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authorVineet Gupta <vgupta@synopsys.com>2017-05-03 11:21:31 -0700
committerVineet Gupta <vgupta@synopsys.com>2017-05-03 11:21:31 -0700
commit65c02a556bc4f374e9002ded1ea11a0263da7b63 (patch)
treee1fc9fb0759116f84380260fd73e74183f9673f8
parent991c7ed6acca506983c42d51965da8b8f3677682 (diff)
ARCv2: ptrace: provide regset for accumulator/r30 regs
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
-rw-r--r--arch/arc/include/uapi/asm/elf.h1
-rw-r--r--arch/arc/include/uapi/asm/ptrace.h5
-rw-r--r--arch/arc/kernel/ptrace.c62
3 files changed, 65 insertions, 3 deletions
diff --git a/arch/arc/include/uapi/asm/elf.h b/arch/arc/include/uapi/asm/elf.h
index 0037a587320d..06d95e611616 100644
--- a/arch/arc/include/uapi/asm/elf.h
+++ b/arch/arc/include/uapi/asm/elf.h
@@ -27,6 +27,7 @@ typedef unsigned long elf_greg_t;
typedef unsigned long elf_fpregset_t;
#define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t))
+#define ELF_ARCV2REG (sizeof(struct user_regs_arcv2) / sizeof(elf_greg_t))
typedef elf_greg_t elf_gregset_t[ELF_NGREG];
diff --git a/arch/arc/include/uapi/asm/ptrace.h b/arch/arc/include/uapi/asm/ptrace.h
index 0b3ef63d4a03..dd206e6b482c 100644
--- a/arch/arc/include/uapi/asm/ptrace.h
+++ b/arch/arc/include/uapi/asm/ptrace.h
@@ -47,6 +47,11 @@ struct user_regs_struct {
unsigned long efa; /* break pt addr, for break points in delay slots */
unsigned long stop_pc; /* give dbg stop_pc after ensuring brkpt trap */
};
+
+struct user_regs_arcv2 {
+ unsigned long r30, r58, r59;
+};
+
#endif /* !__ASSEMBLY__ */
#endif /* _UAPI__ASM_ARC_PTRACE_H */
diff --git a/arch/arc/kernel/ptrace.c b/arch/arc/kernel/ptrace.c
index 31150060d38b..5ee4676f135d 100644
--- a/arch/arc/kernel/ptrace.c
+++ b/arch/arc/kernel/ptrace.c
@@ -184,19 +184,75 @@ static int genregs_set(struct task_struct *target,
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_GENERAL,
+ REGSET_CMN,
+ REGSET_ARCV2,
};
static const struct user_regset arc_regsets[] = {
- [REGSET_GENERAL] = {
+ [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 = {