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[PATCH] Add regs_return_value() helper

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Add the regs_return_value() macro to extract the return value in an
architecture agnostic manner, given the pt_regs.

Other architecture maintainers may want to add similar helpers.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ananth N Mavinakayanahalli 2006-10-02 02:17:31 -07:00 committed by Linus Torvalds
parent 412998cf6b
commit b3f827cb0f
5 changed files with 11 additions and 0 deletions
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3
include/asm-i386/ptrace.h
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@ -47,7 +47,10 @@ static inline int user_mode_vm(struct pt_regs *regs)
{
return ((regs->xcs & SEGMENT_RPL_MASK) | (regs->eflags & VM_MASK)) >= USER_RPL;
}
#define instruction_pointer(regs) ((regs)->eip)
#define regs_return_value(regs) ((regs)->eax)
extern unsigned long profile_pc(struct pt_regs *regs);
#endif /* __KERNEL__ */

3
include/asm-ia64/ptrace.h
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@ -241,6 +241,9 @@ struct switch_stack {
* the canonical representation by adding to instruction pointer.
*/
# define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri)
#define regs_return_value(regs) ((regs)->r8)
/* Conserve space in histogram by encoding slot bits in address
* bits 2 and 3 rather than bits 0 and 1.
*/

2
include/asm-powerpc/ptrace.h
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@ -73,6 +73,8 @@ struct pt_regs {
#ifndef __ASSEMBLY__
#define instruction_pointer(regs) ((regs)->nip)
#define regs_return_value(regs) ((regs)->gpr[3])
#ifdef CONFIG_SMP
extern unsigned long profile_pc(struct pt_regs *regs);
#else

1
include/asm-s390/ptrace.h
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@ -472,6 +472,7 @@ struct user_regs_struct
#define user_mode(regs) (((regs)->psw.mask & PSW_MASK_PSTATE) != 0)
#define instruction_pointer(regs) ((regs)->psw.addr & PSW_ADDR_INSN)
#define regs_return_value(regs)((regs)->gprs[2])
#define profile_pc(regs) instruction_pointer(regs)
extern void show_regs(struct pt_regs * regs);
#endif

2
include/asm-x86_64/ptrace.h
View File

@ -39,6 +39,8 @@ struct pt_regs {
#define user_mode(regs) (!!((regs)->cs & 3))
#define user_mode_vm(regs) user_mode(regs)
#define instruction_pointer(regs) ((regs)->rip)
#define regs_return_value(regs) ((regs)->rax)
extern unsigned long profile_pc(struct pt_regs *regs);
void signal_fault(struct pt_regs *regs, void __user *frame, char *where);