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7d81bc937c
Link-time relaxations of branches are common for MSP430, given that GCC
can generate pessimal branch instructions, and the
-mcode-region=either/-mdata-region=either options to shuffle sections
can further change the type of branch instruction required.
These relaxations can result in invalid code when .uleb128
directives, used in the .gcc_except_table section, are used to calculate
the distance between two labels. A value for the .uleb128 directive is
calculated at assembly-time, and can't be updated at link-time, even if
relaxation causes the distance between the labels to change.
This patch adds relocations for subtract expressions in .uleb128
directives, to allow the linker to re-calculate the value of these
expressions after relaxation has been performed.
bfd/ChangeLog:
* bfd-in2.h (bfd_reloc_code_real): Add
BFD_RELOC_MSP430_{SET,SUB}_ULEB128.
* elf32-msp430.c (msp430_elf_ignore_reloc): New.
(elf_msp430_howto_table): Add R_MSP430{,X}_GNU_{SET,SUB}_ULEB128.
(msp430_reloc_map): Add R_MSP430_GNU_{SET,SUB}_ULEB128.
(msp430x_reloc_map): Add R_MSP430X_GNU_{SET,SUB}_ULEB128.
(write_uleb128): New.
(msp430_final_link_relocate): Handle R_MSP430{,X}_GNU_{SET,SUB}_ULEB128.
* libbfd.c (_bfd_write_unsigned_leb128): New.
* libbfd.h (_bfd_write_unsigned_leb128): New prototype.
Add BFD_RELOC_MSP430_{SET,SUB}_ULEB128.
* reloc.c: Document BFD_RELOC_MSP430_{SET,SUB}_ULEB128.
binutils/ChangeLog:
* readelf.c (target_specific_reloc_handling): Handle
R_MSP430{,X}_GNU_{SET,SUB}_ULEB128.
gas/ChangeLog:
* config/tc-msp430.c (msp430_insert_uleb128_fixes): New.
(msp430_md_end): Call msp430_insert_uleb128_fixes.
include/ChangeLog:
* elf/msp430.h (elf_msp430_reloc_type): Add
R_MSP430_GNU_{SET,SUB}_ULEB128.
(elf_msp430x_reloc_type): Add R_MSP430X_GNU_{SET,SUB}_ULEB128.
ld/ChangeLog:
* testsuite/ld-msp430-elf/msp430-elf.exp: Run new tests.
* testsuite/ld-msp430-elf/uleb128.s: New test.
* testsuite/ld-msp430-elf/uleb128_430.d: New test.
* testsuite/ld-msp430-elf/uleb128_430x.d: New test.
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| .. | ||
| config | ||
| ld-aarch64 | ||
| ld-alpha | ||
| ld-arc | ||
| ld-arm | ||
| ld-auto-import | ||
| ld-avr | ||
| ld-bootstrap | ||
| ld-bpf | ||
| ld-cdtest | ||
| ld-checks | ||
| ld-cris | ||
| ld-crx | ||
| ld-csky | ||
| ld-ctf | ||
| ld-cygwin | ||
| ld-d10v | ||
| ld-discard | ||
| ld-dynamic | ||
| ld-elf | ||
| ld-elfcomm | ||
| ld-elfvers | ||
| ld-elfvsb | ||
| ld-elfweak | ||
| ld-fastcall | ||
| ld-frv | ||
| ld-gc | ||
| ld-h8300 | ||
| ld-i386 | ||
| ld-ia64 | ||
| ld-ifunc | ||
| ld-libs | ||
| ld-linkonce | ||
| ld-m68hc11 | ||
| ld-m68k | ||
| ld-mep | ||
| ld-metag | ||
| ld-mips-elf | ||
| ld-misc | ||
| ld-mmix | ||
| ld-mn10300 | ||
| ld-msp430-elf | ||
| ld-nds32 | ||
| ld-nios2 | ||
| ld-or1k | ||
| ld-pdp11 | ||
| ld-pe | ||
| ld-pie | ||
| ld-plugin | ||
| ld-powerpc | ||
| ld-pru | ||
| ld-riscv-elf | ||
| ld-s12z | ||
| ld-s390 | ||
| ld-scripts | ||
| ld-selective | ||
| ld-sh | ||
| ld-shared | ||
| ld-size | ||
| ld-sparc | ||
| ld-spu | ||
| ld-srec | ||
| ld-tic6x | ||
| ld-tilegx | ||
| ld-tilepro | ||
| ld-undefined | ||
| ld-unique | ||
| ld-v850 | ||
| ld-vax-elf | ||
| ld-visium | ||
| ld-vxworks | ||
| ld-x86-64 | ||
| ld-xc16x | ||
| ld-xstormy16 | ||
| ld-xtensa | ||
| ld-z8k | ||
| ld-z80 | ||
| lib | ||
| ChangeLog-2004 | ||
| ChangeLog-2005 | ||
| ChangeLog-2006 | ||
| ChangeLog-2007 | ||
| ChangeLog-2008 | ||
| ChangeLog-2009 | ||
| ChangeLog-2010 | ||
| ChangeLog-2011 | ||
| ChangeLog-2012 | ||
| ChangeLog-2013 | ||
| ChangeLog-2014 | ||
| ChangeLog-2015 | ||
| ChangeLog-9303 | ||