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authorJozef Lawrynowicz <jozef.l@mittosystems.com>2020-09-08 16:13:48 +0100
committerJozef Lawrynowicz <jozef.l@mittosystems.com>2020-09-08 16:18:38 +0100
commit7d81bc937cd3949fc3bed8194646d3a4563f94b2 (patch)
tree6d1300169968fa3dae4c85e0c633f27ed61cb5ca /bfd/bfd-in2.h
parentf1363b0fb4eb8bbe9ef08f1e78ff6ffa71e07b8b (diff)
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MSP430: Support relocations for subtract expressions in .uleb128 directives
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.
Diffstat (limited to 'bfd/bfd-in2.h')
-rw-r--r--bfd/bfd-in2.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index 2202cab..935ba53 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -5114,6 +5114,8 @@ then it may be truncated to 8 bits. */
BFD_RELOC_MSP430_ABS_HI16,
BFD_RELOC_MSP430_PREL31,
BFD_RELOC_MSP430_SYM_DIFF,
+ BFD_RELOC_MSP430_SET_ULEB128,
+ BFD_RELOC_MSP430_SUB_ULEB128,
/* Relocations used by the Altera Nios II core. */
BFD_RELOC_NIOS2_S16,