[SPARC32]: Add user regset support.

It is missing lazy FPU handling for the current task,
but that can be added later.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/kernel/ptrace.c b/arch/sparc/kernel/ptrace.c
index 7452269bba2a680a2fa192f20b7fbb1b5528b842..c1e7e6ae7c6f5642527228fd3a5222b8bfcbd5a1 100644 (file)
--- a/arch/sparc/kernel/ptrace.c
+++ b/arch/sparc/kernel/ptrace.c
@@ -1,6 +1,6 @@
 /* ptrace.c: Sparc process tracing support.
  *
- * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
+ * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
  *
  * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
  * and David Mosberger.
@@ -19,6 +19,8 @@
 #include <linux/smp_lock.h>
 #include <linux/security.h>
 #include <linux/signal.h>
+#include <linux/regset.h>
+#include <linux/elf.h>
 
 #include <asm/pgtable.h>
 #include <asm/system.h>
@@ -258,6 +260,287 @@ void ptrace_disable(struct task_struct *child)
        /* nothing to do */
 }
 
+enum sparc_regset {
+       REGSET_GENERAL,
+       REGSET_FP,
+};
+
+static int genregs32_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 = target->thread.kregs;
+       unsigned long __user *reg_window;
+       unsigned long *k = kbuf;
+       unsigned long __user *u = ubuf;
+       unsigned long reg;
+
+       if (target == current)
+               flush_user_windows();
+
+       pos /= sizeof(reg);
+       count /= sizeof(reg);
+
+       if (kbuf) {
+               for (; count > 0 && pos < 16; count--)
+                       *k++ = regs->u_regs[pos++];
+
+               reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
+               for (; count > 0 && pos < 32; count--) {
+                       if (get_user(*k++, &reg_window[pos++]))
+                               return -EFAULT;
+               }
+       } else {
+               for (; count > 0 && pos < 16; count--) {
+                       if (put_user(regs->u_regs[pos++], u++))
+                               return -EFAULT;
+               }
+
+               reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
+               for (; count > 0 && pos < 32; count--) {
+                       if (get_user(reg, &reg_window[pos++]) ||
+                           put_user(reg, u++))
+                               return -EFAULT;
+               }
+       }
+       while (count > 0) {
+               switch (pos) {
+               case 32: /* PSR */
+                       reg = regs->psr;
+                       break;
+               case 33: /* PC */
+                       reg = regs->pc;
+                       break;
+               case 34: /* NPC */
+                       reg = regs->npc;
+                       break;
+               case 35: /* Y */
+                       reg = regs->y;
+                       break;
+               case 36: /* WIM */
+               case 37: /* TBR */
+                       reg = 0;
+                       break;
+               default:
+                       goto finish;
+               }
+
+               if (kbuf)
+                       *k++ = reg;
+               else if (put_user(reg, u++))
+                       return -EFAULT;
+               pos++;
+               count--;
+       }
+finish:
+       pos *= sizeof(reg);
+       count *= sizeof(reg);
+
+       return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+                                       38 * sizeof(reg), -1);
+}
+
+static int genregs32_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 = target->thread.kregs;
+       unsigned long __user *reg_window;
+       const unsigned long *k = kbuf;
+       const unsigned long __user *u = ubuf;
+       unsigned long reg;
+
+       if (target == current)
+               flush_user_windows();
+
+       pos /= sizeof(reg);
+       count /= sizeof(reg);
+
+       if (kbuf) {
+               for (; count > 0 && pos < 16; count--)
+                       regs->u_regs[pos++] = *k++;
+
+               reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
+               for (; count > 0 && pos < 32; count--) {
+                       if (put_user(*k++, &reg_window[pos++]))
+                               return -EFAULT;
+               }
+       } else {
+               for (; count > 0 && pos < 16; count--) {
+                       if (get_user(reg, u++))
+                               return -EFAULT;
+                       regs->u_regs[pos++] = reg;
+               }
+
+               reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
+               for (; count > 0 && pos < 32; count--) {
+                       if (get_user(reg, u++) ||
+                           put_user(reg, &reg_window[pos++]))
+                               return -EFAULT;
+               }
+       }
+       while (count > 0) {
+               unsigned long psr;
+
+               if (kbuf)
+                       reg = *k++;
