[SPARC64]: Add user regsets.

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

1 files changed, 581 insertions, 1 deletions

diff --git a/arch/sparc64/kernel/ptrace.c b/arch/sparc64/kernel/ptrace.c
index 81111a12f0a8..668f569498b6 100644
--- a/arch/sparc64/kernel/ptrace.c
+++ b/arch/sparc64/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)
  * 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];