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1998-04-1 16:52  Philip Blundell  <pb@nexus.co.uk>

	* sysdeps/unix/sysv/linux/arm/socket.S: Correct test for error and
	use PLTJMP() rather than explicit (PLT).

	* sysdeps/arm/elf/start.S: Leave most of the initialisation for
	__libc_start_main().

	Based on patch from Pat Beirne:
	* sysdeps/unix/sysv/linux/arm/sysdep.h (SYSCALL_ERROR_HANDLER):
	Always define, not only #ifndef PIC.
	(DO_CALL): Pass fifth argument correctly in R4.
	(PSEUDO): Correct test for error, call syscall_error through PLT
	if PIC.

1998-03-31 10:51  Philip Blundell  <pb@nexus.co.uk>

	* sysdeps/unix/sysv/linux/netash/ash.h: Fix typos and add new
	definitions.
This commit is contained in:
Ulrich Drepper
1998-04-01 09:15:07 +00:00
parent 1d97d6ac3b
commit 652e8a1e1b
5 changed files with 97 additions and 68 deletions
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50
sysdeps/unix/sysv/linux/arm/sysdep.h
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@ -45,28 +45,64 @@
is a real error number. Linus said he will make sure the no syscall
returns a value in -1 .. -4095 as a valid result so we can savely
test with -4095. */
#undef PSEUDO
#define PSEUDO(name, syscall_name, args) \
.text; \
.type syscall_error,%function \
ENTRY (name) \
DO_CALL (args, syscall_name); \
cmn r0, $4096; \
bgt syscall_error;
bhs PLTJMP(syscall_error);
#undef PSEUDO_END
#define PSEUDO_END(name) \
SYSCALL_ERROR_HANDLER \
END (name)
#ifndef PIC
#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
#else
#error Aiee
#endif /* PIC */
/* Linux takes system call args in registers:
syscall number in the SWI instruction
arg 1 r0
arg 2 r1
arg 3 r2
arg 4 r3
arg 5 r4 (this is different from the APCS convention)
The compiler is going to form a call by coming here, through PSEUDO, with
arguments
syscall number in the DO_CALL macro
arg 1 r0
arg 2 r1
arg 3 r2
arg 4 r3
arg 5 [sp]
We need to shuffle values between R4 and the stack so that the caller's
R4 is not corrupted, and the kernel sees the right argument there.
*/
#undef DO_CALL
#define DO_CALL(args, syscall_name) \
swi SYS_ify (syscall_name);
#define DO_CALL(args, syscall_name) \
DOARGS_##args \
swi SYS_ify (syscall_name); \
UNDOARGS_##args
#define DOARGS_0 /* nothing */
#define DOARGS_1 /* nothing */
#define DOARGS_2 /* nothing */
#define DOARGS_3 /* nothing */
#define DOARGS_4 /* nothing */
#define DOARGS_5 ldr ip, [sp]; str r4, [sp]; mov r4, ip;
#define UNDOARGS_0 /* nothing */
#define UNDOARGS_1 /* nothing */
#define UNDOARGS_2 /* nothing */
#define UNDOARGS_3 /* nothing */
#define UNDOARGS_4 /* nothing */
#define UNDOARGS_5 ldr r4, [sp];
#endif /* ASSEMBLER */