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Diffstat (limited to 'arch/mips/kernel/ptrace.c')
-rw-r--r--arch/mips/kernel/ptrace.c254
1 files changed, 253 insertions, 1 deletions
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 9f6c3f2aa2e2..e5ba56c01ee0 100644
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -41,6 +41,7 @@
#include <asm/mipsmtregs.h>
#include <asm/pgtable.h>
#include <asm/page.h>
+#include <asm/processor.h>
#include <asm/syscall.h>
#include <linux/uaccess.h>
#include <asm/bootinfo.h>
@@ -589,9 +590,226 @@ static int fpr_set(struct task_struct *target,
return err;
}
+#if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
+
+/*
+ * Copy the DSP context to the supplied 32-bit NT_MIPS_DSP buffer.
+ */
+static int dsp32_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ unsigned int start, num_regs, i;
+ u32 dspregs[NUM_DSP_REGS + 1];
+
+ BUG_ON(count % sizeof(u32));
+
+ if (!cpu_has_dsp)
+ return -EIO;
+
+ start = pos / sizeof(u32);
+ num_regs = count / sizeof(u32);
+
+ if (start + num_regs > NUM_DSP_REGS + 1)
+ return -EIO;
+
+ for (i = start; i < num_regs; i++)
+ switch (i) {
+ case 0 ... NUM_DSP_REGS - 1:
+ dspregs[i] = target->thread.dsp.dspr[i];
+ break;
+ case NUM_DSP_REGS:
+ dspregs[i] = target->thread.dsp.dspcontrol;
+ break;
+ }
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf, dspregs, 0,
+ sizeof(dspregs));
+}
+
+/*
+ * Copy the supplied 32-bit NT_MIPS_DSP buffer to the DSP context.
+ */
+static int dsp32_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ unsigned int start, num_regs, i;
+ u32 dspregs[NUM_DSP_REGS + 1];
+ int err;
+
+ BUG_ON(count % sizeof(u32));
+
+ if (!cpu_has_dsp)
+ return -EIO;
+
+ start = pos / sizeof(u32);
+ num_regs = count / sizeof(u32);
+
+ if (start + num_regs > NUM_DSP_REGS + 1)
+ return -EIO;
+
+ err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, dspregs, 0,
+ sizeof(dspregs));
+ if (err)
+ return err;
+
+ for (i = start; i < num_regs; i++)
+ switch (i) {
+ case 0 ... NUM_DSP_REGS - 1:
+ target->thread.dsp.dspr[i] = (s32)dspregs[i];
+ break;
+ case NUM_DSP_REGS:
+ target->thread.dsp.dspcontrol = (s32)dspregs[i];
+ break;
+ }
+
+ return 0;
+}
+
+#endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
+
+#ifdef CONFIG_64BIT
+
+/*
+ * Copy the DSP context to the supplied 64-bit NT_MIPS_DSP buffer.
+ */
+static int dsp64_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ unsigned int start, num_regs, i;
+ u64 dspregs[NUM_DSP_REGS + 1];
+
+ BUG_ON(count % sizeof(u64));
+
+ if (!cpu_has_dsp)
+ return -EIO;
+
+ start = pos / sizeof(u64);
+ num_regs = count / sizeof(u64);
+
+ if (start + num_regs > NUM_DSP_REGS + 1)
+ return -EIO;
+
+ for (i = start; i < num_regs; i++)
+ switch (i) {
+ case 0 ... NUM_DSP_REGS - 1:
+ dspregs[i] = target->thread.dsp.dspr[i];
+ break;
+ case NUM_DSP_REGS:
+ dspregs[i] = target->thread.dsp.dspcontrol;
+ break;
+ }
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf, dspregs, 0,
+ sizeof(dspregs));
+}
+
+/*
+ * Copy the supplied 64-bit NT_MIPS_DSP buffer to the DSP context.
+ */
+static int dsp64_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ unsigned int start, num_regs, i;
+ u64 dspregs[NUM_DSP_REGS + 1];
+ int err;
+
+ BUG_ON(count % sizeof(u64));
+
+ if (!cpu_has_dsp)
+ return -EIO;
+
+ start = pos / sizeof(u64);
+ num_regs = count / sizeof(u64);
+
+ if (start + num_regs > NUM_DSP_REGS + 1)
+ return -EIO;
+
+ err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, dspregs, 0,
+ sizeof(dspregs));
+ if (err)
+ return err;
+
+ for (i = start; i < num_regs; i++)
+ switch (i) {
+ case 0 ... NUM_DSP_REGS - 1:
+ target->thread.dsp.dspr[i] = dspregs[i];
+ break;
+ case NUM_DSP_REGS:
+ target->thread.dsp.dspcontrol = dspregs[i];
+ break;
+ }
+
+ return 0;
+}
+
+#endif /* CONFIG_64BIT */
+
+/*
+ * Determine whether the DSP context is present.
+ */
+static int dsp_active(struct task_struct *target,
+ const struct user_regset *regset)
+{
+ return cpu_has_dsp ? NUM_DSP_REGS + 1 : -ENODEV;
+}
+
+/* Copy the FP mode setting to the supplied NT_MIPS_FP_MODE buffer. */
+static int fp_mode_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ int fp_mode;
+
+ fp_mode = mips_get_process_fp_mode(target);
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &fp_mode, 0,
+ sizeof(fp_mode));
+}
+
+/*
+ * Copy the supplied NT_MIPS_FP_MODE buffer to the FP mode setting.
+ *
+ * We optimize for the case where `count % sizeof(int) == 0', which
+ * is supposed to have been guaranteed by the kernel before calling
+ * us, e.g. in `ptrace_regset'. We enforce that requirement, so
+ * that we can safely avoid preinitializing temporaries for partial
+ * mode writes.
+ */
+static int fp_mode_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int fp_mode;
+ int err;
+
+ BUG_ON(count % sizeof(int));
+
+ if (pos + count > sizeof(fp_mode))
+ return -EIO;
+
+ err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fp_mode, 0,
+ sizeof(fp_mode));
+ if (err)
+ return err;
+
+ if (count > 0)
+ err = mips_set_process_fp_mode(target, fp_mode);
+
+ return err;
+}
+
enum mips_regset {
REGSET_GPR,
REGSET_FPR,
+ REGSET_DSP,
+ REGSET_FP_MODE,
};
struct pt_regs_offset {
@@ -697,6 +915,23 @@ static const struct user_regset mips_regsets[] = {
.get = fpr_get,
.set = fpr_set,
},
+ [REGSET_DSP] = {
+ .core_note_type = NT_MIPS_DSP,
+ .n = NUM_DSP_REGS + 1,
+ .size = sizeof(u32),
+ .align = sizeof(u32),
+ .get = dsp32_get,
+ .set = dsp32_set,
+ .active = dsp_active,
+ },
+ [REGSET_FP_MODE] = {
+ .core_note_type = NT_MIPS_FP_MODE,
+ .n = 1,
+ .size = sizeof(int),
+ .align = sizeof(int),
+ .get = fp_mode_get,
+ .set = fp_mode_set,
+ },
};
static const struct user_regset_view user_mips_view = {
@@ -728,6 +963,23 @@ static const struct user_regset mips64_regsets[] = {
.get = fpr_get,
.set = fpr_set,
},
+ [REGSET_DSP] = {
+ .core_note_type = NT_MIPS_DSP,
+ .n = NUM_DSP_REGS + 1,
+ .size = sizeof(u64),
+ .align = sizeof(u64),
+ .get = dsp64_get,
+ .set = dsp64_set,
+ .active = dsp_active,
+ },
+ [REGSET_FP_MODE] = {
+ .core_note_type = NT_MIPS_FP_MODE,
+ .n = 1,
+ .size = sizeof(int),
+ .align = sizeof(int),
+ .get = fp_mode_get,
+ .set = fp_mode_set,
+ },
};
static const struct user_regset_view user_mips64_view = {
@@ -856,7 +1108,7 @@ long arch_ptrace(struct task_struct *child, long request,
goto out;
}
dregs = __get_dsp_regs(child);
- tmp = (unsigned long) (dregs[addr - DSP_BASE]);
+ tmp = dregs[addr - DSP_BASE];
break;
}
case DSP_CONTROL:
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.