[SPARC64]: Add user regsets.
authorDavid S. Miller <davem@davemloft.net>
Thu, 7 Feb 2008 07:02:08 +0000 (23:02 -0800)
committerDavid S. Miller <davem@davemloft.net>
Thu, 7 Feb 2008 10:58:58 +0000 (02:58 -0800)
Signed-off-by: David S. Miller <davem@davemloft.net>
arch/sparc64/kernel/ptrace.c

index 81111a12f0a83bffe186c418048734f9a3493683..668f569498b69f0f59bc74c7372215e87db37527 100644 (file)
@@ -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)
  * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  *
  * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
@@ -22,6 +22,9 @@
 #include <linux/seccomp.h>
 #include <linux/audit.h>
 #include <linux/signal.h>
+#include <linux/regset.h>
+#include <linux/compat.h>
+#include <linux/elf.h>
 
 #include <asm/asi.h>
 #include <asm/pgtable.h>
@@ -167,6 +170,583 @@ void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
        }
 }
 
+enum sparc_regset {
+       REGSET_GENERAL,
+       REGSET_FP,
+};
+
+static int genregs64_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,
+                                 0, 16 * sizeof(u64));
+       if (!ret) {
+               unsigned long __user *reg_window = (unsigned long __user *)
+                       (regs->u_regs[UREG_I6] + STACK_BIAS);
+               unsigned long window[16];
+
+               if (copy_from_user(window, reg_window, sizeof(window)))
+                       return -EFAULT;
+
+               ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                         window,
+                                         16 * sizeof(u64),
+                                         32 * sizeof(u64));
+       }
+
+       if (!ret) {
+               /* TSTATE, TPC, TNPC */
+               ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                         &regs->tstate,
+                                         32 * sizeof(u64),
+                                         35 * sizeof(u64));
+       }
+
+       if (!ret) {
+               unsigned long y = regs->y;
+
+               ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                         &y,
+                                         35 * sizeof(u64),
+                                         36 * sizeof(u64));
+       }
+
+       if (!ret)
+               ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+                                              36 * sizeof(u64), -1);
+
+       return ret;
+}
+
+static int genregs64_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);
+       int ret;
+
+       if (target == current)
+               flushw_user();
+
+       ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                regs->u_regs,
+                                0, 16 * sizeof(u64));
+       if (!ret && count > 0) {
+               unsigned long __user *reg_window = (unsigned long __user *)
+                       (regs->u_regs[UREG_I6] + STACK_BIAS);
+               unsigned long window[16];
+
+               if (copy_from_user(window, reg_window, sizeof(window)))
+                       return -EFAULT;
+
+               ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                        window,
+                                        16 * sizeof(u64),
+                                        32 * sizeof(u64));
+               if (!ret &&
+                   copy_to_user(reg_window, window, sizeof(window)))
+                       return -EFAULT;
+       }
+
+       if (!ret && count > 0) {
+               unsigned long tstate;
+
+               /* TSTATE */
+               ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                        &tstate,
+                                        32 * sizeof(u64),
+                                        33 * sizeof(u64));
+               if (!ret) {
+                       /* Only the condition codes can be modified
+                        * in the %tstate register.
+                        */
+                       tstate &= (TSTATE_ICC | TSTATE_XCC);
+                       regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
+                       regs->tstate |= tstate;
+               }
+       }
+
+       if (!ret) {
+               /* TPC, TNPC */
+               ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                        &regs->tpc,
+                                        33 * sizeof(u64),
+                                        35 * sizeof(u64));
+       }
+
+       if (!ret) {
+               unsigned long y;
+
+               ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                        &y,
+                                        35 * sizeof(u64),
+                                        36 * sizeof(u64));
+               if (!ret)
+                       regs->y = y;
+       }
+
+       if (!ret)
+               ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+                                               36 * sizeof(u64), -1);
+
+       return ret;
+}
+
+static int fpregs64_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, fsr, gsr;
+       int ret;
+
+       if (target == current)
+               save_and_clear_fpu();
+
+       fprs = task_thread_info(target)->fpsaved[0];
+
+       if (fprs & FPRS_DL)
+               ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                         fpregs,
+                                         0, 16 * sizeof(u64));
+       else
+               ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+                                              0,
+                                              16 * sizeof(u64));
+
+       if (!ret) {
+               if (fprs & FPRS_DU)
+                       ret = user_regset_copyout(&pos, &count,
+                                                 &kbuf, &ubuf,
+                                                 fpregs + 16,
+                                                 16 * sizeof(u64),
+                                                 32 * sizeof(u64));
+               else
+                       ret = user_regset_copyout_zero(&pos, &count,
+                                                      &kbuf, &ubuf,
+                                                      16 * sizeof(u64),
+                                                      32 * sizeof(u64));
+       }
+
+       if (fprs & FPRS_FEF) {
+               fsr = task_thread_info(target)->xfsr[0];
+               gsr = task_thread_info(target)->gsr[0];
+       } else {
+               fsr = gsr = 0;
+       }
+
+       if (!ret)
+               ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                         &fsr,
+                                         32 * sizeof(u64),
+                                         33 * sizeof(u64));
+       if (!ret)
+               ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                         &gsr,
