[PATCH] gas, x86: add -mno-plt32 option to disable PLT32 relocations
Todor Buyukliev
tbuyukliev@vmware.com
Wed Oct 20 09:58:54 GMT 2021
hi all,
here’s a patch that we need. it’s against 2.34. can it be merged to master?
regards,
todor
[PATCH] gas, x86: add -mno-plt32 option to disable PLT32 relocations
---
gas/ChangeLog | 9 +++++++++
gas/config/tc-i386.c | 15 +++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/gas/ChangeLog b/gas/ChangeLog
index ac92d076ef9..f70c8d45db9 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,12 @@
+2021-05-28 Todor Buyukliev <tbuyukliev@vmware.com>
+
+ * config/t-i386.c (disable_plt32): New declaration.
+ (md_show_usage): Add -mno-plt32.
+ (need_plt32_p): Return false if disable_plt32 is set.
+ (OPTION_MNO_PLT32): New define.
+ (md_longopts): Support mno-plt32 option.
+ (md_parse_option): Likewise.
+
2020-02-10 H.J. Lu <hongjiu.lu@intel.com>
PR gas/25516
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index 3f1d4cab7e5..1af97c0d149 100644
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -592,6 +592,9 @@ static int use_big_obj = 0;
#if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)
/* 1 if generating code for a shared library. */
static int shared = 0;
+
+/* Non-zero to disable PLT32 relocations. */
+static int disable_plt32 = 0;
#endif
/* 1 for intel syntax,
@@ -7991,6 +7994,10 @@ need_plt32_p (symbolS *s)
return FALSE;
#endif
+ /* Don't emit PLT32 relocation if asked to. */
+ if (disable_plt32)
+ return FALSE;
+
/* Since there is no need to prepare for PLT branch on x86-64, we
can generate R_X86_64_PLT32, instead of R_X86_64_PC32, which can
be used as a marker for 32-bit PC-relative branches. */
@@ -12051,6 +12058,7 @@ const char *md_shortopts = "qnO::";
#define OPTION_MALIGN_BRANCH_PREFIX_SIZE (OPTION_MD_BASE + 28)
#define OPTION_MALIGN_BRANCH (OPTION_MD_BASE + 29)
#define OPTION_MBRANCHES_WITH_32B_BOUNDARIES (OPTION_MD_BASE + 30)
+#define OPTION_MNO_PLT32 (OPTION_MD_BASE + 31)
struct option md_longopts[] =
{
@@ -12063,6 +12071,7 @@ struct option md_longopts[] =
{"x32", no_argument, NULL, OPTION_X32},
{"mshared", no_argument, NULL, OPTION_MSHARED},
{"mx86-used-note", required_argument, NULL, OPTION_X86_USED_NOTE},
+ {"mno-plt32", no_argument, NULL, OPTION_MNO_PLT32},
#endif
{"divide", no_argument, NULL, OPTION_DIVIDE},
{"march", required_argument, NULL, OPTION_MARCH},
@@ -12193,6 +12202,10 @@ md_parse_option (int c, const char *arg)
else
as_fatal (_("32bit x86_64 is only supported for ELF"));
break;
+
+ case OPTION_MNO_PLT32:
+ disable_plt32 = 1;
+ break;
#endif
case OPTION_32:
@@ -12791,6 +12804,8 @@ md_show_usage (FILE *stream)
fprintf (stream, _("(default: no)\n"));
fprintf (stream, _("\
generate x86 used ISA and feature properties\n"));
+ fprintf (stream, _("\
+ -mno-plt32 don't generate PLT32 relocations\n"));
#endif
#if defined (TE_PE) || defined (TE_PEP)
fprintf (stream, _("\
--
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