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Branching to main form assembly error

Note: This was originally posted on 25th August 2012 at http://forums.arm.com

Hey guys, do you know why a simple branch to main from the reset handler causes an hard fault? Heres an example where I try to branch to main via the reset hander in the startup file provided by Keil and this causes an

hard fault. Any cue?

Reset_Handler    PROC
                 EXPORT Reset_Handler             [WEAK]
     IMPORT __main

                LDR     R0, =__main
                BX      R0
                ENDP

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Martin Weidmann over 12 years ago

Note: This was originally posted on 28th August 2012 at http://forums.arm.com

Your solution could cause you other problems.

The __main label is ARM's scatter loading + C library init code, which itself calls main(). So by calling main() you are by-passing the C library initialization. This may be ok, but could lead to interesting problems. For example, global variables probably won't have their initial values set.

I don't know the Keil tools to know why it didn't work before. Have you tried the dedicated Keil forums?
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Martin Weidmann over 12 years ago

Note: This was originally posted on 28th August 2012 at http://forums.arm.com

Your solution could cause you other problems.

The __main label is ARM's scatter loading + C library init code, which itself calls main(). So by calling main() you are by-passing the C library initialization. This may be ok, but could lead to interesting problems. For example, global variables probably won't have their initial values set.

I don't know the Keil tools to know why it didn't work before. Have you tried the dedicated Keil forums?
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