+                                         33 * sizeof(u64),
+                                         34 * sizeof(u64));
+       if (!ret)
+               ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                         &fprs,
+                                         34 * sizeof(u64),
+                                         35 * sizeof(u64));
+
+       if (!ret)
+               ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+                                              35 * sizeof(u64), -1);
+
+       return ret;
+}
+
+static int fpregs64_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();
+
+       ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                fpregs,
+                                0, 32 * sizeof(u64));
+       if (!ret)
+               ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                        task_thread_info(target)->xfsr,
+                                        32 * sizeof(u64),
+                                        33 * sizeof(u64));
+       if (!ret)
+               ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                        task_thread_info(target)->gsr,
+                                        33 * sizeof(u64),
+                                        34 * sizeof(u64));
+
+       fprs = task_thread_info(target)->fpsaved[0];
+       if (!ret && count > 0) {
+               ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                        &fprs,
+                                        34 * sizeof(u64),
+                                        35 * sizeof(u64));
+       }
+
+       fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
+       task_thread_info(target)->fpsaved[0] = fprs;
+
+       if (!ret)
+               ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+                                               35 * sizeof(u64), -1);
+       return ret;
+}
+
+static const struct user_regset sparc64_regsets[] = {
+       /* Format is:
+        *      G0 --> G7
+        *      O0 --> O7
+        *      L0 --> L7
+        *      I0 --> I7
+        *      TSTATE, TPC, TNPC, Y
+        */
+       [REGSET_GENERAL] = {
+               .core_note_type = NT_PRSTATUS,
+               .n = 36 * sizeof(u64),
+               .size = sizeof(u64), .align = sizeof(u64),
+               .get = genregs64_get, .set = genregs64_set
+       },
+       /* Format is:
+        *      F0 --> F63
+        *      FSR
+        *      GSR
+        *      FPRS
+        */
+       [REGSET_FP] = {
+               .core_note_type = NT_PRFPREG,
+               .n = 35 * sizeof(u64),
+               .size = sizeof(u64), .align = sizeof(u64),
+               .get = fpregs64_get, .set = fpregs64_set
+       },
+};
+
+static const struct user_regset_view user_sparc64_view = {
+       .name = "sparc64", .e_machine = EM_SPARCV9,
+       .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
+};
+
+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 = task_pt_regs(target);
+       compat_ulong_t __user *reg_window;
+       compat_ulong_t *k = kbuf;
+       compat_ulong_t __user *u = ubuf;
+       compat_ulong_t reg;
+
+       if (target == current)
+               flushw_user();
+
+       pos /= sizeof(reg);
+       count /= sizeof(reg);
+
+       if (kbuf) {
+               for (; count > 0 && pos < 16; count--)
+                       *k++ = regs->u_regs[pos++];
+
+               reg_window = (compat_ulong_t __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((compat_ulong_t) regs->u_regs[pos++], u++))
+                               return -EFAULT;
+               }
+
+               reg_window = (compat_ulong_t __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 = tstate_to_psr(regs->tstate);
+                       break;
+               case 33: /* PC */
+                       reg = regs->tpc;
+                       break;
+               case 34: /* NPC */
+                       reg = regs->tnpc;
+                       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 = task_pt_regs(target);
+       compat_ulong_t __user *reg_window;
+       const compat_ulong_t *k = kbuf;
+       const compat_ulong_t __user *u = ubuf;
+       compat_ulong_t reg;
+
+       if (target == current)
+               flushw_user();
+
+       pos /= sizeof(reg);
+       count /= sizeof(reg);
+
+       if (kbuf) {
+               for (; count > 0 && pos < 16; count--)
+                       regs->u_regs[pos++] = *k++;
+
+               reg_window = (compat_ulong_t __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 = (compat_ulong_t __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 tstate;
+
+               if (kbuf)
+                       reg = *k++;
+               else if (get_user(reg, u++))
+                       return -EFAULT;
+
+               switch (pos) {
+               case 32: /* PSR */
+                       tstate = regs->tstate;
+                       tstate &= ~(TSTATE_ICC | TSTATE_XCC);
+                       tstate |= psr_to_tstate_icc(reg);
+                       regs->tstate = tstate;
+                       break;
+               case 33: /* PC */
+                       regs->tpc = reg;
+                       break;
+               case 34: /* NPC */
+                       regs->tnpc = 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 = task_thread_info(target)->fpregs;
+       compat_ulong_t enabled;
+       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];
+               enabled = 1;
+       } else {
+               fsr = 0;
+               enabled = 0;
+       }
+
+       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,
+                                         &fsr,
+                                         33 * sizeof(u32),
+                                         34 * sizeof(u32));
+
+       if (!ret) {
+               compat_ulong_t val;
+
+               val = (enabled << 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 = 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)
+               user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+                                         32 * sizeof(u32),
+                                         33 * sizeof(u32));
+       if (!ret && count > 0) {
+               compat_ulong_t fsr;
+               unsigned long val;
+
+               ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                        &fsr,
+                                        33 * sizeof(u32),
+                                        34 * 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;
+
+       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)
+{
+       if (test_tsk_thread_flag(task, TIF_32BIT))
+               return &user_sparc32_view;
+       return &user_sparc64_view;
+}
+
 asmlinkage void do_ptrace(struct pt_regs *regs)
 {
        int request = regs->u_regs[UREG_I0];