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aarch64: Tidy syscall error check

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Move the error branch from the PSEUDO_RET macro to the PSEUDO macro.
This is in line with other architectures, and will enable further improvments.
This commit is contained in:
Richard Henderson
2014-05-20 14:40:22 -04:00
parent 6e6c2d01eb
commit ca3cfa40c1
3 changed files with 21 additions and 10 deletions
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18
sysdeps/unix/sysv/linux/aarch64/sysdep.h
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@ -58,17 +58,15 @@
.text; \
ENTRY (name); \
DO_CALL (syscall_name, args); \
cmn x0, #4095;
cmn x0, #4095; \
b.cs .Lsyscall_error;
/* Notice the use of 'RET' instead of 'ret' the assembler is case
insensitive and eglibc already uses the preprocessor symbol 'ret'
so we use the upper case 'RET' to force through a ret instruction
to the assembler */
# define PSEUDO_RET \
b.cs 1f; \
RET; \
1: \
b SYSCALL_ERROR
RET;
# undef ret
# define ret PSEUDO_RET
@ -112,10 +110,10 @@
# define ret_ERRVAL PSEUDO_RET_NOERRNO
# if NOT_IN_libc
# define SYSCALL_ERROR __local_syscall_error
# define SYSCALL_ERROR .Lsyscall_error
# if RTLD_PRIVATE_ERRNO
# define SYSCALL_ERROR_HANDLER \
__local_syscall_error: \
.Lsyscall_error: \
adrp x1, C_SYMBOL_NAME(rtld_errno); \
neg w0, w0; \
str w0, [x1, :lo12:C_SYMBOL_NAME(rtld_errno)]; \
@ -124,7 +122,7 @@ __local_syscall_error: \
# else
# define SYSCALL_ERROR_HANDLER \
__local_syscall_error: \
.Lsyscall_error: \
stp x29, x30, [sp, -32]!; \
cfi_adjust_cfa_offset (32); \
cfi_rel_offset (x29, 0); \
@ -143,8 +141,10 @@ __local_syscall_error: \
RET;
# endif
# else
# define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
# define SYSCALL_ERROR __syscall_error
# define SYSCALL_ERROR_HANDLER \
.Lsyscall_error: \
b __syscall_error;
# endif
/* Linux takes system call args in registers: