Re: [Qemu-devel] Re: Solaris/SPARC binaries

[Blue Swirl]

> well, just to let you know ... I'm interested in the emulator
> (is there some howto available, regarding openprom and such?)

http://www.openfirmware.org/

I've learned most things by reading the sources (Proll, Linux 
arch/sparc/prom, silo). Luckily, the code base is not large.

A nice way of getting into action could be trying to run a simple 
application in the user mode emulator and see if it breaks and why. The 
debug logs are very interesting, as is tracing execution with outside gdb.

Here's an example with Linux and system emulator.
One shell:
qemu-system-sparc -kernel vmlinux-2.6.11+tcx -d in_asm,int -nographic -s -S
Other shell:
sparc-linux-gdb vmlinux-2.6.11+tcx
(here's a cross-gdb, could be a native gdb in remote Sparc machine)
(optionally in a third shell: tail -f /tmp/qemu.log)
(gdb) b prom_init
Breakpoint 1 at 0xf0266b78: file arch/sparc/prom/init.c, line 46.
(gdb) target remote :1234
0xffd00000 in ?? ()
(gdb) c

Breakpoint 1, prom_init (rp=0xffd1b538) at arch/sparc/prom/init.c:46
46      arch/sparc/prom/init.c: No such file or directory.
       in arch/sparc/prom/init.c
(gdb) fin
0xf0251790 in sun4c_continue_boot () at include/asm/uaccess.h:305
305     include/asm/uaccess.h: No such file or directory.
       in include/asm/uaccess.h
(gdb) p/x *romvec
$4 = {pv_magic_cookie = 0x10010407, pv_romvers = 0x3,
 pv_plugin_revision = 0x4d, pv_printrev = 0x10203, pv_v0mem = {
[etc.]

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