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Add support for symbol table in .com files

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This change fixes minor bugs and adds a feature, which lets us store the
ELF symbol table, inside the ZIP directory. We use the path /zip/.symtab
which can be safely removed using a zip editing tool, to make the binary
smaller after compilation. This supplements the existing method of using
a separate .com.dbg file, which is still supported. The intent is people
don't always know that it's a good idea to download the debug file. It's
not great having someone's first experience be a crash report, that only
has numbers rather than symbols. This will help fix that!
This commit is contained in:
Justine Tunney 2022-03-23 06:31:55 -07:00
parent 393ca4be40
commit 23b72eb617
61 changed files with 963 additions and 510 deletions
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19
libc/runtime/ftracer.c
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@ -102,18 +102,13 @@ privileged noinstrument noasan noubsan void ftracer(void) {
}
textstartup void ftrace_install(void) {
const char *path;
if ((path = FindDebugBinary())) {
if ((g_symbols = OpenSymbolTable(path))) {
laststamp = kStartTsc;
g_lastsymbol = -1;
g_skew = GetNestingLevelImpl(__builtin_frame_address(0));
ftrace_enabled = 1;
__hook(ftrace_hook, g_symbols);
} else {
kprintf("error: --ftrace failed to open symbol table\r\n");
}
if ((g_symbols = GetSymbolTable())) {
laststamp = kStartTsc;
g_lastsymbol = -1;
g_skew = GetNestingLevelImpl(__builtin_frame_address(0));
ftrace_enabled = 1;
__hook(ftrace_hook, g_symbols);
} else {
kprintf("error: --ftrace needs concomitant .com.dbg binary\r\n");
kprintf("error: --ftrace failed to open symbol table\r\n");
}
}