[ECOS] Bug in arm vectors.S ???

[Carl van Schaik <carl at leg dot uct dot ac dot za>]

Hi

With refernece to the lines :

        str     r2,[r0,#0x10]
        ldr     r2,[r1,#0x30]
        str     r2,[r0,#0x30]

        LED 4

#if defined(CYG_HAL_STARTUP_ROM)
        // Set up reset vector
        ldr     r2,[r1,#0x00]    // reset vector intstruction
        str     r2,[r0,#0x00]
        ldr     r2,=warm_reset
        str     r2,[r0,#0x20]
        // Relocate [copy] data from ROM to RAM
        ldr     r3,.__rom_data_start
        ldr     r4,.__ram_data_start
        ldr     r5,.__ram_data_end

After the "LED" macro, r0 and r1 may have been corrupted, I know in my
port and in the pid hal_platform_setup.h the LED routines are using r0 and
not restoring it. Thus an <abort_prefetch> could occur.

Am I correct in this assumption? Should the LED code not use r0 and r1?
Should the code above be modified? by inserting
"
        mov     r0,#0           // move vectors
        ldr     r1,.__exception_handlers
"
after the LED 4 macro.

thanks

Carl van Schaik   <carl@leg.uct.ac.za>
-----------------------------------------------------
Dept. Electrical Engineering, UCT

621 Menzies Building
University of Cape Town
Rondebosch   
Western Cape
7700
South Africa

Tel: +27 21 650-3467
Fax: +27 21 650-3465