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-rw-r--r--arch/arc/kernel/ptrace.c305
1 files changed, 305 insertions, 0 deletions
diff --git a/arch/arc/kernel/ptrace.c b/arch/arc/kernel/ptrace.c
new file mode 100644
index 000000000..5ee4676f1
--- /dev/null
+++ b/arch/arc/kernel/ptrace.c
@@ -0,0 +1,305 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/ptrace.h>
+#include <linux/tracehook.h>
+#include <linux/sched/task_stack.h>
+#include <linux/regset.h>
+#include <linux/unistd.h>
+#include <linux/elf.h>
+
+static struct callee_regs *task_callee_regs(struct task_struct *tsk)
+{
+ struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg;
+ return tmp;
+}
+
+static int genregs_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 *ptregs = task_pt_regs(target);
+ const struct callee_regs *cregs = task_callee_regs(target);
+ int ret = 0;
+ unsigned int stop_pc_val;
+
+#define REG_O_CHUNK(START, END, PTR) \
+ if (!ret) \
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
+ offsetof(struct user_regs_struct, START), \
+ offsetof(struct user_regs_struct, END));
+
+#define REG_O_ONE(LOC, PTR) \
+ if (!ret) \
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
+ offsetof(struct user_regs_struct, LOC), \
+ offsetof(struct user_regs_struct, LOC) + 4);
+
+#define REG_O_ZERO(LOC) \
+ if (!ret) \
+ ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \
+ offsetof(struct user_regs_struct, LOC), \
+ offsetof(struct user_regs_struct, LOC) + 4);
+
+ REG_O_ZERO(pad);
+ REG_O_ONE(scratch.bta, &ptregs->bta);
+ REG_O_ONE(scratch.lp_start, &ptregs->lp_start);
+ REG_O_ONE(scratch.lp_end, &ptregs->lp_end);
+ REG_O_ONE(scratch.lp_count, &ptregs->lp_count);
+ REG_O_ONE(scratch.status32, &ptregs->status32);
+ REG_O_ONE(scratch.ret, &ptregs->ret);
+ REG_O_ONE(scratch.blink, &ptregs->blink);
+ REG_O_ONE(scratch.fp, &ptregs->fp);
+ REG_O_ONE(scratch.gp, &ptregs->r26);
+ REG_O_ONE(scratch.r12, &ptregs->r12);
+ REG_O_ONE(scratch.r11, &ptregs->r11);
+ REG_O_ONE(scratch.r10, &ptregs->r10);
+ REG_O_ONE(scratch.r9, &ptregs->r9);
+ REG_O_ONE(scratch.r8, &ptregs->r8);
+ REG_O_ONE(scratch.r7, &ptregs->r7);
+ REG_O_ONE(scratch.r6, &ptregs->r6);
+ REG_O_ONE(scratch.r5, &ptregs->r5);
+ REG_O_ONE(scratch.r4, &ptregs->r4);
+ REG_O_ONE(scratch.r3, &ptregs->r3);
+ REG_O_ONE(scratch.r2, &ptregs->r2);
+ REG_O_ONE(scratch.r1, &ptregs->r1);
+ REG_O_ONE(scratch.r0, &ptregs->r0);
+ REG_O_ONE(scratch.sp, &ptregs->sp);
+
+ REG_O_ZERO(pad2);
+
+ REG_O_ONE(callee.r25, &cregs->r25);
+ REG_O_ONE(callee.r24, &cregs->r24);
+ REG_O_ONE(callee.r23, &cregs->r23);
+ REG_O_ONE(callee.r22, &cregs->r22);
+ REG_O_ONE(callee.r21, &cregs->r21);
+ REG_O_ONE(callee.r20, &cregs->r20);
+ REG_O_ONE(callee.r19, &cregs->r19);
+ REG_O_ONE(callee.r18, &cregs->r18);
+ REG_O_ONE(callee.r17, &cregs->r17);
+ REG_O_ONE(callee.r16, &cregs->r16);
+ REG_O_ONE(callee.r15, &cregs->r15);
+ REG_O_ONE(callee.r14, &cregs->r14);
+ REG_O_ONE(callee.r13, &cregs->r13);
+
+ REG_O_ONE(efa, &target->thread.fault_address);
+
+ if (!ret) {
+ if (in_brkpt_trap(ptregs)) {
+ stop_pc_val = target->thread.fault_address;
+ pr_debug("\t\tstop_pc (brk-pt)\n");
+ } else {
+ stop_pc_val = ptregs->ret;
+ pr_debug("\t\tstop_pc (others)\n");
+ }
+
+ REG_O_ONE(stop_pc, &stop_pc_val);
+ }
+
+ return ret;
+}
+
+static int genregs_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ const struct pt_regs *ptregs = task_pt_regs(target);
+ const struct callee_regs *cregs = task_callee_regs(target);
+ int ret = 0;
+
+#define REG_IN_CHUNK(FIRST, NEXT, PTR) \
+ if (!ret) \
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
+ (void *)(PTR), \
+ offsetof(struct user_regs_struct, FIRST), \
+ offsetof(struct user_regs_struct, NEXT));
+
+#define REG_IN_ONE(LOC, PTR) \
+ if (!ret) \
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
+ (void *)(PTR), \
+ offsetof(struct user_regs_struct, LOC), \
+ offsetof(struct user_regs_struct, LOC) + 4);
+
+#define REG_IGNORE_ONE(LOC) \
+ if (!ret) \
+ ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
+ offsetof(struct user_regs_struct, LOC), \
+ offsetof(struct user_regs_struct, LOC) + 4);
+
