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[binutils-gdb] RISC-V/GAS: Improve handling of invalid relocs
- From: Palmer Dabbelt <palmer at sourceware dot org>
- To: bfd-cvs at sourceware dot org
- Date: 9 Jan 2017 17:21:34 -0000
- Subject: [binutils-gdb] RISC-V/GAS: Improve handling of invalid relocs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=e294484ee7e8dea53d091443a0f24c7939ac15ed
commit e294484ee7e8dea53d091443a0f24c7939ac15ed
Author: Andrew Waterman <andrew@sifive.com>
Date: Wed Dec 21 12:47:13 2016 -0800
RISC-V/GAS: Improve handling of invalid relocs
TLS relocs against constants previously segfaulted, and illegal
symbol subtractions were silently ignored.
The previous behavior was to segfault.
gas/ChangeLog
2017-01-09 Andrew Waterman <andrew@sifive.com>
* config/tc-riscv.c (md_apply_fix): Report TLS relocations against
constants. Report disallowed symbol subtractions.
Diff:
---
gas/ChangeLog | 6 ++++++
gas/config/tc-riscv.c | 10 +++++++++-
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/gas/ChangeLog b/gas/ChangeLog
index 88f68a1..4de9cf7 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,9 @@
+2017-01-09 Andrew Waterman <andrew@sifive.com>
+
+ * config/tc-riscv.c (append_insn): Don't eagerly apply relocations
+ against constants.
+ (md_apply_fix): Mark relocations against constants as "done."
+
2017-01-09 Palmer Dabbelt <palmer@dabbelt.com>
Kito Cheng <kito.cheng@gmail.com>
diff --git a/gas/config/tc-riscv.c b/gas/config/tc-riscv.c
index b8da6ce..3f09101 100644
--- a/gas/config/tc-riscv.c
+++ b/gas/config/tc-riscv.c
@@ -1889,7 +1889,11 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
case BFD_RELOC_RISCV_TLS_GD_HI20:
case BFD_RELOC_RISCV_TLS_DTPREL32:
case BFD_RELOC_RISCV_TLS_DTPREL64:
- S_SET_THREAD_LOCAL (fixP->fx_addsy);
+ if (fixP->fx_addsy != NULL)
+ S_SET_THREAD_LOCAL (fixP->fx_addsy);
+ else
+ as_bad_where (fixP->fx_file, fixP->fx_line,
+ _("TLS relocation against a constant"));
break;
case BFD_RELOC_64:
@@ -2045,6 +2049,10 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
as_fatal (_("internal error: bad relocation #%d"), fixP->fx_r_type);
}
+ if (fixP->fx_subsy != NULL)
+ as_bad_where (fixP->fx_file, fixP->fx_line,
+ _("unsupported symbol subtraction"));
+
/* Add an R_RISCV_RELAX reloc if the reloc is relaxable. */
if (relaxable && fixP->fx_tcbit && fixP->fx_addsy != NULL)
{