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-rw-r--r--arch/sparc/kernel/ptrace_64.c1178
1 files changed, 1178 insertions, 0 deletions
diff --git a/arch/sparc/kernel/ptrace_64.c b/arch/sparc/kernel/ptrace_64.c
new file mode 100644
index 000000000..2b92155db
--- /dev/null
+++ b/arch/sparc/kernel/ptrace_64.c
@@ -0,0 +1,1178 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* ptrace.c: Sparc process tracing support.
+ *
+ * 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,
+ * and David Mosberger.
+ *
+ * Added Linux support -miguel (weird, eh?, the original code was meant
+ * to emulate SunOS).
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/sched/task_stack.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/smp.h>
+#include <linux/security.h>
+#include <linux/seccomp.h>
+#include <linux/audit.h>
+#include <linux/signal.h>
+#include <linux/regset.h>
+#include <linux/tracehook.h>
+#include <trace/syscall.h>
+#include <linux/compat.h>
+#include <linux/elf.h>
+#include <linux/context_tracking.h>
+
+#include <asm/asi.h>
+#include <linux/uaccess.h>
+#include <asm/psrcompat.h>
+#include <asm/visasm.h>
+#include <asm/spitfire.h>
+#include <asm/page.h>
+#include <asm/cpudata.h>
+#include <asm/cacheflush.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/syscalls.h>
+
+#include "entry.h"
+
+/* #define ALLOW_INIT_TRACING */
+
+struct pt_regs_offset {
+ const char *name;
+ int offset;
+};
+
+#define REG_OFFSET_NAME(n, r) \
+ {.name = n, .offset = (PT_V9_##r)}
+#define REG_OFFSET_END {.name = NULL, .offset = 0}
+
+static const struct pt_regs_offset regoffset_table[] = {
+ REG_OFFSET_NAME("g0", G0),
+ REG_OFFSET_NAME("g1", G1),
+ REG_OFFSET_NAME("g2", G2),
+ REG_OFFSET_NAME("g3", G3),
+ REG_OFFSET_NAME("g4", G4),
+ REG_OFFSET_NAME("g5", G5),
+ REG_OFFSET_NAME("g6", G6),
+ REG_OFFSET_NAME("g7", G7),
+
+ REG_OFFSET_NAME("i0", I0),
+ REG_OFFSET_NAME("i1", I1),
+ REG_OFFSET_NAME("i2", I2),
+ REG_OFFSET_NAME("i3", I3),
+ REG_OFFSET_NAME("i4", I4),
+ REG_OFFSET_NAME("i5", I5),
+ REG_OFFSET_NAME("i6", I6),
+ REG_OFFSET_NAME("i7", I7),
+
+ REG_OFFSET_NAME("tstate", TSTATE),
+ REG_OFFSET_NAME("pc", TPC),
+ REG_OFFSET_NAME("npc", TNPC),
+ REG_OFFSET_NAME("y", Y),
+ REG_OFFSET_NAME("lr", I7),
+
+ REG_OFFSET_END,
+};
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ *
+ * Make sure single step bits etc are not set.
+ */
+void ptrace_disable(struct task_struct *child)
+{
+ /* nothing to do */
+}
+
+/* To get the necessary page struct, access_process_vm() first calls
+ * get_user_pages(). This has done a flush_dcache_page() on the
+ * accessed page. Then our caller (copy_{to,from}_user_page()) did
+ * to memcpy to read/write the data from that page.
+ *
+ * Now, the only thing we have to do is:
+ * 1) flush the D-cache if it's possible than an illegal alias
+ * has been created
+ * 2) flush the I-cache if this is pre-cheetah and we did a write
+ */
+void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
+ unsigned long uaddr, void *kaddr,
+ unsigned long len, int write)
+{
+ BUG_ON(len > PAGE_SIZE);
+
+ if (tlb_type == hypervisor)
+ return;
+
+ preempt_disable();
+
+#ifdef DCACHE_ALIASING_POSSIBLE
+ /* If bit 13 of the kernel address we used to access the
+ * user page is the same as the virtual address that page
+ * is mapped to in the user's address space, we can skip the
+ * D-cache flush.
+ */
+ if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
+ unsigned long start = __pa(kaddr);
+ unsigned long end = start + len;
+ unsigned long dcache_line_size;
+
+ dcache_line_size = local_cpu_data().dcache_line_size;
+
+ if (tlb_type == spitfire) {
+ for (; start < end; start += dcache_line_size)
+ spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
+ } else {
+ start &= ~(dcache_line_size - 1);
+ for (; start < end; start += dcache_line_size)
+ __asm__ __volatile__(
+ "stxa %%g0, [%0] %1\n\t"
+ "membar #Sync"
+ : /* no outputs */
+ : "r" (start),
+ "i" (ASI_DCACHE_INVALIDATE));
+ }
+ }
+#endif
+ if (write && tlb_type == spitfire) {
+ unsigned long start = (unsigned long) kaddr;
+ unsigned long end = start + len;
+ unsigned long icache_line_size;
+
+ icache_line_size = local_cpu_data().icache_line_size;
+
+ for (; start < end; start += icache_line_size)
+ flushi(start);
+ }
+
+ preempt_enable();
+}
+EXPORT_SYMBOL_GPL(flush_ptrace_access);
+
+static int get_from_target(struct task_struct *target, unsigned long uaddr,
+ void *kbuf, int len)
+{
+ if (target == current) {
+ if (copy_from_user(kbuf, (void __user *) uaddr, len))
+ return -EFAULT;
+ } else {
+ int len2 = access_process_vm(target, uaddr, kbuf, len,
+ FOLL_FORCE);
+ if (len2 != len)
+ return -EFAULT;
+ }
+ return 0;
+}
+
+static int set_to_target(struct task_struct *target, unsigned long uaddr,
+ void *kbuf, int len)
+{
+ if (target == current) {
+ if (copy_to_user((void __user *) uaddr, kbuf, len))
+ return -EFAULT;
+ } else {
+ int len2 = access_process_vm(target, uaddr, kbuf, len,
+ FOLL_FORCE | FOLL_WRITE);
+ if (len2 != len)
+ return -EFAULT;
+ }
+ return 0;
+}
+
+static int regwindow64_get(struct task_struct *target,
+ const struct pt_regs *regs,
+ struct reg_window *wbuf)
+{
+ unsigned long rw_addr = regs->u_regs[UREG_I6];
+
+ if (!test_thread_64bit_stack(rw_addr)) {
+ struct reg_window32 win32;
+ int i;
+
+ if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
+ return -EFAULT;
+ for (i = 0; i < 8; i++)
+ wbuf->locals[i] = win32.locals[i];
+ for (i = 0; i < 8; i++)
+ wbuf->ins[i] = win32.ins[i];
+ } else {
+ rw_addr += STACK_BIAS;
+ if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+static int regwindow64_set(struct task_struct *target,
+ const struct pt_regs *regs,
+ struct reg_window *wbuf)
+{
+ unsigned long rw_addr = regs->u_regs[UREG_I6];
+
+ if (!test_thread_64bit_stack(rw_addr)) {
+ struct reg_window32 win32;
+ int i;
+
+ for (i = 0; i < 8; i++)
+ win32.locals[i] = wbuf->locals[i];
+ for (i = 0; i < 8; i++)
+ win32.ins[i] = wbuf->ins[i];
+
+ if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
+ return -EFAULT;
+ } else {
+ rw_addr += STACK_BIAS;
+ if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+enum sparc_regset {
+ REGSET_GENERAL,
+ REGSET_FP,
+};
+
+static int genregs64_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ const struct pt_regs *regs = task_pt_regs(target);
+ struct reg_window window;
+
+ if (target == current)
+ flushw_user();
+
+ membuf_write(&to, regs->u_regs, 16 * sizeof(u64));
+ if (!to.left)
+ return 0;
+ if (regwindow64_get(target, regs, &window))
+ return -EFAULT;
+ membuf_write(&to, &window, 16 * sizeof(u64));
+ /* TSTATE, TPC, TNPC */
+ membuf_write(&to, &regs->tstate, 3 * sizeof(u64));
+ return membuf_store(&to, (u64)regs->y);
+}
+
+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 && pos < (32 * sizeof(u64))) {
+ struct reg_window window;
+
+ if (regwindow64_get(target, regs, &window))
+ return -EFAULT;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &window,
+ 16 * sizeof(u64),
+ 32 * sizeof(u64));
+
+ if (!ret &&
+ regwindow64_set(target, regs, &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 and the "in syscall"
+ * state can be modified in the %tstate register.
+ */
+ tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
+ regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
+ 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 = regs->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,
+ struct membuf to)
+{
+ struct thread_info *t = task_thread_info(target);
+ unsigned long fprs;
+
+ if (target == current)
+ save_and_clear_fpu();
+
+ fprs = t->fpsaved[0];
+
+ if (fprs & FPRS_DL)
+ membuf_write(&to, t->fpregs, 16 * sizeof(u64));
+ else
+ membuf_zero(&to, 16 * sizeof(u64));
+
+ if (fprs & FPRS_DU)
+ membuf_write(&to, t->fpregs + 16, 16 * sizeof(u64));
+ else
+ membuf_zero(&to, 16 * sizeof(u64));
+ if (fprs & FPRS_FEF) {
+ membuf_store(&to, t->xfsr[0]);
+ membuf_store(&to, t->gsr[0]);
+ } else {
+ membuf_zero(&to, 2 * sizeof(u64));
+ }
+ return membuf_store(&to, fprs);
+}
+
+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,
+ .size = sizeof(u64), .align = sizeof(u64),
+ .regset_get = genregs64_get, .set = genregs64_set
+ },
+ /* Format is:
+ * F0 --> F63
+ * FSR
+ * GSR
+ * FPRS
+ */
+ [REGSET_FP] = {
+ .core_note_type = NT_PRFPREG,
+ .n = 35,
+ .size = sizeof(u64), .align = sizeof(u64),
+ .regset_get = fpregs64_get, .set = fpregs64_set
+ },
+};
+
+static int getregs64_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ const struct pt_regs *regs = task_pt_regs(target);
+
+ if (target == current)
+ flushw_user();
+
+ membuf_write(&to, regs->u_regs + 1, 15 * sizeof(u64));
+ membuf_store(&to, (u64)0);
+ membuf_write(&to, &regs->tstate, 3 * sizeof(u64));
+ return membuf_store(&to, (u64)regs->y);
+}
+
+static int setregs64_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);
+ unsigned long y = regs->y;
+ unsigned long tstate;
+ int ret;
+
+ if (target == current)
+ flushw_user();
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ regs->u_regs + 1,
+ 0 * sizeof(u64),
+ 15 * sizeof(u64));
+ if (ret)
+ return ret;
+ ret =user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ 15 * sizeof(u64), 16 * sizeof(u64));
+ if (ret)
+ return ret;
+ /* TSTATE */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &tstate,
+ 16 * sizeof(u64),
+ 17 * sizeof(u64));
+ if (ret)
+ return ret;
+ /* Only the condition codes and the "in syscall"
+ * state can be modified in the %tstate register.
+ */
+ tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
+ regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
+ regs->tstate |= tstate;
+
+ /* TPC, TNPC */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &regs->tpc,
+ 17 * sizeof(u64),
+ 19 * sizeof(u64));
+ if (ret)
+ return ret;
+ /* Y */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &y,
+ 19 * sizeof(u64),
+ 20 * sizeof(u64));
+ if (!ret)
+ regs->y = y;
+ 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),
+ .regset_get = getregs64_get, .set = setregs64_set,
+ },
+};
+
+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)
+};
+
+#ifdef CONFIG_COMPAT
+static int genregs32_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ const struct pt_regs *regs = task_pt_regs(target);
+ u32 uregs[16];
+ int i;
+
+ if (target == current)
+ flushw_user();
+
+ for (i = 0; i < 16; i++)
+ membuf_store(&to, (u32)regs->u_regs[i]);
+ if (!to.left)
+ return 0;
+ if (get_from_target(target, regs->u_regs[UREG_I6],
+ uregs, sizeof(uregs)))
+ return -EFAULT;
+ membuf_write(&to, uregs, 16 * sizeof(u32));
+ membuf_store(&to, (u32)tstate_to_psr(regs->tstate));
+ membuf_store(&to, (u32)(regs->tpc));
+ membuf_store(&to, (u32)(regs->tnpc));
