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102 lines
3.7 KiB
Diff
102 lines
3.7 KiB
Diff
From de122af5382d8017cae63bdee946206c6c6c23ab Mon Sep 17 00:00:00 2001
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From: Jan Tojnar <jtojnar@gmail.com>
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Date: Sat, 24 Dec 2022 20:19:27 +0100
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Subject: [PATCH 3/4] libbacktrace: Support multiple build id directories
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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gdb supports multiple debug directories separated by colons:
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https://github.com/bminor/binutils-gdb/blob/fcbfb25dcca625a7f999ec51d48b6fc3a32123c3/gdb/build-id.c#L136-L142
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This is useful for example when using dwarffs in addition
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to debug data installed using distribution’s package manager.
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---
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elf.c | 57 ++++++++++++++++++++++++++++++++++++---------------------
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1 file changed, 36 insertions(+), 21 deletions(-)
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diff --git a/elf.c b/elf.c
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index 8b1189c..65c647a 100644
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--- a/elf.c
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+++ b/elf.c
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@@ -865,12 +865,12 @@ elf_readlink (struct backtrace_state *state, const char *filename,
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when the build ID is known is in /usr/lib/debug/.build-id. */
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static int
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-elf_open_debugfile_by_buildid (struct backtrace_state *state,
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+elf_open_debugfile_by_buildid (const char * const prefix,
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+ struct backtrace_state *state,
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const char *buildid_data, size_t buildid_size,
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backtrace_error_callback error_callback,
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void *data)
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{
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- const char * const prefix = SYSTEM_DEBUG_DIR BUILD_ID_DIR;
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const size_t prefix_len = strlen (prefix);
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const char * const suffix = ".debug";
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const size_t suffix_len = strlen (suffix);
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@@ -6936,27 +6936,42 @@ elf_add (struct backtrace_state *state, const char *filename, int descriptor,
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if (buildid_data != NULL)
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{
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int d;
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+ char debug_directories[strlen(SYSTEM_DEBUG_DIR) + 1];
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+ char *debug_dir;
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- d = elf_open_debugfile_by_buildid (state, buildid_data, buildid_size,
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- error_callback, data);
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- if (d >= 0)
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- {
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- int ret;
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+ strcpy(debug_directories, SYSTEM_DEBUG_DIR);
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- elf_release_view (state, &buildid_view, error_callback, data);
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- if (debuglink_view_valid)
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- elf_release_view (state, &debuglink_view, error_callback, data);
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- if (debugaltlink_view_valid)
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- elf_release_view (state, &debugaltlink_view, error_callback, data);
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- ret = elf_add (state, "", d, NULL, 0, base_address, error_callback,
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- data, fileline_fn, found_sym, found_dwarf, NULL, 0,
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- 1, NULL, 0);
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- if (ret < 0)
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- backtrace_close (d, error_callback, data);
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- else if (descriptor >= 0)
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- backtrace_close (descriptor, error_callback, data);
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- return ret;
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- }
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+ debug_dir = strtok (debug_directories, ":");
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+ while (debug_dir != NULL)
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+ {
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+ char prefix[strlen(debug_dir) + strlen(BUILD_ID_DIR) + 1];
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+ strcpy(prefix, debug_dir);
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+ strcat(prefix, BUILD_ID_DIR);
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+
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+ d = elf_open_debugfile_by_buildid (prefix, state, buildid_data, buildid_size,
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+ error_callback, data);
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+
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+ if (d >= 0)
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+ {
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+ int ret;
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+
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+ elf_release_view (state, &buildid_view, error_callback, data);
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+ if (debuglink_view_valid)
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+ elf_release_view (state, &debuglink_view, error_callback, data);
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+ if (debugaltlink_view_valid)
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+ elf_release_view (state, &debugaltlink_view, error_callback, data);
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+ ret = elf_add (state, "", d, NULL, 0, base_address, error_callback,
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+ data, fileline_fn, found_sym, found_dwarf, NULL, 0,
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+ 1, NULL, 0);
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+ if (ret < 0)
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+ backtrace_close (d, error_callback, data);
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+ else if (descriptor >= 0)
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+ backtrace_close (descriptor, error_callback, data);
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+ return ret;
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+ }
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+
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+ debug_dir = strtok (NULL, ":");
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+ }
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}
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if (buildid_view_valid)
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--
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2.38.1
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