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-rw-r--r--arch/sparc/kernel/ptrace_32.c448
1 files changed, 448 insertions, 0 deletions
diff --git a/arch/sparc/kernel/ptrace_32.c b/arch/sparc/kernel/ptrace_32.c
new file mode 100644
index 000000000..c273ccebe
--- /dev/null
+++ b/arch/sparc/kernel/ptrace_32.c
@@ -0,0 +1,448 @@
+// SPDX-License-Identifier: GPL-2.0
+/* ptrace.c: Sparc process tracing support.
+ *
+ * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
+ *
+ * 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/mm.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/smp.h>
+#include <linux/security.h>
+#include <linux/signal.h>
+#include <linux/regset.h>
+#include <linux/elf.h>
+
+#include <linux/uaccess.h>
+#include <asm/cacheflush.h>
+
+#include "kernel.h"
+
+/* #define ALLOW_INIT_TRACING */
+
+/*
+ * 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 */
+}
+
+enum sparc_regset {
+ REGSET_GENERAL,
+ REGSET_FP,
+};
+
+static int regwindow32_get(struct task_struct *target,
+ const struct pt_regs *regs,
+ u32 *uregs)
+{
+ unsigned long reg_window = regs->u_regs[UREG_I6];
+ int size = 16 * sizeof(u32);
+
+ if (target == current) {
+ if (copy_from_user(uregs, (void __user *)reg_window, size))
+ return -EFAULT;
+ } else {
+ if (access_process_vm(target, reg_window, uregs, size,
+ FOLL_FORCE) != size)
+ return -EFAULT;
+ }
+ return 0;
+}
+
+static int regwindow32_set(struct task_struct *target,
+ const struct pt_regs *regs,
+ u32 *uregs)
+{
+ unsigned long reg_window = regs->u_regs[UREG_I6];
+ int size = 16 * sizeof(u32);
+
+ if (target == current) {
+ if (copy_to_user((void __user *)reg_window, uregs, size))
+ return -EFAULT;
+ } else {
+ if (access_process_vm(target, reg_window, uregs, size,
+ FOLL_FORCE | FOLL_WRITE) != size)
+ return -EFAULT;
+ }
+ return 0;
+}
+
+static int genregs32_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ const struct pt_regs *regs = target->thread.kregs;
+ u32 uregs[16];
+
+ if (target == current)
+ flush_user_windows();
+
+ membuf_write(&to, regs->u_regs, 16 * sizeof(u32));
+ if (!to.left)
+ return 0;
+ if (regwindow32_get(target, regs, uregs))
+ return -EFAULT;
+ membuf_write(&to, uregs, 16 * sizeof(u32));
+ membuf_store(&to, regs->psr);
+ membuf_store(&to, regs->pc);
+ membuf_store(&to, regs->npc);
+ membuf_store(&to, 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 = target->thread.kregs;
+ u32 uregs[16];
+ u32 psr;
+ int ret;
+
+ if (target == current)
+ flush_user_windows();
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ regs->u_regs,
+ 0, 16 * sizeof(u32));
+ if (ret || !count)
+ return ret;
+
+ if (regwindow32_get(target, regs, uregs))
+ return -EFAULT;
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ uregs,
+ 16 * sizeof(u32), 32 * sizeof(u32));
+ if (ret)
+ return ret;
+ if (regwindow32_set(target, regs, uregs))
+ return -EFAULT;
+ if (!count)
+ return 0;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &psr,
+ 32 * sizeof(u32), 33 * sizeof(u32));
+ if (ret)
+ return ret;
+ regs->psr = (regs->psr & ~(PSR_ICC | PSR_SYSCALL)) |
+ (psr & (PSR_ICC | PSR_SYSCALL));
+ if (!count)
+ return 0;
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &regs->pc,
+ 33 * sizeof(u32), 34 * sizeof(u32));
+ if (ret || !count)
+ return ret;
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &regs->npc,
+ 34 * sizeof(u32), 35 * sizeof(u32));
+ if (ret || !count)
+ return ret;
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &regs->y,
+ 35 * sizeof(u32), 36 * sizeof(u32));
+ if (ret || !count)
+ return ret;
+ user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 36 * sizeof(u32),
+ 38 * sizeof(u32));
+ return 0;
+}
+
+static int fpregs32_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+#if 0
+ if (target == current)
+ save_and_clear_fpu();
+#endif
+
+ membuf_write(&to, target->thread.float_regs, 32 * sizeof(u32));
+ membuf_zero(&to, sizeof(u32));
+ membuf_write(&to, &target->thread.fsr, sizeof(u32));
+ membuf_store(&to, (u32)((1 << 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 = 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)
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.fsr,
+ 33 * sizeof(u32),
+ 34 * sizeof(u32));
+ if (!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 = target->thread.kregs;
+
+ if (target == current)
+ flush_user_windows();
+
+ membuf_store(&to, regs->psr);
+ membuf_store(&to, regs->pc);
+ membuf_store(&to, regs->npc);
+ membuf_store(&to, regs->y);
+ return membuf_write(&to, regs->u_regs + 1, 15 * sizeof(u32));
+}
+
+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 = target->thread.kregs;
+ u32 v[4];
+ int ret;
+
+ if (target == current)
+ flush_user_windows();
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ v,
+ 0, 4 * sizeof(u32));
+ if (ret)
+ return ret;
+ regs->psr = (regs->psr & ~(PSR_ICC | PSR_SYSCALL)) |
+ (v[0] & (PSR_ICC | PSR_SYSCALL));
+ regs->pc = v[1];
+ regs->npc = v[2];
+ regs->y = v[3];
+ return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ regs->u_regs + 1,
+ 4 * sizeof(u32) , 19 * sizeof(u32));
+}
+
+static int getfpregs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+#if 0
+ if (target == current)
+ save_and_clear_fpu();
+#endif
+ membuf_write(&to, &target->thread.float_regs, 32 * sizeof(u32));
+ membuf_write(&to, &target->thread.fsr, 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 = 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)
+ return ret;
+ return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.fsr,
+ 32 * sizeof(u32),
+ 33 * sizeof(u32));
+}
+
+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)
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+ return &user_sparc32_view;
+}
+
+struct fps {
+ unsigned long regs[32];
+ unsigned long fsr;
+ unsigned long flags;
+ unsigned long extra;
+ unsigned long fpqd;
+ struct fq {
+ unsigned long *insnaddr;
+ unsigned long insn;
+ } fpq[16];
+};
+
+long arch_ptrace(struct task_struct *child, long request,
+ unsigned long addr, unsigned long data)
+{
+ unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4];
+ void __user *addr2p;
+ struct pt_regs __user *pregs;
+ struct fps __user *fps;
+ int ret;
+
+ addr2p = (void __user *) addr2;
+ pregs = (struct pt_regs __user *) addr;
+ fps = (struct fps __user *) addr;
+
+ switch(request) {
+ 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, 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(struct pt_regs *regs, int syscall_exit_p)
+{
+ int ret = 0;
+
+ if (test_thread_flag(TIF_SYSCALL_TRACE)) {
+ if (syscall_exit_p)
+ ptrace_report_syscall_exit(regs, 0);
+ else
+ ret = ptrace_report_syscall_entry(regs);
+ }
+
+ return ret;
+}
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