+ membuf_store(&to, (u32)(regs->y));
+ return membuf_zero(&to, 2 * sizeof(u32));
+}
+
+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];
+ reg_window -= 16;
+ if (target == current) {
+ for (; count > 0 && pos < 32; count--) {
+ if (put_user(*k++, &reg_window[pos++]))
+ return -EFAULT;
+ }
+ } else {
+ for (; count > 0 && pos < 32; count--) {
+ if (access_process_vm(target,
+ (unsigned long)
+ &reg_window[pos],
+ (void *) k,
+ sizeof(*k),
+ FOLL_FORCE | FOLL_WRITE)
+ != sizeof(*k))
+ return -EFAULT;
+ k++;
+ pos++;
+ }
+ }
+ } 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];
+ reg_window -= 16;
+ if (target == current) {
+ for (; count > 0 && pos < 32; count--) {
+ if (get_user(reg, u++) ||
+ put_user(reg, &reg_window[pos++]))
+ return -EFAULT;
+ }
+ } else {
+ for (; count > 0 && pos < 32; count--) {
+ if (get_user(reg, u++))
+ return -EFAULT;
+ if (access_process_vm(target,
+ (unsigned long)
+ &reg_window[pos],
+ &reg, sizeof(reg),
+ FOLL_FORCE | FOLL_WRITE)
+ != sizeof(reg))
+ return -EFAULT;
+ pos++;
+ u++;
+ }
+ }
+ }
+ 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_SYSCALL);
+ tstate |= psr_to_tstate_icc(reg);
+ if (reg & PSR_SYSCALL)
+ tstate |= TSTATE_SYSCALL;
+ 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,
+ struct membuf to)
+{
+ struct thread_info *t = task_thread_info(target);
+ bool enabled;
+
+ if (target == current)
+ save_and_clear_fpu();
+
+ enabled = t->fpsaved[0] & FPRS_FEF;
+
+ membuf_write(&to, t->fpregs, 32 * sizeof(u32));
+ membuf_zero(&to, sizeof(u32));
+ if (enabled)
+ membuf_store(&to, (u32)t->xfsr[0]);
+ else
+ membuf_zero(&to, sizeof(u32));
+ membuf_store(&to, (u32)((enabled << 8) | (8 << 16)));
+ return membuf_zero(&to, 64 * sizeof(u32));
+}
+
+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,
+ .size = sizeof(u32), .align = sizeof(u32),
+ .regset_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,
+ .size = sizeof(u32), .align = sizeof(u32),
+ .regset_get = fpregs32_get, .set = fpregs32_set
+ },
+};
+
+static int getregs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ const struct pt_regs *regs = task_pt_regs(target);
+ int i;
+
+ if (target == current)
+ flushw_user();
+
+ membuf_store(&to, (u32)tstate_to_psr(regs->tstate));
+ membuf_store(&to, (u32)(regs->tpc));
+ membuf_store(&to, (u32)(regs->tnpc));
+ membuf_store(&to, (u32)(regs->y));
+ for (i = 1; i < 16; i++)
+ membuf_store(&to, (u32)regs->u_regs[i]);
+ return to.left;
+}
+
+static int setregs_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);
+ unsigned long tstate;
+ u32 uregs[19];
+ int i, ret;
+
+ if (target == current)
+ flushw_user();
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ uregs,
+ 0, 19 * sizeof(u32));
+ if (ret)
+ return ret;
+
+ tstate = regs->tstate;
+ tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
+ tstate |= psr_to_tstate_icc(uregs[0]);
+ if (uregs[0] & PSR_SYSCALL)
+ tstate |= TSTATE_SYSCALL;
+ regs->tstate = tstate;
+ regs->tpc = uregs[1];
+ regs->tnpc = uregs[2];
+ regs->y = uregs[3];
+
+ for (i = 1; i < 15; i++)
+ regs->u_regs[i] = uregs[3 + i];
+ return 0;
+}
+
+static int getfpregs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ struct thread_info *t = task_thread_info(target);
+
+ if (target == current)
+ save_and_clear_fpu();
+
+ membuf_write(&to, t->fpregs, 32 * sizeof(u32));
+ if (t->fpsaved[0] & FPRS_FEF)
+ membuf_store(&to, (u32)t->xfsr[0]);
+ else
+ membuf_zero(&to, sizeof(u32));
+ return membuf_zero(&to, 35 * sizeof(u32));
+}
+