+ REG_IGNORE_ONE(pad);
+
+ REG_IN_ONE(scratch.bta, &ptregs->bta);
+ REG_IN_ONE(scratch.lp_start, &ptregs->lp_start);
+ REG_IN_ONE(scratch.lp_end, &ptregs->lp_end);
+ REG_IN_ONE(scratch.lp_count, &ptregs->lp_count);
+
+ REG_IGNORE_ONE(scratch.status32);
+
+ REG_IN_ONE(scratch.ret, &ptregs->ret);
+ REG_IN_ONE(scratch.blink, &ptregs->blink);
+ REG_IN_ONE(scratch.fp, &ptregs->fp);
+ REG_IN_ONE(scratch.gp, &ptregs->r26);
+ REG_IN_ONE(scratch.r12, &ptregs->r12);
+ REG_IN_ONE(scratch.r11, &ptregs->r11);
+ REG_IN_ONE(scratch.r10, &ptregs->r10);
+ REG_IN_ONE(scratch.r9, &ptregs->r9);
+ REG_IN_ONE(scratch.r8, &ptregs->r8);
+ REG_IN_ONE(scratch.r7, &ptregs->r7);
+ REG_IN_ONE(scratch.r6, &ptregs->r6);
+ REG_IN_ONE(scratch.r5, &ptregs->r5);
+ REG_IN_ONE(scratch.r4, &ptregs->r4);
+ REG_IN_ONE(scratch.r3, &ptregs->r3);
+ REG_IN_ONE(scratch.r2, &ptregs->r2);
+ REG_IN_ONE(scratch.r1, &ptregs->r1);
+ REG_IN_ONE(scratch.r0, &ptregs->r0);
+ REG_IN_ONE(scratch.sp, &ptregs->sp);
+
+ REG_IGNORE_ONE(pad2);
+
+ REG_IN_ONE(callee.r25, &cregs->r25);
+ REG_IN_ONE(callee.r24, &cregs->r24);
+ REG_IN_ONE(callee.r23, &cregs->r23);
+ REG_IN_ONE(callee.r22, &cregs->r22);
+ REG_IN_ONE(callee.r21, &cregs->r21);
+ REG_IN_ONE(callee.r20, &cregs->r20);
+ REG_IN_ONE(callee.r19, &cregs->r19);
+ REG_IN_ONE(callee.r18, &cregs->r18);
+ REG_IN_ONE(callee.r17, &cregs->r17);
+ REG_IN_ONE(callee.r16, &cregs->r16);
+ REG_IN_ONE(callee.r15, &cregs->r15);
+ REG_IN_ONE(callee.r14, &cregs->r14);
+ REG_IN_ONE(callee.r13, &cregs->r13);
+
+ REG_IGNORE_ONE(efa); /* efa update invalid */
+ REG_IGNORE_ONE(stop_pc); /* PC updated via @ret */
+
+ return ret;
+}
+
+#ifdef CONFIG_ISA_ARCV2
+static int arcv2regs_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, copy_sz;
+
+ if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS))
+ copy_sz = sizeof(struct user_regs_arcv2);
+ else
+ copy_sz = 4; /* r30 only */
+
+ /*
+ * itemized copy not needed like above as layout of regs (r30,r58,r59)
+ * is exactly same in kernel (pt_regs) and userspace (user_regs_arcv2)
+ */
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &regs->r30,
+ 0, copy_sz);
+
+ return ret;
+}
+
+static int arcv2regs_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ const struct pt_regs *regs = task_pt_regs(target);
+ int ret, copy_sz;
+
+ if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS))
+ copy_sz = sizeof(struct user_regs_arcv2);
+ else
+ copy_sz = 4; /* r30 only */
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, (void *)&regs->r30,
+ 0, copy_sz);
+
+ return ret;
+}
+
+#endif
+
+enum arc_getset {
+ REGSET_CMN,
+ REGSET_ARCV2,
+};
+
+static const struct user_regset arc_regsets[] = {
+ [REGSET_CMN] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = ELF_NGREG,
+ .size = sizeof(unsigned long),
+ .align = sizeof(unsigned long),
+ .get = genregs_get,
+ .set = genregs_set,
+ },
+#ifdef CONFIG_ISA_ARCV2
+ [REGSET_ARCV2] = {
+ .core_note_type = NT_ARC_V2,
+ .n = ELF_ARCV2REG,
+ .size = sizeof(unsigned long),
+ .align = sizeof(unsigned long),
+ .get = arcv2regs_get,
+ .set = arcv2regs_set,
+ },
+#endif
+};
+
+static const struct user_regset_view user_arc_view = {
+ .name = UTS_MACHINE,
+ .e_machine = EM_ARC_INUSE,
+ .regsets = arc_regsets,
+ .n = ARRAY_SIZE(arc_regsets)
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+ return &user_arc_view;
+}
+
+void ptrace_disable(struct task_struct *child)
+{
+}
+
+long arch_ptrace(struct task_struct *child, long request,
+ unsigned long addr, unsigned long data)
+{
+ int ret = -EIO;
+
+ pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data);
+
+ switch (request) {
+ case PTRACE_GET_THREAD_AREA:
+ ret = put_user(task_thread_info(child)->thr_ptr,
+ (unsigned long __user *)data);
+ break;
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ break;
+ }
+
+ return ret;
+}
+
+asmlinkage int syscall_trace_entry(struct pt_regs *regs)
+{
+ if (tracehook_report_syscall_entry(regs))
+ return ULONG_MAX;
+
+ return regs->r8;
+}
+
+asmlinkage void syscall_trace_exit(struct pt_regs *regs)
+{
+ tracehook_report_syscall_exit(regs, 0);
+}
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