From 7a07c08abe46f97f2412f06c77204e9015f97a47 Mon Sep 17 00:00:00 2001 From: Michael Smith Date: Thu, 18 Dec 2025 21:35:50 +0000 Subject: Move to a shared static RWX section Does away with the need to mark a region as executable on load. Also allows the self-modified stuff and hook trampolines to fit in the same page, so we take up ever-so-slightly less memory. Unfortunately I had issues getting the test binary to build correctly and eventually decided to give up as it wasn't testing much of value anyway. Also note that the build now allows for .c and .S files with the same basename, which required renaming the .o files, so you might want to clean out your .build/ directory before building this one. --- src/hook.S | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 src/hook.S (limited to 'src/hook.S') diff --git a/src/hook.S b/src/hook.S new file mode 100644 index 0000000..7baa856 --- /dev/null +++ b/src/hook.S @@ -0,0 +1,26 @@ +/* + * Copyright © Michael Smith + * + * 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" +#include "rwx.h" + +#define SPACE 2048 // NOTE: MUST match SPACE in hook.c! + +.section RWX_SECTION, RWX_SECTION_FLAGS +.globl ASM_MANGLE(_hook_trampolinespc) +.comm ASM_MANGLE(_hook_trampolinespc), SPACE + +// vi: sw=4 ts=4 noet tw=80 cc=80 -- cgit v1.2.3-54-g00ecf