diff options
Diffstat (limited to 'src/con_.S')
| -rw-r--r-- | src/con_.S | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/con_.S b/src/con_.S new file mode 100644 index 0000000..0c6ec2d --- /dev/null +++ b/src/con_.S @@ -0,0 +1,45 @@ +/* + * Copyright © Michael Smith <mikesmiffy128@gmail.com> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR + * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +#include "asm.h" + +// On Windows, _con_colourmsg is subject to selfmod() in con_.c which overwrites +// it with another implementation on OE; put it in rwx. On Linux, .text is fine. +#ifdef _WIN32 +.section ASM_RWX_SECTION, ASM_RWX_SECTION_FLAGS +#else +.section .text, "xr" +#endif +.globl ASM_MANGLE(_con_colourmsg) +.p2align 4 +ASM_MANGLE(_con_colourmsg): + // For some reason the assembler arbitrarily refuses to put instructions in + // a section marked as containing uninitialised data. So, we have to list + // out the instruction bytes manually here: + // mov eax, [_con_iface] + .byte 0xA1 + .long ASM_MANGLE(_con_iface) + // mov [esp + 4], eax // put coniface in the empty stack slot + .byte 0x89 + .byte 0x44 + .byte 0x24 + .byte 0x04 + // jmp dword ptr _con_colourmsgf // jump to the real function + .byte 0xFF + .byte 0x25 + .long ASM_MANGLE(_con_colourmsgf) + +// vi: sw=4 ts=4 noet tw=80 cc=80 |