Den 02-06-2013 23:15, Michael Ring skrev:
Unfortunately that does not seem to work (or I use it wrong):
This procedure:
procedure _general_exception_handler; assembler; nostackframe; public
name '_GENERAL_EXCEPTION_HANDLER';
asm
.section "reset"
sdbbp 0;
.Lloopb:
b .Lloopb
end;
translates to:
.section .text.n_pic32mx1xxfxxxc_$$__general_exception_handler
.balign 4
.globl PIC32MX1XXFXXXC_$$__GENERAL_EXCEPTION_HANDLER
.type PIC32MX1XXFXXXC_$$__GENERAL_EXCEPTION_HANDLER,@function
PIC32MX1XXFXXXC_$$__GENERAL_EXCEPTION_HANDLER:
.globl _GENERAL_EXCEPTION_HANDLER
.type _GENERAL_EXCEPTION_HANDLER,@function
_GENERAL_EXCEPTION_HANDLER:
.ent PIC32MX1XXFXXXC_$$__GENERAL_EXCEPTION_HANDLER
.section reset
sdbbp 0
.Lj11:
b .Lj11
jr $ra
nop
.set macro
.set reorder
.end PIC32MX1XXFXXXC_$$__GENERAL_EXCEPTION_HANDLER
.Lt3:
.Le2:
.size PIC32MX1XXFXXXC_$$__GENERAL_EXCEPTION_HANDLER, .Le2 -
PIC32MX1XXFXXXC_$$__GENERAL_EXCEPTION_HANDLER
.Ll8:
which creates an assembler error:
/Users/ring/devel/fpc/rtl/units/mipsel-embedded/pic32mx1xxfxxxc.s:94:
Error: operation combines symbols in different segments
the error is from the .size line.
Am 02.06.13 22:51, schrieb Jeppe Græsdal Johansen:
Den 02-06-2013 22:41, Michael Ring skrev:
Hi, perhaps I am overseeing a simple solution for my problem:
On the pic32 there are two flash areas, one at 0x9d000000 for the
main program and another at 0xbfc00000 that is called Boot Flash. On
reset the program starts in the boot flash at the first address.
I have written the startup code for the chips now but I need to
distribute some procedures between the two memory areas, for obvious
reasons I must have some code at address 0xbfc00000 or the chip will
not boot correctly ;-).
My thought was now to tweak the linker script in the same way the
original linker scripts of pic32 work:
MEMORY
{
kseg0_program_mem (rx) : ORIGIN = 0x9D000000, LENGTH = 0x80000
kseg1_boot_mem : ORIGIN = 0xBFC00000, LENGTH = 0x490
}
SECTIONS
{
.reset _RESET_ADDR :
{
KEEP(*(.reset))
KEEP(*(.reset.startup))
} > kseg1_boot_mem
}
In assembler I can then simply write:
.section .reset,code and
.section .reset.startup,code
and then the code, this will automagically end up in the
kseg1_boot_mem, but this does not work with the inline assembler.
Any ideas on how to do this the correct way? Is there something more
intelligent than to write a plain assembler file?
TnX,
Michael
You should be able to use
.section ".reset"
Try
procedure _general_exception_handler; assembler; nostackframe; public
name '_GENERAL_EXCEPTION_HANDLER';
asm
.section "reset"
sdbbp 0;
.Lloopb:
b .Lloopb
.text
end;
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