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| author | andrew <andrew@FreeBSD.org> | 2013-01-19 04:03:18 +0000 |
|---|---|---|
| committer | andrew <andrew@FreeBSD.org> | 2013-01-19 04:03:18 +0000 |
| commit | 109e426da134da0aa0a02bfa0f7bc2c02de562df (patch) | |
| tree | f8de5634d2814d589fcf95133b4f1b9d6f7fbe35 /lib/libc/arm/SYS.h | |
| parent | 388178c195ed8f369019ba43899e39da72e35e87 (diff) | |
| download | FreeBSD-src-109e426da134da0aa0a02bfa0f7bc2c02de562df.zip FreeBSD-src-109e426da134da0aa0a02bfa0f7bc2c02de562df.tar.gz | |
Update the syscall calling convention for ARM EABI. We store the syscall
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.
Diffstat (limited to 'lib/libc/arm/SYS.h')
| -rw-r--r-- | lib/libc/arm/SYS.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/libc/arm/SYS.h b/lib/libc/arm/SYS.h index 584c151..ed1a045 100644 --- a/lib/libc/arm/SYS.h +++ b/lib/libc/arm/SYS.h @@ -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) |
