[PATCH] Add regs_return_value() helper
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>
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@ -47,7 +47,10 @@ static inline int user_mode_vm(struct pt_regs *regs)
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{
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return ((regs->xcs & SEGMENT_RPL_MASK) | (regs->eflags & VM_MASK)) >= USER_RPL;
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}
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#define instruction_pointer(regs) ((regs)->eip)
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#define regs_return_value(regs) ((regs)->eax)
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extern unsigned long profile_pc(struct pt_regs *regs);
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#endif /* __KERNEL__ */
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@ -241,6 +241,9 @@ struct switch_stack {
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* the canonical representation by adding to instruction pointer.
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*/
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# define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri)
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#define regs_return_value(regs) ((regs)->r8)
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/* Conserve space in histogram by encoding slot bits in address
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* bits 2 and 3 rather than bits 0 and 1.
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*/
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@ -73,6 +73,8 @@ struct pt_regs {
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#ifndef __ASSEMBLY__
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#define instruction_pointer(regs) ((regs)->nip)
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#define regs_return_value(regs) ((regs)->gpr[3])
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#ifdef CONFIG_SMP
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extern unsigned long profile_pc(struct pt_regs *regs);
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#else
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@ -472,6 +472,7 @@ struct user_regs_struct
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#define user_mode(regs) (((regs)->psw.mask & PSW_MASK_PSTATE) != 0)
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#define instruction_pointer(regs) ((regs)->psw.addr & PSW_ADDR_INSN)
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#define regs_return_value(regs)((regs)->gprs[2])
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#define profile_pc(regs) instruction_pointer(regs)
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extern void show_regs(struct pt_regs * regs);
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#endif
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@ -39,6 +39,8 @@ struct pt_regs {
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#define user_mode(regs) (!!((regs)->cs & 3))
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#define user_mode_vm(regs) user_mode(regs)
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#define instruction_pointer(regs) ((regs)->rip)
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#define regs_return_value(regs) ((regs)->rax)
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extern unsigned long profile_pc(struct pt_regs *regs);
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void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
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