
+ ret = copy_to_user(datap, child->thread.dabr,
+ sizeof(child->thread.dabr)) ?
+ -EFAULT : 0;
#endif
break;
}
@@ -1581,7 +1586,7 @@ long arch_ptrace(struct task_struct *child, long request,
return copy_regset_to_user(child, &user_ppc_native_view,
REGSET_GPR,
0, sizeof(struct pt_regs),
- (void __user *) data);
+ datap);

#ifdef CONFIG_PPC64
case PTRACE_SETREGS64:
@@ -1590,19 +1595,19 @@ long arch_ptrace(struct task_struct *child, long request,
return copy_regset_from_user(child, &user_ppc_native_view,
REGSET_GPR,
0, sizeof(struct pt_regs),
- (const void __user *) data);
+ datap);

case PTRACE_GETFPREGS: /* Get the child FPU state (FPR0...31 + FPSCR) */
return copy_regset_to_user(child, &user_ppc_native_view,
REGSET_FPR,
0, sizeof(elf_fpregset_t),
- (void __user *) data);
+ datap);

case PTRACE_SETFPREGS: /* Set the child FPU state (FPR0...31 + FPSCR) */
return copy_regset_from_user(child, &user_ppc_native_view,
REGSET_FPR,
0, sizeof(elf_fpregset_t),
- (const void __user *) data);
+ datap);

#ifdef CONFIG_ALTIVEC
case PTRACE_GETVRREGS:
@@ -1610,40 +1615,40 @@ long arch_ptrace(struct task_struct *child, long request,
REGSET_VMX,
0, (33 * sizeof(vector128) +
sizeof(u32)),
- (void __user *) data);
+ datap);

case PTRACE_SETVRREGS:
return copy_regset_from_user(child, &user_ppc_native_view,
REGSET_VMX,
0, (33 * sizeof(vector128) +
sizeof(u32)),
- (const void __user *) data);
+ datap);
#endif
#ifdef CONFIG_VSX
case PTRACE_GETVSRREGS:
return copy_regset_to_user(child, &user_ppc_native_view,
REGSET_VSX,
0, 32 * sizeof(double),
- (void __user *) data);
+ datap);

case PTRACE_SETVSRREGS:
return copy_regset_from_user(child, &user_ppc_native_view,
REGSET_VSX,
0, 32 * sizeof(double),
- (const void __user *) data);
+ datap);
#endif
#ifdef CONFIG_SPE
case PTRACE_GETEVRREGS:
/* Get the child spe register state. */
return copy_regset_to_user(child, &user_ppc_native_view,
REGSET_SPE, 0, 35 * sizeof(u32),
- (void __user *) data);
+ datap);

case PTRACE_SETEVRREGS:
/* Set the child spe register state. */
return copy_regset_from_user(child, &user_ppc_native_view,
REGSET_SPE, 0, 35 * sizeof(u32),
- (const void __user *) data);
+ datap);
#endif

/* Old reverse args ptrace callss */
--
1.7.2.2


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