+               else if (get_user(reg, u++))
+                       return -EFAULT;
+
+               switch (pos) {
+               case 32: /* PSR */
+                       psr = regs->psr;
+                       psr &= ~PSR_ICC;
+                       psr |= (reg & PSR_ICC);
+                       regs->psr = psr;
+                       break;
+               case 33: /* PC */
+                       regs->pc = reg;
+                       break;
+               case 34: /* NPC */
+                       regs->npc = reg;
+                       break;
+               case 35: /* Y */
+                       regs->y = reg;
+                       break;
+               case 36: /* WIM */
+               case 37: /* TBR */
+                       break;
+               default:
+                       goto finish;
+               }
+
+               pos++;
+               count--;
+       }
+finish:
+       pos *= sizeof(reg);
+       count *= sizeof(reg);
+
+       return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+                                        38 * sizeof(reg), -1);
+}
+
+static int fpregs32_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 = target->thread.float_regs;
+       int ret = 0;
+
+#if 0
+       if (target == current)
+               save_and_clear_fpu();
+#endif
+
+       ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                 fpregs,
+                                 0, 32 * sizeof(u32));
+
+       if (!ret)
+               ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+                                              32 * sizeof(u32),
+                                              33 * sizeof(u32));
+       if (!ret)
+               ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                         &target->thread.fsr,
+                                         33 * sizeof(u32),
+                                         34 * sizeof(u32));
+
+       if (!ret) {
+               unsigned long val;
+
+               val = (1 << 8) | (8 << 16);
+               ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                         &val,
+                                         34 * sizeof(u32),
+                                         35 * sizeof(u32));
+       }
+
+       if (!ret)
+               ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+                                              35 * sizeof(u32), -1);
+
+       return ret;
+}
+
+static int fpregs32_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 = target->thread.float_regs;
+       int ret;
+
+#if 0
+       if (target == current)
+               save_and_clear_fpu();
+#endif
+       ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                fpregs,
+                                0, 32 * sizeof(u32));
+       if (!ret)
+               user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+                                         32 * sizeof(u32),
+                                         33 * sizeof(u32));
+       if (!ret && count > 0) {
+               ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                        &target->thread.fsr,
+                                        33 * sizeof(u32),
+                                        34 * sizeof(u32));
+       }
+
+       if (!ret)
+               ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+                                               34 * sizeof(u32), -1);
+       return ret;
+}
+
+static const struct user_regset sparc32_regsets[] = {
+       /* Format is:
+        *      G0 --> G7
+        *      O0 --> O7
+        *      L0 --> L7
+        *      I0 --> I7
+        *      PSR, PC, nPC, Y, WIM, TBR
+        */
+       [REGSET_GENERAL] = {
+               .core_note_type = NT_PRSTATUS,
+               .n = 38 * sizeof(u32),
+               .size = sizeof(u32), .align = sizeof(u32),
+               .get = genregs32_get, .set = genregs32_set
+       },
+       /* Format is:
+        *      F0 --> F31
+        *      empty 32-bit word
+        *      FSR (32--bit word)
+        *      FPU QUEUE COUNT (8-bit char)
+        *      FPU QUEUE ENTRYSIZE (8-bit char)
+        *      FPU ENABLED (8-bit char)
+        *      empty 8-bit char
+        *      FPU QUEUE (64 32-bit ints)
+        */
+       [REGSET_FP] = {
+               .core_note_type = NT_PRFPREG,
+               .n = 99 * sizeof(u32),
+               .size = sizeof(u32), .align = sizeof(u32),
+               .get = fpregs32_get, .set = fpregs32_set
+       },
+};
+
+static const struct user_regset_view user_sparc32_view = {
+       .name = "sparc", .e_machine = EM_SPARC,
+       .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+       return &user_sparc32_view;
+}
+
 asmlinkage void do_ptrace(struct pt_regs *regs)
 {
        unsigned long request = regs->u_regs[UREG_I0];