2016-09-26 12:29 GMT+02:00 Paul Burton paul.burton@imgtec.com:
Something I've had in the U-Boot source we use on Boston, Malta & SEAD-3 boards internally for a while is the ability to longjmp back to the shell after an exception. It seems to work pretty well & generally means exceptions are non-fatal. I'll submit that once this goes in.
But this only works for commands issues at the U-Boot prompt? If the init code crashes, then you have no valid code to jump to.
- .macro RESTORE_TEMP
- LONG_L $24, PT_LO(sp)
- mtlo $24
- LONG_L $24, PT_HI(sp)
- mthi $24
The hi & lo bits here & in the save code above need to be wrapped in "#if __mips_isa_rev < 6", since the hi & lo registers were removed in MIPSr6.
ok, I'll do a resync with Linux's arch/mips/include/asm/stackframe.h.
+void trap_init(ulong reloc_addr)
+{
- unsigned long ebase = gd->irq_sp;
- set_handler(0x180, &except_vec3_generic, 0x80);
- set_handler(0x280, &except_vec_ejtag_debug, 0x80);
- write_c0_ebase(ebase);
- clear_c0_status(ST0_BEV);
I think strictly speaking we should probably have an ehb instruction at the end of trap_init so that we know the new ebase takes effect straight away.
Sounds plausible. Shall I import arch/mips/include/asm/hazards.h from Linux?
With the R6 change mentioned above this works fine on a 64r6el (I6400) Boston board, so feel free to add:
Reviewed-by: Paul Burton paul.burton@imgtec.com
Tested-by: Paul Burton paul.burton@imgtec.com
thanks for testing and reviewing