diff options
Diffstat (limited to 'debug_rom')
| -rwxr-xr-x | debug_rom/debug_rom.S | 20 | ||||
| -rw-r--r-- | debug_rom/debug_rom.h | 33 |
2 files changed, 29 insertions, 24 deletions
diff --git a/debug_rom/debug_rom.S b/debug_rom/debug_rom.S index b1fa8bd..35dd406 100755 --- a/debug_rom/debug_rom.S +++ b/debug_rom/debug_rom.S @@ -29,15 +29,14 @@ entry: j _entry resume: j _resume exception: - # Flip the LSB of the first word in Debug RAM so the debugger can know - # that we hit an exception. - lw s1, (DEBUG_RAM)(zero) - xori s1, s1, 1 - sw s1, (DEBUG_RAM)(zero) - - # Fall through to resume. + # Set the last word of Debug RAM to all ones, to indicate that we hit + # an exception. + li s0, ~0 + j _resume2 _resume: + li s0, 0 +_resume2: # Clear debug interrupt. csrr s1, CSR_MHARTID sw s1, CLEARDEBINT(zero) @@ -58,6 +57,11 @@ restore_64: restore_128: nop #lq s1, (DEBUG_RAM + DEBUG_RAM_SIZE - 16)(zero) + # s0 contains ~0 if we got here through an exception, and 0 otherwise. + # Store this to the last word in Debug RAM so the debugger can tell if + # an exception occurred. + sw s0, (DEBUG_RAM + DEBUG_RAM_SIZE - 4)(zero) + check_halt: csrr s0, DCSR andi s0, s0, (1<<DCSR_HALT_OFFSET) @@ -68,7 +72,7 @@ exit: # Restore s0. csrr s0, DSCRATCH # TODO: dret? - mret + sret _entry: diff --git a/debug_rom/debug_rom.h b/debug_rom/debug_rom.h index f8aa2e0..8b5ea69 100644 --- a/debug_rom/debug_rom.h +++ b/debug_rom/debug_rom.h @@ -1,18 +1,19 @@ static const unsigned char debug_rom_raw[] = { - 0x6f, 0x00, 0xc0, 0x05, 0x6f, 0x00, 0x00, 0x01, 0x83, 0x24, 0x00, 0xc0, - 0x93, 0xc4, 0x14, 0x00, 0x23, 0x20, 0x90, 0xc0, 0xf3, 0x24, 0x50, 0xf1, - 0x23, 0x2c, 0x90, 0xee, 0x0f, 0x00, 0xf0, 0x0f, 0xf3, 0x24, 0x00, 0xf1, - 0x63, 0xc6, 0x04, 0x00, 0x83, 0x24, 0xc0, 0xc3, 0x6f, 0x00, 0x80, 0x01, - 0x93, 0x94, 0x14, 0x00, 0x63, 0xc6, 0x04, 0x00, 0x83, 0x34, 0x80, 0xc3, - 0x6f, 0x00, 0x80, 0x00, 0x13, 0x00, 0x00, 0x00, 0x73, 0x24, 0x00, 0x79, - 0x13, 0x74, 0x84, 0x00, 0x63, 0x04, 0x04, 0x00, 0x6f, 0x00, 0x40, 0x05, - 0x73, 0x24, 0x20, 0x79, 0x73, 0x00, 0x20, 0x10, 0x73, 0x10, 0x24, 0x79, - 0x73, 0x24, 0x00, 0x79, 0x13, 0x74, 0x74, 0x00, 0x13, 0x04, 0xd4, 0xff, - 0x63, 0x16, 0x04, 0x02, 0x73, 0x24, 0x00, 0xf1, 0x63, 0x46, 0x04, 0x00, - 0x23, 0x2e, 0x90, 0xc2, 0x67, 0x00, 0x00, 0xc0, 0x13, 0x14, 0x14, 0x00, - 0x63, 0x46, 0x04, 0x00, 0x23, 0x3c, 0x90, 0xc2, 0x67, 0x00, 0x00, 0xc0, - 0x13, 0x00, 0x00, 0x00, 0x67, 0x00, 0x00, 0xc0, 0x73, 0x24, 0x50, 0xf1, - 0x23, 0x20, 0x80, 0xf0, 0x73, 0x60, 0x04, 0x79, 0x73, 0x24, 0x00, 0x79, - 0x13, 0x74, 0x04, 0x40, 0xe3, 0x0c, 0x04, 0xfe, 0x6f, 0xf0, 0x1f, 0xfc + 0x6f, 0x00, 0x00, 0x06, 0x6f, 0x00, 0xc0, 0x00, 0x13, 0x04, 0xf0, 0xff, + 0x6f, 0x00, 0x80, 0x00, 0x13, 0x04, 0x00, 0x00, 0xf3, 0x24, 0x40, 0xf1, + 0x23, 0x24, 0x90, 0x10, 0x0f, 0x00, 0xf0, 0x0f, 0xf3, 0x24, 0x00, 0xf1, + 0x63, 0xc6, 0x04, 0x00, 0x83, 0x24, 0xc0, 0x43, 0x6f, 0x00, 0xc0, 0x01, + 0x93, 0x94, 0x14, 0x00, 0x63, 0xc6, 0x04, 0x00, 0x83, 0x34, 0x80, 0x43, + 0x6f, 0x00, 0xc0, 0x00, 0x13, 0x00, 0x00, 0x00, 0x23, 0x2e, 0x80, 0x42, + 0x73, 0x24, 0x00, 0x79, 0x13, 0x74, 0x84, 0x00, 0x63, 0x04, 0x04, 0x00, + 0x6f, 0x00, 0x40, 0x05, 0x73, 0x24, 0x20, 0x79, 0x73, 0x00, 0x00, 0x10, + 0x73, 0x10, 0x24, 0x79, 0x73, 0x24, 0x00, 0x79, 0x13, 0x74, 0x74, 0x00, + 0x13, 0x04, 0xd4, 0xff, 0x63, 0x16, 0x04, 0x02, 0x73, 0x24, 0x00, 0xf1, + 0x63, 0x46, 0x04, 0x00, 0x23, 0x2e, 0x90, 0x42, 0x67, 0x00, 0x00, 0x40, + 0x13, 0x14, 0x14, 0x00, 0x63, 0x46, 0x04, 0x00, 0x23, 0x3c, 0x90, 0x42, + 0x67, 0x00, 0x00, 0x40, 0x13, 0x00, 0x00, 0x00, 0x67, 0x00, 0x00, 0x40, + 0x73, 0x24, 0x40, 0xf1, 0x23, 0x20, 0x80, 0x10, 0x73, 0x60, 0x04, 0x79, + 0x73, 0x24, 0x00, 0x79, 0x13, 0x74, 0x04, 0x40, 0xe3, 0x0c, 0x04, 0xfe, + 0x6f, 0xf0, 0x1f, 0xfc }; -static const unsigned int debug_rom_raw_len = 180; +static const unsigned int debug_rom_raw_len = 184; |