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Subject[PATCH 11/41] sparc64: get rid of odd callers of copy_regset_to_user()
Date
From: Al Viro <viro@zeniv.linux.org.uk>

same as for sparc32, and that's it - no more caller of ->get() with
non-zero pos.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
arch/sparc/kernel/ptrace_64.c | 175 ++++++++++++++++++++++++++++++++----------
1 file changed, 136 insertions(+), 39 deletions(-)

diff --git a/arch/sparc/kernel/ptrace_64.c b/arch/sparc/kernel/ptrace_64.c
index f7b2ddfc81d6..1b1910b67ca4 100644
--- a/arch/sparc/kernel/ptrace_64.c
+++ b/arch/sparc/kernel/ptrace_64.c
@@ -258,7 +258,7 @@ static int genregs64_get(struct task_struct *target,
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
regs->u_regs,
0, 16 * sizeof(u64));
- if (!ret && count && pos < (32 * sizeof(u64))) {
+ if (!ret && count) {
struct reg_window window;

if (regwindow64_get(target, regs, &window))
@@ -506,6 +506,57 @@ static const struct user_regset sparc64_regsets[] = {
},
};

+static int getregs64_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ const struct pt_regs *regs = task_pt_regs(target);
+ int ret;
+
+ if (target == current)
+ flushw_user();
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ regs->u_regs + 1,
+ 0, 15 * sizeof(u64));
+ if (!ret)
+ ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ 15 * sizeof(u64), 16 * sizeof(u64));
+ if (!ret) {
+ /* TSTATE, TPC, TNPC */
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &regs->tstate,
+ 16 * sizeof(u64),
+ 19 * sizeof(u64));
+ }
+ if (!ret) {
+ unsigned long y = regs->y;
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &y,
+ 19 * sizeof(u64),
+ 20 * sizeof(u64));
+ }
+ return ret;
+}
+
+static const struct user_regset ptrace64_regsets[] = {
+ /* Format is:
+ * G1 --> G7
+ * O0 --> O7
+ * 0
+ * TSTATE, TPC, TNPC, Y
+ */
+ [REGSET_GENERAL] = {
+ .n = 20, .size = sizeof(u64), .get = getregs64_get,
+ },
+};
+
+static const struct user_regset_view ptrace64_view = {
+ .regsets = ptrace64_regsets, .n = ARRAY_SIZE(ptrace64_regsets)
+};
+
static const struct user_regset_view user_sparc64_view = {
.name = "sparc64", .e_machine = EM_SPARCV9,
.regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
@@ -533,7 +584,7 @@ static int genregs32_get(struct task_struct *target,
for (; count > 0 && pos < 16; count--)
*k++ = regs->u_regs[pos++];

- if (count && pos < 32) {
+ if (count) {
if (get_from_target(target, regs->u_regs[UREG_I6],
uregs, sizeof(uregs)))
return -EFAULT;
@@ -545,7 +596,7 @@ static int genregs32_get(struct task_struct *target,
for (; count > 0 && pos < 16; count--)
if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
return -EFAULT;
- if (count && pos < 32) {
+ if (count) {
if (get_from_target(target, regs->u_regs[UREG_I6],
uregs, sizeof(uregs)))
return -EFAULT;
@@ -840,6 +891,76 @@ static const struct user_regset sparc32_regsets[] = {
},
};

+static int getregs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ const struct pt_regs *regs = task_pt_regs(target);
+ u32 uregs[19];
+ int i;
+
+ if (target == current)
+ flushw_user();
+
+ uregs[0] = tstate_to_psr(regs->tstate);
+ uregs[1] = regs->tpc;
+ uregs[2] = regs->tnpc;
+ uregs[3] = regs->y;
+ for (i = 1; i < 16; i++)
+ uregs[3 + i] = regs->u_regs[i];
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ uregs,
+ 0, 19 * sizeof(u32));
+}
+
+static int getfpregs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ const unsigned long *fpregs = task_thread_info(target)->fpregs;
+ unsigned long fprs;
+ compat_ulong_t fsr;
+ int ret = 0;
+
+ if (target == current)
+ save_and_clear_fpu();
+
+ fprs = task_thread_info(target)->fpsaved[0];
+ if (fprs & FPRS_FEF) {
+ fsr = task_thread_info(target)->xfsr[0];
+ } else {
+ fsr = 0;
+ }
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ fpregs,
+ 0, 32 * sizeof(u32));
+ if (!ret)
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &fsr,
+ 32 * sizeof(u32),
+ 33 * sizeof(u32));
+ if (!ret)
+ ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ 33 * sizeof(u32), 68 * sizeof(u32));
+ return ret;
+}
+
+static const struct user_regset ptrace32_regsets[] = {
+ [REGSET_GENERAL] = {
+ .n = 19, .size = sizeof(u32), .get = getregs_get,
+ },
+ [REGSET_FP] = {
+ .n = 68, .size = sizeof(u32), .get = getfpregs_get,
+ },
+};
+
+static const struct user_regset_view ptrace32_view = {
+ .regsets = ptrace32_regsets, .n = ARRAY_SIZE(ptrace32_regsets)
+};
+
static const struct user_regset_view user_sparc32_view = {
.name = "sparc", .e_machine = EM_SPARC,
.regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
@@ -889,15 +1010,10 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
break;

case PTRACE_GETREGS:
- ret = copy_regset_to_user(child, view, REGSET_GENERAL,
- 32 * sizeof(u32),
- 4 * sizeof(u32),
- &pregs->psr);
- if (!ret)
- ret = copy_regset_to_user(child, view, REGSET_GENERAL,
- 1 * sizeof(u32),
- 15 * sizeof(u32),
- &pregs->u_regs[0]);
+ ret = copy_regset_to_user(child, &ptrace32_view,
+ REGSET_GENERAL, 0,
+ 19 * sizeof(u32),
+ pregs);
break;

case PTRACE_SETREGS:
@@ -913,22 +1029,10 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
break;

case PTRACE_GETFPREGS:
- ret = copy_regset_to_user(child, view, REGSET_FP,
- 0 * sizeof(u32),
- 32 * sizeof(u32),
- &fps->regs[0]);
- if (!ret)
- ret = copy_regset_to_user(child, view, REGSET_FP,
- 33 * sizeof(u32),
- 1 * sizeof(u32),
- &fps->fsr);
- if (!ret) {
- if (__put_user(0, &fps->flags) ||
- __put_user(0, &fps->extra) ||
- __put_user(0, &fps->fpqd) ||
- clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
- ret = -EFAULT;
- }
+ ret = copy_regset_to_user(child, &ptrace32_view,
+ REGSET_FP, 0,
+ 68 * sizeof(u32),
+ fps);
break;

case PTRACE_SETFPREGS:
@@ -999,17 +1103,10 @@ long arch_ptrace(struct task_struct *child, long request,
break;

case PTRACE_GETREGS64:
- ret = copy_regset_to_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_to_user(child, view, REGSET_GENERAL,
- 32 * sizeof(u64),
- 4 * sizeof(u64),
- &pregs->tstate);
- }
+ ret = copy_regset_to_user(child, &ptrace64_view,
+ REGSET_GENERAL, 0,
+ 19 * sizeof(u64),
+ pregs);
break;

case PTRACE_SETREGS64:
--
2.11.0
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