+static int setfpregs_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) {
+ compat_ulong_t fsr;
+ unsigned long val;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &fsr,
+ 32 * sizeof(u32),
+ 33 * 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;
+ return ret;
+}
+
+static const struct user_regset ptrace32_regsets[] = {
+ [REGSET_GENERAL] = {
+ .n = 19, .size = sizeof(u32),
+ .regset_get = getregs_get, .set = setregs_set,
+ },
+ [REGSET_FP] = {
+ .n = 68, .size = sizeof(u32),
+ .regset_get = getfpregs_get, .set = setfpregs_set,
+ },
+};
+
+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)
+};
+#endif /* CONFIG_COMPAT */
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+#ifdef CONFIG_COMPAT
+ if (test_tsk_thread_flag(task, TIF_32BIT))
+ return &user_sparc32_view;
+#endif
+ return &user_sparc64_view;
+}
+
+#ifdef CONFIG_COMPAT
+struct compat_fps {
+ unsigned int regs[32];
+ unsigned int fsr;
+ unsigned int flags;
+ unsigned int extra;
+ unsigned int fpqd;
+ struct compat_fq {
+ unsigned int insnaddr;
+ unsigned int insn;
+ } fpq[16];
+};
+
+long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
+ compat_ulong_t caddr, compat_ulong_t cdata)
+{
+ compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
+ struct pt_regs32 __user *pregs;
+ struct compat_fps __user *fps;
+ unsigned long addr2 = caddr2;
+ unsigned long addr = caddr;
+ unsigned long data = cdata;
+ int ret;
+
+ pregs = (struct pt_regs32 __user *) addr;
+ fps = (struct compat_fps __user *) addr;
+
+ switch (request) {
+ case PTRACE_PEEKUSR:
+ ret = (addr != 0) ? -EIO : 0;
+ break;
+
+ case PTRACE_GETREGS:
+ ret = copy_regset_to_user(child, &ptrace32_view,
+ REGSET_GENERAL, 0,
+ 19 * sizeof(u32),
+ pregs);
+ break;
+
+ case PTRACE_SETREGS:
+ ret = copy_regset_from_user(child, &ptrace32_view,
+ REGSET_GENERAL, 0,
+ 19 * sizeof(u32),
+ pregs);
+ break;
+
+ case PTRACE_GETFPREGS:
+ ret = copy_regset_to_user(child, &ptrace32_view,
+ REGSET_FP, 0,
+ 68 * sizeof(u32),
+ fps);
+ break;
+
+ case PTRACE_SETFPREGS:
+ ret = copy_regset_from_user(child, &ptrace32_view,
+ REGSET_FP, 0,
+ 33 * sizeof(u32),
+ fps);
+ break;
+
+ case PTRACE_READTEXT:
+ case PTRACE_READDATA:
+ ret = ptrace_readdata(child, addr,
+ (char __user *)addr2, data);
+ if (ret == data)
+ ret = 0;
+ else if (ret >= 0)
+ ret = -EIO;
+ break;
+
+ case PTRACE_WRITETEXT:
+ case PTRACE_WRITEDATA:
+ ret = ptrace_writedata(child, (char __user *) addr2,
+ addr, data);
+ if (ret == data)
+ ret = 0;
+ else if (ret >= 0)
+ ret = -EIO;
+ break;
+
+ default:
+ if (request == PTRACE_SPARC_DETACH)
+ request = PTRACE_DETACH;
+ ret = compat_ptrace_request(child, request, addr, data);
+ break;
+ }
+
+ return ret;
+}
+#endif /* CONFIG_COMPAT */
+
+struct fps {
+ unsigned int regs[64];
+ unsigned long fsr;
+};
+
+long arch_ptrace(struct task_struct *child, long request,
+ unsigned long addr, unsigned long data)
+{
+ const struct user_regset_view *view = task_user_regset_view(current);
+ unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
+ struct pt_regs __user *pregs;
+ struct fps __user *fps;
+ void __user *addr2p;
+ int ret;
+
+ pregs = (struct pt_regs __user *) addr;
+ fps = (struct fps __user *) addr;
+ addr2p = (void __user *) addr2;
+
+ switch (request) {
+ case PTRACE_PEEKUSR:
+ ret = (addr != 0) ? -EIO : 0;
+ break;
+
+ case PTRACE_GETREGS64:
+ ret = copy_regset_to_user(child, &ptrace64_view,
+ REGSET_GENERAL, 0,
+ 19 * sizeof(u64),
+ pregs);
+ break;
+
+ case PTRACE_SETREGS64:
+ ret = copy_regset_from_user(child, &ptrace64_view,
+ REGSET_GENERAL, 0,
