[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>

diff --git a/include/asm-i386/ptrace.h b/include/asm-i386/ptrace.h
index a4a0e5207db58627c4ef02eb1a22eceb54c20a86..d505f501077a67bc77b01729a724b61eb6e26b7a 100644 (file)
--- a/include/asm-i386/ptrace.h
+++ b/include/asm-i386/ptrace.h
@@ -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__ */
 

diff --git a/include/asm-ia64/ptrace.h b/include/asm-ia64/ptrace.h
index 1414316efd405028d84a357a198a7fd3684e8f2a..f4ef87a3623674db5c8510374aeb0b3ecea8d333 100644 (file)
--- a/include/asm-ia64/ptrace.h
+++ b/include/asm-ia64/ptrace.h
@@ -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.
  */

diff --git a/include/asm-powerpc/ptrace.h b/include/asm-powerpc/ptrace.h
index 4435efe85d0edb37cd2d3de5b0307140cb8375b1..4ad77a13f8652ebdf69aa2225ceea03346916212 100644 (file)
--- a/include/asm-powerpc/ptrace.h
+++ b/include/asm-powerpc/ptrace.h
@@ -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

diff --git a/include/asm-s390/ptrace.h b/include/asm-s390/ptrace.h
index 8d2bf65b0b6487a4c64df4444f3740d16c0428cb..7b768c5c68a8226b43cffbfb44ce7f9ed9aa4615 100644 (file)
--- a/include/asm-s390/ptrace.h
+++ b/include/asm-s390/ptrace.h
@@ -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

diff --git a/include/asm-x86_64/ptrace.h b/include/asm-x86_64/ptrace.h
index ab827dc381d7f3c0afe18b37811d817b7b6e7d73..5ea84dbb1e9ce5f07278cb678f00291fbc64e0a5 100644 (file)
--- a/include/asm-x86_64/ptrace.h
+++ b/include/asm-x86_64/ptrace.h
@@ -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);