diff options
| author | Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> | 2008-03-26 13:40:36 +0000 |
|---|---|---|
| committer | Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> | 2008-03-26 13:40:36 +0000 |
| commit | efce79f09ae6daa77cd322df0d532beec3f445f5 (patch) | |
| tree | ae936850c5671b8bea0abf0d33bf2196f7abc796 /libc/sysdeps/linux/arm/syscall-eabi.S | |
| parent | 17e961d9c708ab202760ce830f8efe73e91bb129 (diff) | |
Paul Brook writes:
The attached patch adds support for compiling arm uClibc as pure Thumb code.
This is needed because some recent ARM codes do not implement traditional ARM
mode. Specifically:
* Cortex-M1 - An extremely minimal FPGA based core that only implements
Thumb-1 (aka ARMv6-M).
* Cortex-M3 - A Thumb-2 only ARMv7-M core.
Most of uClibc already builds in Thumb mode, all that is left are a handful of
assembly bits.
Tested on arm-uclinuxeabi.
Diffstat (limited to 'libc/sysdeps/linux/arm/syscall-eabi.S')
| -rw-r--r-- | libc/sysdeps/linux/arm/syscall-eabi.S | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/arm/syscall-eabi.S b/libc/sysdeps/linux/arm/syscall-eabi.S index efc30690c..b9318821b 100644 --- a/libc/sysdeps/linux/arm/syscall-eabi.S +++ b/libc/sysdeps/linux/arm/syscall-eabi.S @@ -17,6 +17,7 @@ 02111-1307 USA. */ #include <sys/syscall.h> +#include <bits/arm_asm.h> /* In the EABI syscall interface, we don't need a special syscall to implement syscall(). It won't work reliably with 64-bit arguments @@ -26,6 +27,29 @@ .global syscall .type syscall,%function .align 4 +#if defined(THUMB1_ONLY) +.thumb_func +syscall: + push {r4, r5, r6, r7} + mov ip, r0 + mov r0, r1 + mov r1, r2 + mov r2, r3 + add r7, sp, #(4 * 4) + ldmia r7!, {r3, r4, r5, r6} + mov r7, ip + swi 0x0 + pop {r4, r5, r6, r7} + ldr r1, =0xfffff000 + cmp r0, r1 + bcs 1f + bx lr +1: + push {r3, lr} + bl __syscall_error + POP_RET +.pool +#else syscall: mov ip, sp stmfd sp!, {r4, r5, r6, r7} @@ -37,11 +61,13 @@ syscall: swi 0x0 ldmfd sp!, {r4, r5, r6, r7} cmn r0, #4096 + IT(t, cc) #if defined(__USE_BX__) bxcc lr #else movcc pc, lr #endif b __syscall_error +#endif .size syscall,.-syscall |