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| author | Matt Borgerson <mborgerson@gmail.com> | 2016-04-20 01:08:26 -0700 |
|---|---|---|
| committer | Matt Borgerson <mborgerson@gmail.com> | 2016-04-20 01:30:35 -0700 |
| commit | bceb2a5ae67e661b7ef00c07b14db425ca14453d (patch) | |
| tree | 6f79ff4903ec0213e676e4c2f7b97ce24d667d91 /gdbstub_int.nasm | |
| parent | e677c14dc715da62ad5749a4ab740803e58b0a7f (diff) | |
| download | gdbstub-bceb2a5ae67e661b7ef00c07b14db425ca14453d.tar.gz | |
Add GDB stub code
Diffstat (limited to 'gdbstub_int.nasm')
| -rw-r--r-- | gdbstub_int.nasm | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/gdbstub_int.nasm b/gdbstub_int.nasm new file mode 100644 index 0000000..836f865 --- /dev/null +++ b/gdbstub_int.nasm @@ -0,0 +1,106 @@ +; +; Copyright (C) 2016 Matt Borgerson +; +; This program is free software; you can redistribute it and/or modify +; it under the terms of the GNU General Public License as published by +; the Free Software Foundation; either version 2 of the License, or +; (at your option) any later version. +; +; This program is distributed in the hope that it will be useful, +; but WITHOUT ANY WARRANTY; without even the implied warranty of +; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +; GNU General Public License for more details. +; +; You should have received a copy of the GNU General Public License along +; with this program; if not, write to the Free Software Foundation, Inc., +; 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +; + +bits 32 + +%define NUM_HANDLERS 32 + +section .data +global dbg_int_handlers + +; Generate table of handlers +dbg_int_handlers: +%macro handler_addr 1 + dd dbg_int_handler_%1 +%endmacro +%assign i 0 +%rep NUM_HANDLERS + handler_addr i + %assign i i+1 +%endrep + +section .text +extern dbg_int_handler + +%macro int 1 +dbg_int_handler_%1: + push 0 ; Dummy Error code + push %1 ; Interrupt Vector + jmp dbg_int_handler_common +%endmacro + +%macro inte 1 +dbg_int_handler_%1: + ; Error code already on stack + push %1 ; Interrupt Vector + jmp dbg_int_handler_common +%endmacro + +; Generate Interrupt Handlers +%assign i 0 +%rep NUM_HANDLERS + %if (i == 8) || ((i >= 10) && (i <= 14)) || (i == 17) + inte i + %else + int i + %endif +%assign i i+1 +%endrep + +; Common Interrupt Handler +dbg_int_handler_common: + pushad + push ds + push es + push fs + push gs + push ss + mov ebp, esp + + ; Stack: + ; - EFLAGS + ; - CS + ; - EIP + ; - ERROR CODE + ; - VECTOR + ; - EAX + ; - ECX + ; - EDX + ; - EBX + ; - ESP + ; - EBP + ; - ESI + ; - EDI + ; - DS + ; - ES + ; - FS + ; - GS + ; - SS + + push ebp + call dbg_int_handler + + mov esp, ebp + pop ss + pop gs + pop fs + pop es + pop ds + popad + add esp, 8 ; Pop error & vector + iret |