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parisc: add CALLER_ADDR{0-6} macros 

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
This commit is contained in:
Helge Deller 2009-10-25 21:48:36 +00:00 committed by Kyle McMartin
parent b29f90379e
commit 11e178091f
2 changed files with 41 additions and 0 deletions
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14
arch/parisc/include/asm/ftrace.h
View File

@ -20,6 +20,20 @@ struct ftrace_ret_stack {
* Defined in entry.S
*/
extern void return_to_handler(void);
extern unsigned long return_address(unsigned int);
#define HAVE_ARCH_CALLER_ADDR
#define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
#define CALLER_ADDR1 return_address(1)
#define CALLER_ADDR2 return_address(2)
#define CALLER_ADDR3 return_address(3)
#define CALLER_ADDR4 return_address(4)
#define CALLER_ADDR5 return_address(5)
#define CALLER_ADDR6 return_address(6)
#endif /* __ASSEMBLY__ */
#endif /* _ASM_PARISC_FTRACE_H */

27
arch/parisc/kernel/unwind.c
View File

@ -417,3 +417,30 @@ int unwind_to_user(struct unwind_frame_info *info)
return ret;
}
unsigned long return_address(unsigned int level)
{
struct unwind_frame_info info;
struct pt_regs r;
unsigned long sp;
/* initialize unwind info */
asm volatile ("copy %%r30, %0" : "=r"(sp));
memset(&r, 0, sizeof(struct pt_regs));
r.iaoq[0] = (unsigned long) current_text_addr();
r.gr[2] = (unsigned long) __builtin_return_address(0);
r.gr[30] = sp;
unwind_frame_init(&info, current, &r);
/* unwind stack */
++level;
do {
if (unwind_once(&info) < 0 || info.ip == 0)
return 0;
if (!__kernel_text_address(info.ip)) {
return 0;
}
} while (info.ip && level--);
return info.ip;
}