+ 19 * sizeof(u64),
+ pregs);
+ break;
+
+ case PTRACE_GETFPREGS64:
+ ret = copy_regset_to_user(child, view, REGSET_FP,
+ 0 * sizeof(u64),
+ 33 * sizeof(u64),
+ fps);
+ break;
+
+ case PTRACE_SETFPREGS64:
+ ret = copy_regset_from_user(child, view, REGSET_FP,
+ 0 * sizeof(u64),
+ 33 * sizeof(u64),
+ fps);
+ break;
+
+ case PTRACE_READTEXT:
+ case PTRACE_READDATA:
+ ret = ptrace_readdata(child, addr, addr2p, data);
+ if (ret == data)
+ ret = 0;
+ else if (ret >= 0)
+ ret = -EIO;
+ break;
+
+ case PTRACE_WRITETEXT:
+ case PTRACE_WRITEDATA:
+ ret = ptrace_writedata(child, addr2p, addr, data);
+ if (ret == data)
+ ret = 0;
+ else if (ret >= 0)
+ ret = -EIO;
+ break;
+
+ default:
+ if (request == PTRACE_SPARC_DETACH)
+ request = PTRACE_DETACH;
+ ret = ptrace_request(child, request, addr, data);
+ break;
+ }
+
+ return ret;
+}
+
+asmlinkage int syscall_trace_enter(struct pt_regs *regs)
+{
+ int ret = 0;
+
+ /* do the secure computing check first */
+ secure_computing_strict(regs->u_regs[UREG_G1]);
+
+ if (test_thread_flag(TIF_NOHZ))
+ user_exit();
+
+ if (test_thread_flag(TIF_SYSCALL_TRACE))
+ ret = tracehook_report_syscall_entry(regs);
+
+ if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
+ trace_sys_enter(regs, regs->u_regs[UREG_G1]);
+
+ audit_syscall_entry(regs->u_regs[UREG_G1], regs->u_regs[UREG_I0],
+ regs->u_regs[UREG_I1], regs->u_regs[UREG_I2],
+ regs->u_regs[UREG_I3]);
+
+ return ret;
+}
+
+asmlinkage void syscall_trace_leave(struct pt_regs *regs)
+{
+ if (test_thread_flag(TIF_NOHZ))
+ user_exit();
+
+ audit_syscall_exit(regs);
+
+ if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
+ trace_sys_exit(regs, regs->u_regs[UREG_I0]);
+
+ if (test_thread_flag(TIF_SYSCALL_TRACE))
+ tracehook_report_syscall_exit(regs, 0);
+
+ if (test_thread_flag(TIF_NOHZ))
+ user_enter();
+}
+
+/**
+ * regs_query_register_offset() - query register offset from its name
+ * @name: the name of a register
+ *
+ * regs_query_register_offset() returns the offset of a register in struct
+ * pt_regs from its name. If the name is invalid, this returns -EINVAL;
+ */
+int regs_query_register_offset(const char *name)
+{
+ const struct pt_regs_offset *roff;
+
+ for (roff = regoffset_table; roff->name != NULL; roff++)
+ if (!strcmp(roff->name, name))
+ return roff->offset;
+ return -EINVAL;
+}
+
+/**
+ * regs_within_kernel_stack() - check the address in the stack
+ * @regs: pt_regs which contains kernel stack pointer.
+ * @addr: address which is checked.
+ *
+ * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
+ * If @addr is within the kernel stack, it returns true. If not, returns false.
+ */
+static inline int regs_within_kernel_stack(struct pt_regs *regs,
+ unsigned long addr)
+{
+ unsigned long ksp = kernel_stack_pointer(regs) + STACK_BIAS;
+ return ((addr & ~(THREAD_SIZE - 1)) ==
+ (ksp & ~(THREAD_SIZE - 1)));
+}
+
+/**
+ * regs_get_kernel_stack_nth() - get Nth entry of the stack
+ * @regs: pt_regs which contains kernel stack pointer.
+ * @n: stack entry number.
+ *
+ * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
+ * is specified by @regs. If the @n th entry is NOT in the kernel stack,
+ * this returns 0.
+ */
+unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
+{
+ unsigned long ksp = kernel_stack_pointer(regs) + STACK_BIAS;
+ unsigned long *addr = (unsigned long *)ksp;
+ addr += n;
+ if (regs_within_kernel_stack(regs, (unsigned long)addr))
+ return *addr;
+ else
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 02:00:02 +0000