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[POWERPC] Use user_regset accessors for GPRs 

This implements user_regset-style accessors for the powerpc general
registers.  In the future these functions will be the only place that
needs to understand the user_regset layout (core dump format) and how
it maps to the internal representation of user thread state.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Roland McGrath 2007-12-20 03:57:55 -08:00 committed by Paul Mackerras
parent 26f7713020
commit 44dd3f50d3
1 changed files with 91 additions and 0 deletions
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91
arch/powerpc/kernel/ptrace.c
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@ -119,6 +119,97 @@ int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
return -EIO;
}
static int gpr_get(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
int ret;
if (target->thread.regs == NULL)
return -EIO;
CHECK_FULL_REGS(target->thread.regs);
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
target->thread.regs,
0, offsetof(struct pt_regs, msr));
if (!ret) {
unsigned long msr = get_user_msr(target);
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &msr,
offsetof(struct pt_regs, msr),
offsetof(struct pt_regs, msr) +
sizeof(msr));
}
BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
offsetof(struct pt_regs, msr) + sizeof(long));
if (!ret)
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&target->thread.regs->orig_gpr3,
offsetof(struct pt_regs, orig_gpr3),
sizeof(struct pt_regs));
if (!ret)
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
sizeof(struct pt_regs), -1);
return ret;
}
static int gpr_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
unsigned long reg;
int ret;
if (target->thread.regs == NULL)
return -EIO;
CHECK_FULL_REGS(target->thread.regs);
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
target->thread.regs,
0, PT_MSR * sizeof(reg));
if (!ret && count > 0) {
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
PT_MSR * sizeof(reg),
(PT_MSR + 1) * sizeof(reg));
if (!ret)
ret = set_user_msr(target, reg);
}
BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
offsetof(struct pt_regs, msr) + sizeof(long));
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.regs->orig_gpr3,
PT_ORIG_R3 * sizeof(reg),
(PT_MAX_PUT_REG + 1) * sizeof(reg));
if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
ret = user_regset_copyin_ignore(
&pos, &count, &kbuf, &ubuf,
(PT_MAX_PUT_REG + 1) * sizeof(reg),
PT_TRAP * sizeof(reg));
if (!ret && count > 0) {
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
PT_TRAP * sizeof(reg),
(PT_TRAP + 1) * sizeof(reg));
if (!ret)
ret = set_user_trap(target, reg);
}
if (!ret)
ret = user_regset_copyin_ignore(
&pos, &count, &kbuf, &ubuf,
(PT_TRAP + 1) * sizeof(reg), -1);
return ret;
}
static int fpr_get(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,