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Update the syscall calling convention for ARM EABI. We store the syscall

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in r7 and use ip to store the old version of r7 as it is not guaranteed to
be kept when calling a subroutine. The kernel will preserve the register
across system calls.
This commit is contained in:
Andrew Turner 2013-01-19 04:03:18 +00:00
parent 773e120f25
commit 2aebb6cefe
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=245650
1 changed files with 8 additions and 0 deletions
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8
lib/libc/arm/SYS.h
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@ -39,7 +39,15 @@
#include <sys/syscall.h>
#include <machine/swi.h>
#ifdef __ARM_EABI__
#define SYSTRAP(x) \
mov ip, r7; \
ldr r7, =SYS_ ## x; \
swi 0; \
mov r7, ip
#else
#define SYSTRAP(x) swi 0 | SYS_ ## x
#endif
#define CERROR _C_LABEL(cerror)
#define CURBRK _C_LABEL(curbrk)