git: dfe7186f287f - stable/12 - readelf: add Go Build ID ELF note support

The branch stable/12 has been updated by emaste:

URL: https://cgit.FreeBSD.org/src/commit/?id=dfe7186f287fcdfa2dbd5b3b9eadcc0c3052148f

commit dfe7186f287fcdfa2dbd5b3b9eadcc0c3052148f
Author:     Ed Maste <emaste@FreeBSD.org>
AuthorDate: 2021-12-10 20:11:45 +0000
Commit:     Ed Maste <emaste@FreeBSD.org>
CommitDate: 2022-01-05 02:04:37 +0000

    readelf: add Go Build ID ELF note support
    
    Reviewed by:    markj
    MFC after:      1 week
    Differential Revision:  https://reviews.freebsd.org/D33379
    
    (cherry picked from commit ca457394fccfc7d712cd9cc6a66e574767a0a32b)
---
 contrib/elftoolchain/readelf/readelf.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/contrib/elftoolchain/readelf/readelf.c b/contrib/elftoolchain/readelf/readelf.c
index a647f2e7961d..f07fca31f4fe 100644
--- a/contrib/elftoolchain/readelf/readelf.c
+++ b/contrib/elftoolchain/readelf/readelf.c
@@ -362,8 +362,9 @@ static const char *note_type(const char *note_name, unsigned int et,
     unsigned int nt);
 static const char *note_type_freebsd(unsigned int nt);
 static const char *note_type_freebsd_core(unsigned int nt);
-static const char *note_type_linux_core(unsigned int nt);
+static const char *note_type_go(unsigned int nt);
 static const char *note_type_gnu(unsigned int nt);
+static const char *note_type_linux_core(unsigned int nt);
 static const char *note_type_netbsd(unsigned int nt);
 static const char *note_type_openbsd(unsigned int nt);
 static const char *note_type_unknown(unsigned int nt);
@@ -1140,6 +1141,8 @@ note_type(const char *name, unsigned int et, unsigned int nt)
 			return note_type_freebsd(nt);
 	else if (strcmp(name, "GNU") == 0 && et != ET_CORE)
 		return note_type_gnu(nt);
+	else if (strcmp(name, "Go") == 0 && et != ET_CORE)
+		return note_type_go(nt);
 	else if (strcmp(name, "NetBSD") == 0 && et != ET_CORE)
 		return note_type_netbsd(nt);
 	else if (strcmp(name, "OpenBSD") == 0 && et != ET_CORE)
@@ -1232,6 +1235,15 @@ note_type_gnu(unsigned int nt)
 	}
 }
 
+static const char *
+note_type_go(unsigned int nt)
+{
+	switch (nt) {
+	case 4: return "elfGoBuildIDTag";
+	default: return (note_type_unknown(nt));
+	}
+}
+
 static const char *
 note_type_netbsd(unsigned int nt)
 {
@@ -3749,6 +3761,16 @@ dump_notes_data(struct readelf *re, const char *name, uint32_t type,
 			dump_flags(note_feature_ctl_flags, ubuf[0]);
 			return;
 		}
+	} else if (strcmp(name, "Go") == 0) {
+		if (type == 4) {
+			printf("   Build ID: ");
+			for (i = 0; i < sz; i++) {
+				printf(isprint(buf[i]) ? "%c" : "<%02x>",
+				    buf[i]);
+			}
+			printf("\n");
+			return;
+		}
 	} else if (strcmp(name, "GNU") == 0) {
 		switch (type) {
 		case NT_GNU_PROPERTY_TYPE_0: