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authorH.J. Lu <hjl.tools@gmail.com>2015-10-22 04:53:04 -0700
committerH.J. Lu <hjl.tools@gmail.com>2015-10-22 04:56:39 -0700
commitcaa65211bbbfd53c40c9ce1b79b97ccf2c679a52 (patch)
treefb1a002a3550e25bdfa5c224a52d4a5fd7fab63b /include
parent56ceb5b5405af23eddd12e12d8ba849010120324 (diff)
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Add "-z call-nop=PADDING" option to ld
The ld linker can transform indirect call to a locally defined function, foo, via its GOT slot, to either "NOP call foo" or "call foo NOP" where NOP is a 1-byte NOP padding. This patch adds a "-z call-nop=PADDING" option to x86 ld to control 1-byte NOP padding for x86 call instruction. PADDING is one of prefix-addr, prefix-nop, suffix-nop, prefix-NUMBER or suffix-NUMBER. bfd/ * elf32-i386.c (elf_i386_convert_load): Use call_nop_byte and check call_nop_as_suffix for 1-byte NOP padding to pad call. * elf64-x86-64.c (elf_x86_64_convert_load): Likewise. include/ * bfdlink.h (bfd_link_info): Add call_nop_as_suffix and call_nop_byte. ld/ * ld/ld.texinfo: Document "-z call-nop=PADDING" option. * emulparams/call_nop.sh: New file. * emulparams/elf_i386_be.sh: Source ${srcdir}/emulparams/call_nop.sh. * emulparams/elf_i386_chaos.sh: Likewise. * emulparams/elf_i386_ldso.sh: Likewise. * emulparams/elf_i386_vxworks.sh: Likewise. * emulparams/elf_iamcu.sh: Likewise. * emulparams/elf_k1om.sh: Likewise. * emulparams/elf_l1om.sh: Likewise. * emulparams/elf_x86_64.sh: Likewise. * emultempl/elf32.em (gld${EMULATION_NAME}_before_parse): Set link_info.call_nop_byte if $CALL_NOP_BYTE isn't empty. ld/testsuite/ * ld-i386/call3.s: New file. * ld-i386/call3a.d: Likewise. * ld-i386/call3b.d: Likewise. * ld-i386/call3c.d: Likewise. * ld-i386/call3d.d: Likewise. * ld-i386/call3e.d: Likewise. * ld-i386/call3f.d: Likewise. * ld-i386/call3g.d: Likewise. * ld-i386/call3h.d: Likewise. * ld-i386/load1-nacl.d: Likewise. * ld-x86-64/call1.s: Likewise. * ld-x86-64/call1a.d: Likewise. * ld-x86-64/call1b.d: Likewise. * ld-x86-64/call1c.d: Likewise. * ld-x86-64/call1d.d: Likewise. * ld-x86-64/call1e.d: Likewise. * ld-x86-64/call1f.d: Likewise. * ld-x86-64/call1g.d: Likewise. * ld-x86-64/call1h.d: Likewise. * ld-x86-64/call1i.d: Likewise. * ld-x86-64/load1a-nacl.d: Likewise. * ld-x86-64/load1b-nacl.d: Likewise. * ld-x86-64/load1c-nacl.d: Likewise. * ld-x86-64/load1d-nacl.d: Likewise.
Diffstat (limited to 'include')
-rw-r--r--include/ChangeLog5
-rw-r--r--include/bfdlink.h6
2 files changed, 11 insertions, 0 deletions
diff --git a/include/ChangeLog b/include/ChangeLog
index 5301696..c6b8f0b 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,8 @@
+2015-10-22 H.J. Lu <hongjiu.lu@intel.com>
+
+ * bfdlink.h (bfd_link_info): Add call_nop_as_suffix and
+ call_nop_byte.
+
2015-10-07 Claudiu Zissulescu <claziss@synopsys.com>
* dis-asm.h (arc_get_disassembler): Correct declaration.
diff --git a/include/bfdlink.h b/include/bfdlink.h
index 2ffb3d1..93abab1 100644
--- a/include/bfdlink.h
+++ b/include/bfdlink.h
@@ -434,6 +434,12 @@ struct bfd_link_info
/* TRUE if generation of .interp/PT_INTERP should be suppressed. */
unsigned int nointerp: 1;
+ /* TRUE if generate a 1-byte NOP as suffix for x86 call instruction. */
+ unsigned int call_nop_as_suffix : 1;
+
+ /* The 1-byte NOP for x86 call instruction. */
+ char call_nop_byte;
+
/* Char that may appear as the first char of a symbol, but should be
skipped (like symbol_leading_char) when looking up symbols in
wrap_hash. Used by PowerPC Linux for 'dot' symbols. */