sparc64: get rid of odd callers of copy_regset_from_user()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-06-07 00:34:26 -04:00
parent 98a7fbf391
commit b7e46c527d
1 changed files with 144 additions and 33 deletions

View File

@ -541,6 +541,60 @@ static int getregs64_get(struct task_struct *target,
return ret;
}
static int setregs64_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct pt_regs *regs = task_pt_regs(target);
unsigned long y = regs->y;
unsigned long tstate;
int ret;
if (target == current)
flushw_user();
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
regs->u_regs + 1,
0 * sizeof(u64),
15 * sizeof(u64));
if (ret)
return ret;
ret =user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
15 * sizeof(u64), 16 * sizeof(u64));
if (ret)
return ret;
/* TSTATE */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&tstate,
16 * sizeof(u64),
17 * sizeof(u64));
if (ret)
return ret;
/* Only the condition codes and the "in syscall"
* state can be modified in the %tstate register.
*/
tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
regs->tstate |= tstate;
/* TPC, TNPC */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&regs->tpc,
17 * sizeof(u64),
19 * sizeof(u64));
if (ret)
return ret;
/* Y */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&y,
19 * sizeof(u64),
20 * sizeof(u64));
if (!ret)
regs->y = y;
return ret;
}
static const struct user_regset ptrace64_regsets[] = {
/* Format is:
* G1 --> G7
@ -549,7 +603,8 @@ static const struct user_regset ptrace64_regsets[] = {
* TSTATE, TPC, TNPC, Y
*/
[REGSET_GENERAL] = {
.n = 20, .size = sizeof(u64), .get = getregs64_get,
.n = 20, .size = sizeof(u64),
.get = getregs64_get, .set = setregs64_set,
},
};
@ -914,6 +969,40 @@ static int getregs_get(struct task_struct *target,
0, 19 * sizeof(u32));
}
static int setregs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct pt_regs *regs = task_pt_regs(target);
unsigned long tstate;
u32 uregs[19];
int i, ret;
if (target == current)
flushw_user();
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
uregs,
0, 19 * sizeof(u32));
if (ret)
return ret;
tstate = regs->tstate;
tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
tstate |= psr_to_tstate_icc(uregs[0]);
if (uregs[0] & PSR_SYSCALL)
tstate |= TSTATE_SYSCALL;
regs->tstate = tstate;
regs->tpc = uregs[1];
regs->tnpc = uregs[2];
regs->y = uregs[3];
for (i = 1; i < 15; i++)
regs->u_regs[i] = uregs[3 + i];
return 0;
}
static int getfpregs_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
@ -948,12 +1037,52 @@ static int getfpregs_get(struct task_struct *target,
return ret;
}
static int setfpregs_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 *fpregs = task_thread_info(target)->fpregs;
unsigned long fprs;
int ret;
if (target == current)
save_and_clear_fpu();
fprs = task_thread_info(target)->fpsaved[0];
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
fpregs,
0, 32 * sizeof(u32));
if (!ret) {
compat_ulong_t fsr;
unsigned long val;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&fsr,
32 * sizeof(u32),
33 * sizeof(u32));
if (!ret) {
val = task_thread_info(target)->xfsr[0];
val &= 0xffffffff00000000UL;
val |= fsr;
task_thread_info(target)->xfsr[0] = val;
}
}
fprs |= (FPRS_FEF | FPRS_DL);
task_thread_info(target)->fpsaved[0] = fprs;
return ret;
}
static const struct user_regset ptrace32_regsets[] = {
[REGSET_GENERAL] = {
.n = 19, .size = sizeof(u32), .get = getregs_get,
.n = 19, .size = sizeof(u32),
.get = getregs_get, .set = setregs_set,
},
[REGSET_FP] = {
.n = 68, .size = sizeof(u32), .get = getfpregs_get,
.n = 68, .size = sizeof(u32),
.get = getfpregs_get, .set = setfpregs_set,
},
};
@ -992,7 +1121,6 @@ struct compat_fps {
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
compat_ulong_t caddr, compat_ulong_t cdata)
{
const struct user_regset_view *view = task_user_regset_view(current);
compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
struct pt_regs32 __user *pregs;
struct compat_fps __user *fps;
@ -1017,15 +1145,10 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
break;
case PTRACE_SETREGS:
ret = copy_regset_from_user(child, view, REGSET_GENERAL,
32 * sizeof(u32),
4 * sizeof(u32),
&pregs->psr);
if (!ret)
ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1 * sizeof(u32),
15 * sizeof(u32),
&pregs->u_regs[0]);
ret = copy_regset_from_user(child, &ptrace32_view,
REGSET_GENERAL, 0,
19 * sizeof(u32),
pregs);
break;
case PTRACE_GETFPREGS:
@ -1036,15 +1159,10 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
break;
case PTRACE_SETFPREGS:
ret = copy_regset_from_user(child, view, REGSET_FP,
0 * sizeof(u32),
32 * sizeof(u32),
&fps->regs[0]);
if (!ret)
ret = copy_regset_from_user(child, view, REGSET_FP,
33 * sizeof(u32),
1 * sizeof(u32),
&fps->fsr);
ret = copy_regset_from_user(child, &ptrace32_view,
REGSET_FP, 0,
33 * sizeof(u32),
fps);
break;
case PTRACE_READTEXT:
@ -1110,17 +1228,10 @@ long arch_ptrace(struct task_struct *child, long request,
break;
case PTRACE_SETREGS64:
ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1 * sizeof(u64),
15 * sizeof(u64),
&pregs->u_regs[0]);
if (!ret) {
/* XXX doesn't handle 'y' register correctly XXX */
ret = copy_regset_from_user(child, view, REGSET_GENERAL,
32 * sizeof(u64),
4 * sizeof(u64),
&pregs->tstate);
}
ret = copy_regset_from_user(child, &ptrace64_view,
REGSET_GENERAL, 0,
19 * sizeof(u64),
pregs);
break;
case PTRACE_GETFPREGS64: