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ARCv2: ptrace: provide regset for accumulator/r30 regs 

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
hifive-unleashed-5.1
Vineet Gupta 2017-05-03 11:21:31 -07:00
parent 991c7ed6ac
commit 65c02a556b
3 changed files with 65 additions and 3 deletions
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1
arch/arc/include/uapi/asm/elf.h
View File

@ -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];

5
arch/arc/include/uapi/asm/ptrace.h
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@ -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 */

62
arch/arc/kernel/ptrace.c
View File

@ -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 = {