Hi,
im using the armasm assembler, and i learnt what literal pools are while reading the ads assembler guide. i am using atmel`s pre-canned libraries for low level inits. i have seen that the cstartup file has code thats written in a particular way. u can see that at the end of the section, the symbols like "at91_default_fiq_handler" etc are stored nearby explicitly using DCD. we could also have used something like
ldr r0, =at91_default_fiq_handler
why is this being done? does it have something to do with a literal pool?
---------------------------------------------------------------------------
;- Advanced Interrupt Controller configuration
;---------------------------------------------------------------------------
;- Set up the default vectors
;---------------------------------------------------------------------------
;- Load the AIC Base Address and the default handler addresses
add r0, pc,#-(8+.-AicData) ; @ where to read values (relative)
ldmia r0, {r1-r4}
;- Setup the Spurious Vector
.. .. .. .. .. .. str r4, [r1, #AIC_SPU] ; r4 =spurious handler
;---------------------------------------------------------------------------
;- Default Interrupt Handler
;---------------------------------------------------------------------------
AicData
DCD AT91C_BASE_AIC; AIC Base Address
IMPORT at91_default_fiq_handler
IMPORT at91_default_irq_handler
IMPORT at91_spurious_handler
PtDefaultHandler
DCD at91_default_fiq_handler
DCD at91_default_irq_handler
DCD at91_spurious_handler EndInitAic
Thanx in anticipation
Mayank