diff options
| author | Markos Chandras <markos.chandras@imgtec.com> | 2008-02-05 14:51:48 +0000 |
|---|---|---|
| committer | Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> | 2013-03-14 22:45:15 +0100 |
| commit | 22686a1383c4a4a319eaaa6b16b1a9540114bd66 (patch) | |
| tree | 04e12086f9187c150ba6a33db0368b9903e50363 /libc/sysdeps/linux/metag/clone.S | |
| parent | 37439e66a31f251eba39604885f57099a43d943d (diff) | |
Add support for the Meta architecture
Meta cores are 32-bit, hardware multithreaded, general purpose, embedded
processors which also feature a DSP instruction set, and can be found in
many digital radios. They are capable of running different operating
systems on different hardware threads, for example a digital radio might
run RTOSes for DAB decoding and audio decoding on 3 hardware threads,
and run Linux on the 4th hardware thread to manage the user interface,
networking etc. HTPs are also capable of running SMP Linux on multiple
hardware threads.
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Diffstat (limited to 'libc/sysdeps/linux/metag/clone.S')
| -rw-r--r-- | libc/sysdeps/linux/metag/clone.S | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/metag/clone.S b/libc/sysdeps/linux/metag/clone.S new file mode 100644 index 000000000..8fff56710 --- /dev/null +++ b/libc/sysdeps/linux/metag/clone.S @@ -0,0 +1,65 @@ +! Copyright (C) 2013 Imagination Technologies Ltd. + +! Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball. + +! clone() is even more special than fork() as it mucks with stacks +! and invokes a function in the right context after its all over. + +#include <asm/errno.h> +#include <asm/unistd.h> + +/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ + + .text + .global __clone + .type __clone,function +__clone: + ! sanity check args + MOV D0Re0, #-EINVAL + CMP D1Ar1, #0 + BEQ ___error + CMP D0Ar2, #0 + BEQ ___error + + ! save function pointer + MOV D0FrT, D1Ar1 + + ! do the system call + ! get flags + MOV D1Ar1, D1Ar3 + ! new sp is already in D0Ar2 + MOV D1Re0, #__NR_clone + SWITCH #0x440001 + CMP D0Re0,#0 + ! Error on -1 + BLT ___error + ! If non-zero we are the parent + MOVNE PC, D1RtP + ! BRKPNT + + ! We are the child + ! pick the function arg and call address off the stack and execute + MOV D0Ar2, D0FrT + MOV D1Ar1, D0Ar4 + MOV D1RtP, PC + ADD D1RtP, D1RtP, #8 + MOV PC, D0Ar2 + + ! and we are done, passing the return value through D0Re0 +#ifdef __PIC__ + B _exit@PLT +#else + B _exit +#endif + +___error: + MOV D1Ar1, D0Re0 +#ifdef __PIC__ + B ___syscall_error@PLT +#else + B ___syscall_error +#endif + .size __clone, .-__clone + +.weak _clone +_clone = __clone |