[PATCH] debugedit: add MIPS support

["Dmitry V. Levin" <ldv@altlinux.org>]

From: "Ivan A. Melnikov" <iv@altlinux.org>
Date: Fri, 13 Nov 2020 15:51:08 +0400

According to the specification[1], all MIPS .debug_* sections are
marked with ELF type SHT_MIPS_DWARF.  The format of the section
data stays the same, so we have can handle e.g. .debug_info
section as we used to.

As SHT_MIPS_DWARF is from processor-specific range, we have to check
that we're actually dealing with MIPS ELF file before handling such
sections.

[1] MIPS Extensions to DWARF Version 2.0. -- Silicon Graphics
    Computer Systems, rev 1.17, 29 Aug 2001

Refs: https://bugzilla.altlinux.org/39284
Signed-off-by: Ivan A. Melnikov <iv@altlinux.org>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
---
 tools/debugedit.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/debugedit.c b/tools/debugedit.c
index 7c57e16..917c59b 100644
--- a/tools/debugedit.c
+++ b/tools/debugedit.c
@@ -3440,6 +3440,16 @@ main (int argc, char *argv[])
 
       switch (dso->shdr[i].sh_type)
 	{
+	case SHT_MIPS_DWARF:
+	  /* According to the specification, all MIPS .debug_* sections are
+	     marked with ELF type SHT_MIPS_DWARF. As SHT_MIPS_DWARF is from
+	     processor-specific range, we have to check that we're actually
+	     dealing with MIPS ELF file before handling such sections.  */
+	  if (dso->ehdr.e_machine != EM_MIPS
+	      && dso->ehdr.e_machine != EM_MIPS_RS3_LE) {
+	    break;
+	  }
+	  /*@fallthrough@*/
 	case SHT_PROGBITS:
 	  name = strptr (dso, dso->ehdr.e_shstrndx, dso->shdr[i].sh_name);
 	  /* TODO: Handle stabs */
-- 
ldv