1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/*
* 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)
// The DEF_CVAR macros put stuff in .rdata$y/.rodata.cvars1. Sandwiching that
// between empty x/0 and z/2 sections gives us section start/end pointers to
// iterate the cvars, which is used for freeing the values on unload. Relies
// on the section merging not adding extra padding, which is fine with the
// linker + settings we use in practice.
#ifdef _WIN32
.section .rdata$x, "rw"
#else
.section .rodata.cvars0, "rw"
#endif
.globl ASM_MANGLE(_con_vars_start)
ASM_MANGLE(_con_vars_start):
#ifdef _WIN32
.section .rdata$z, "rw"
#else
.section .rodata.cvars2, "rw"
#endif
.globl ASM_MANGLE(_con_vars_end)
ASM_MANGLE(_con_vars_end):
// vi: sw=4 ts=4 noet tw=80 cc=80
|
