I am involved in programming computer without any operating system on top. I
practised intel assembly in qemu and try to run an assembly program on the
yeeloong laptop. I use a gnu toolchain mipsel build from embedian.
Here is the code:
> .text
> .globl __start
> __start:
> li $8, 5
> li $9, 5
>
I use a linker script as such:
> SECTIONS
> {
> . = 0xffffffff80000000;
> .text : { * (.text); }
> }
>
The makefile is as simple:
CROSS=mipsel-linux-gnu-
> CC=${CROSS}gcc
> OBJCOPY=${CROSS}objcopy
> LDFLAGS=-mips3 -T test.lds -Wall -nostdlib
>
> test.elf: test.s test.c
> ${CC} $(LDFLAGS) $^ -o $@
>
Once compiled, I copy it in a tftp server directory. In the pmon's prompt, I
set an IP address then load the program from the server.
Using pmon's r command, I can't see any change in registers (t0 to t7 set to
00000000). So is my program really executed? Do I need any kind of
initialization?
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