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parisc: Add HAVE_REGS_AND_STACK_ACCESS_API feature

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Some parts of the HAVE_REGS_AND_STACK_ACCESS_API feature is needed for
the rseq syscall. This patch adds the most important parts, and as long
as we don't support kprobes, we should be fine.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2018-06-28 22:47:11 +02:00
parent 93cb8e20d5
commit 75ebedf1d2
3 changed files with 112 additions and 0 deletions
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1
arch/parisc/Kconfig
View File

@ -45,6 +45,7 @@ config PARISC
select HAVE_ARCH_HASH
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_TRACEHOOK
select HAVE_REGS_AND_STACK_ACCESS_API
select GENERIC_SCHED_CLOCK
select HAVE_UNSTABLE_SCHED_CLOCK if SMP
select GENERIC_CLOCKEVENTS

11
arch/parisc/include/asm/ptrace.h
View File

@ -25,4 +25,15 @@ static inline unsigned long regs_return_value(struct pt_regs *regs)
return regs->gr[20];
}
static inline void instruction_pointer_set(struct pt_regs *regs,
unsigned long val)
{
regs->iaoq[0] = val;
}
/* Query offset/name of register from its name/offset */
extern int regs_query_register_offset(const char *name);
extern const char *regs_query_register_name(unsigned int offset);
#define MAX_REG_OFFSET (offsetof(struct pt_regs, ipsw))
#endif

100
arch/parisc/kernel/ptrace.c
View File

@ -676,3 +676,103 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *task)
#endif
return &user_parisc_native_view;
}
/* HAVE_REGS_AND_STACK_ACCESS_API feature */
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_INDEX(r,i) {.name = #r#i, .offset = offsetof(struct pt_regs, r[i])}
#define REG_OFFSET_END {.name = NULL, .offset = 0}
static const struct pt_regs_offset regoffset_table[] = {
REG_OFFSET_INDEX(gr,0),
REG_OFFSET_INDEX(gr,1),
REG_OFFSET_INDEX(gr,2),
REG_OFFSET_INDEX(gr,3),
REG_OFFSET_INDEX(gr,4),
REG_OFFSET_INDEX(gr,5),
REG_OFFSET_INDEX(gr,6),
REG_OFFSET_INDEX(gr,7),
REG_OFFSET_INDEX(gr,8),
REG_OFFSET_INDEX(gr,9),
REG_OFFSET_INDEX(gr,10),
REG_OFFSET_INDEX(gr,11),
REG_OFFSET_INDEX(gr,12),
REG_OFFSET_INDEX(gr,13),
REG_OFFSET_INDEX(gr,14),
REG_OFFSET_INDEX(gr,15),
REG_OFFSET_INDEX(gr,16),
REG_OFFSET_INDEX(gr,17),
REG_OFFSET_INDEX(gr,18),
REG_OFFSET_INDEX(gr,19),
REG_OFFSET_INDEX(gr,20),
REG_OFFSET_INDEX(gr,21),
REG_OFFSET_INDEX(gr,22),
REG_OFFSET_INDEX(gr,23),
REG_OFFSET_INDEX(gr,24),
REG_OFFSET_INDEX(gr,25),
REG_OFFSET_INDEX(gr,26),
REG_OFFSET_INDEX(gr,27),
REG_OFFSET_INDEX(gr,28),
REG_OFFSET_INDEX(gr,29),
REG_OFFSET_INDEX(gr,30),
REG_OFFSET_INDEX(gr,31),
REG_OFFSET_INDEX(sr,0),
REG_OFFSET_INDEX(sr,1),
REG_OFFSET_INDEX(sr,2),
REG_OFFSET_INDEX(sr,3),
REG_OFFSET_INDEX(sr,4),
REG_OFFSET_INDEX(sr,5),
REG_OFFSET_INDEX(sr,6),
REG_OFFSET_INDEX(sr,7),
REG_OFFSET_INDEX(iasq,0),
REG_OFFSET_INDEX(iasq,1),
REG_OFFSET_INDEX(iaoq,0),
REG_OFFSET_INDEX(iaoq,1),
REG_OFFSET_NAME(cr27),
REG_OFFSET_NAME(ksp),
REG_OFFSET_NAME(kpc),
REG_OFFSET_NAME(sar),
REG_OFFSET_NAME(iir),
REG_OFFSET_NAME(isr),
REG_OFFSET_NAME(ior),
REG_OFFSET_NAME(ipsw),
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_query_register_name() - query register name from its offset
* @offset: the offset of a register in struct pt_regs.
*
* regs_query_register_name() returns the name of a register from its
* offset in struct pt_regs. If the @offset is invalid, this returns NULL;
*/
const char *regs_query_register_name(unsigned int offset)
{
const struct pt_regs_offset *roff;
for (roff = regoffset_table; roff->name != NULL; roff++)
if (roff->offset == offset)
return roff->name;
return NULL;
}