ARC: ptrace support
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/arc/kernel/ptrace.c b/arch/arc/kernel/ptrace.c
index 1cf944a..c6a81c5 100644
--- a/arch/arc/kernel/ptrace.c
+++ b/arch/arc/kernel/ptrace.c
@@ -7,6 +7,122 @@
*/
#include <linux/ptrace.h>
+#include <linux/tracehook.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);
+
+ REG_O_CHUNK(scratch, callee, ptregs);
+ REG_O_CHUNK(callee, efa, cregs);
+ REG_O_CHUNK(efa, stop_pc, &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);
+
+ /* TBD: disallow updates to STATUS32, orig_r8 etc*/
+ REG_IN_CHUNK(scratch, callee, ptregs); /* pt_regs[bta..orig_r8] */
+ REG_IN_CHUNK(callee, efa, cregs); /* callee_regs[r25..r13] */
+ REG_IGNORE_ONE(efa); /* efa update invalid */
+ REG_IN_ONE(stop_pc, &ptregs->ret); /* stop_pc: PC update */
+
+ return ret;
+}
+
+enum arc_getset {
+ REGSET_GENERAL,
+};
+
+static const struct user_regset arc_regsets[] = {
+ [REGSET_GENERAL] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = ELF_NGREG,
+ .size = sizeof(unsigned long),
+ .align = sizeof(unsigned long),
+ .get = genregs_get,
+ .set = genregs_set,
+ }
+};
+
+static const struct user_regset_view user_arc_view = {
+ .name = UTS_MACHINE,
+ .e_machine = EM_ARCOMPACT,
+ .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)
{
@@ -16,11 +132,27 @@
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) {
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ break;
+ }
+
return ret;
}
-
-const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+asmlinkage int syscall_trace_entry(struct pt_regs *regs)
{
- return (const struct user_regset_view *)NULL;
+ 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);
}