arm64: cpuinfo: add system serial support

[firefly-linux-kernel-4.4.55.git] / arch / arm64 / kernel / ptrace.c

diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index fc779ec6f051fcacf52c793f37961a75db832fab..c5ef059598135eee7ee8894330e269d1d2b1bec2 100644 (file)
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -49,6 +49,106 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/syscalls.h>
 
+struct pt_regs_offset {
+       const char *name;
+       int offset;
+};
+
+#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
+#define REG_OFFSET_END {.name = NULL, .offset = 0}
+#define GPR_OFFSET_NAME(r) \
+       {.name = "x" #r, .offset = offsetof(struct pt_regs, regs[r])}
+
+static const struct pt_regs_offset regoffset_table[] = {
+       GPR_OFFSET_NAME(0),
+       GPR_OFFSET_NAME(1),
+       GPR_OFFSET_NAME(2),
+       GPR_OFFSET_NAME(3),
+       GPR_OFFSET_NAME(4),
+       GPR_OFFSET_NAME(5),
+       GPR_OFFSET_NAME(6),
+       GPR_OFFSET_NAME(7),
+       GPR_OFFSET_NAME(8),
+       GPR_OFFSET_NAME(9),
+       GPR_OFFSET_NAME(10),
+       GPR_OFFSET_NAME(11),
+       GPR_OFFSET_NAME(12),
+       GPR_OFFSET_NAME(13),
+       GPR_OFFSET_NAME(14),
+       GPR_OFFSET_NAME(15),
+       GPR_OFFSET_NAME(16),
+       GPR_OFFSET_NAME(17),
+       GPR_OFFSET_NAME(18),
+       GPR_OFFSET_NAME(19),
+       GPR_OFFSET_NAME(20),
+       GPR_OFFSET_NAME(21),
+       GPR_OFFSET_NAME(22),
+       GPR_OFFSET_NAME(23),
+       GPR_OFFSET_NAME(24),
+       GPR_OFFSET_NAME(25),
+       GPR_OFFSET_NAME(26),
+       GPR_OFFSET_NAME(27),
+       GPR_OFFSET_NAME(28),
+       GPR_OFFSET_NAME(29),
+       GPR_OFFSET_NAME(30),
+       {.name = "lr", .offset = offsetof(struct pt_regs, regs[30])},
+       REG_OFFSET_NAME(sp),
+       REG_OFFSET_NAME(pc),
+       REG_OFFSET_NAME(pstate),
+       REG_OFFSET_END,
+};
+
+/**
+ * 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 bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
+{
+       return ((addr & ~(THREAD_SIZE - 1))  ==
+               (kernel_stack_pointer(regs) & ~(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 *addr = (unsigned long *)kernel_stack_pointer(regs);
+
+       addr += n;
+       if (regs_within_kernel_stack(regs, (unsigned long)addr))
+               return *addr;
+       else
+               return 0;
+}
+
 /*
  * TODO: does not yet catch signals sent when the child dies.
  * in exit.c or in signal.c.
@@ -450,6 +550,8 @@ static int hw_break_set(struct task_struct *target,
        /* (address, ctrl) registers */
        limit = regset->n * regset->size;
        while (count && offset < limit) {
+               if (count < PTRACE_HBP_ADDR_SZ)
+                       return -EINVAL;
                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &addr,
                                         offset, offset + PTRACE_HBP_ADDR_SZ);
                if (ret)
@@ -459,6 +561,8 @@ static int hw_break_set(struct task_struct *target,
                        return ret;
                offset += PTRACE_HBP_ADDR_SZ;
 
+               if (!count)
+                       break;
                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl,
                                         offset, offset + PTRACE_HBP_CTRL_SZ);
                if (ret)
@@ -495,7 +599,7 @@ static int gpr_set(struct task_struct *target, const struct user_regset *regset,
                   const void *kbuf, const void __user *ubuf)
 {
        int ret;
-       struct user_pt_regs newregs;
+       struct user_pt_regs newregs = task_pt_regs(target)->user_regs;
 
        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
        if (ret)
@@ -525,7 +629,8 @@ static int fpr_set(struct task_struct *target, const struct user_regset *regset,
                   const void *kbuf, const void __user *ubuf)
 {
        int ret;
-       struct user_fpsimd_state newstate;
+       struct user_fpsimd_state newstate =
+               target->thread.fpsimd_state.user_fpsimd;
 
        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate, 0, -1);
        if (ret)
@@ -549,7 +654,7 @@ static int tls_set(struct task_struct *target, const struct user_regset *regset,
                   const void *kbuf, const void __user *ubuf)
 {
        int ret;
-       unsigned long tls;
+       unsigned long tls = target->thread.tp_value;
 
        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
        if (ret)
@@ -575,7 +680,8 @@ static int system_call_set(struct task_struct *target,
                           unsigned int pos, unsigned int count,
                           const void *kbuf, const void __user *ubuf)
 {
-       int syscallno, ret;
+       int syscallno = task_pt_regs(target)->syscallno;
+       int ret;
 
        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &syscallno, 0, -1);
        if (ret)
@@ -847,7 +953,7 @@ static int compat_tls_set(struct task_struct *target,
                          const void __user *ubuf)
 {
        int ret;
-       compat_ulong_t tls;
+       compat_ulong_t tls = target->thread.tp_value;
 
        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
        if (ret)