[Crash-utility] Re: [PATCH 2/3] Enable demangling a mangled Rust support

Without the patch: crash> bt PID: 3520 TASK: ffff8f240f670000 CPU: 1 COMMAND: "insmod" #0 [ffffd08c4f063a20] machine_kexec at ffffffff9575e60e #1 [ffffd08c4f063a40] __crash_kexec at ffffffff958db711 #2 [ffffd08c4f063b00] panic at ffffffff9560cede #3 [ffffd08c4f063b80] _RNvCscb18lrEyTSA_10rust_panic10area_in_hp at ffffffffc07fe107 [rust_panic] #4 [ffffd08c4f063c20] _RNvMCscb18lrEyTSA_10rust_panicNtB2_10HelloPanic8step_two at ffffffffc07fe160 [rust_panic] ... crash> sym _RNvCscb18lrEyTSA_10rust_panic10area_in_hp ffffffffc07fe010 (t) _RNvCscb18lrEyTSA_10rust_panic10area_in_hp [rust_panic] /root/linux-6.16.3/samples/rust/rust_panic.rs: 22 With the patch: crash> bt PID: 3520 TASK: ffff8f240f670000 CPU: 1 COMMAND: "insmod" #0 [ffffd08c4f063a20] machine_kexec at ffffffff9575e60e #1 [ffffd08c4f063a40] __crash_kexec at ffffffff958db711 #2 [ffffd08c4f063b00] panic at ffffffff9560cede #3 [ffffd08c4f063b80] rust_panic::area_in_hp at ffffffffc07fe107 [rust_panic] #4 [ffffd08c4f063c20] <rust_panic::HelloPanic>::step_two at ffffffffc07fe160 [rust_panic] ... crash> sym "rust_panic::area_in_hp" ffffffffc07fe010 (t) rust_panic::area_in_hp [rust_panic] /root/linux-6.16.3/samples/rust/rust_panic.rs: 22 Signed-off-by: Lianbo Jiang <lijiang(a)redhat.com&gt; --- symbols.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/symbols.c b/symbols.c index 052196265be0..7e9f57be7cec 100644 --- a/symbols.c +++ b/symbols.c @@ -3277,6 +3277,46 @@ load_module_filter(char *s, int type) #define AVERAGE_SYMBOL_SIZE (16) +static size_t rust_demangle_symbol(const char *symbol, char *out, size_t out_size) +{ + int i; + size_t loc = 0; + size_t len = strlen(symbol); + char *buf = NULL; + /* + * Rust symbols always start with _R (v0) or _ZN (legacy) + */ + const char *mangled_rust[] = { + "_R", + "_ZN", + NULL + }; + + if (!out || out_size < len) + return 0; + + for (i = 0; mangled_rust[i]; i++) { + size_t sz = strlen(mangled_rust[i]); + char *p = memmem(symbol, len, mangled_rust[i], sz); + if (p) { + loc = p - symbol; + if (loc) + memcpy(out, symbol, loc); + break; + } + } + + buf = rust_demangle(symbol + loc, DMGL_RUST); + if (buf) { + memcpy(out + loc, buf, strlen(buf));

+ free(buf); + return 1; + } else if (loc != 0) + memset(out, 0, loc); + + return 0; +} + static int namespace_ctl(int cmd, struct symbol_namespace *ns, void *nsarg1, void *nsarg2) { @@ -3315,9 +3355,14 @@ namespace_ctl(int cmd, struct symbol_namespace *ns, void *nsarg1, void *nsarg2) return TRUE; case NAMESPACE_INSTALL: + char demangled[BUFSIZE] = {0}; sp = (struct syment *)nsarg1; name = (char *)nsarg2; len = strlen(name)+1; + if (rust_demangle_symbol(name, demangled, sizeof(demangled))) { + len = strlen(demangled) + 1; + name = demangled; + } if ((ns->index + len) >= ns->size) { if (!(addr = realloc(ns->address, ns->size*2))) error(FATAL, "symbol name space malloc: %s\n", -- 2.50.1 -- Crash-utility mailing list -- devel(a)lists.crash-utility.osci.io To unsubscribe send an email to devel-leave(a)lists.crash-utility.osci.io https://${domain_name}/admin/lists/devel.lists.crash-utility.osci.io/ Contribution Guidelines: https://github.com/crash-utility/crash/wiki