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Loader.so+LibELF: Introduce "_LOADER_BREAKPOINT" environment variable

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If set, the dynamic loader will perform a software breakpoint after
loading all libraries, and just before jumping to the main entry point.

This allows a debugger to inspect the loaded libraries before the
program starts executing.
This commit is contained in:
Itamar 2021-01-06 21:53:20 +02:00 committed by Andreas Kling
parent bb90d961b8
commit ca9d6d21b5
Notes: sideshowbarker 2024-07-19 00:02:32 +09:00 
Author: https://github.com/itamar8910
Commit: https://github.com/SerenityOS/serenity/commit/ca9d6d21b5a
Pull-request: https://github.com/SerenityOS/serenity/pull/4852
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/awesomekling
1 changed files with 10 additions and 0 deletions
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10
Libraries/LibELF/DynamicLinker.cpp
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@ -231,6 +231,13 @@ static NonnullRefPtr<DynamicLoader> commit_elf(const String& name)
void ELF::DynamicLinker::linker_main(String&& main_program_name, int main_program_fd, int argc, char** argv, char** envp)
{
g_envp = envp;
bool do_breakpoint_trap_before_entry = false;
for (char** env = envp; *env; ++env) {
if (StringView { *env } == "_LOADER_BREAKPOINT=1") {
do_breakpoint_trap_before_entry = true;
}
}
map_library(main_program_name, main_program_fd);
map_dependencies(main_program_name);
@ -253,6 +260,9 @@ void ELF::DynamicLinker::linker_main(String&& main_program_name, int main_progra
MainFunction main_function = (MainFunction)(entry_point);
VERBOSE("jumping to main program entry point: %p\n", main_function);
if (do_breakpoint_trap_before_entry) {
asm("int3");
}
int rc = main_function(argc, argv, envp);
VERBOSE("rc: %d\n", rc);
if (g_libc_exit != nullptr) {