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| author | Maciej W. Rozycki <macro@redhat.com> | 2024-07-19 09:42:56 +0100 |
|---|---|---|
| committer | Maciej W. Rozycki <macro@redhat.com> | 2024-07-19 09:42:56 +0100 |
| commit | 875ac09b1217981fcd8d72908f45ecd9540fe8b5 (patch) | |
| tree | e598634538e908e65ca5dc97ce67caf6da4cb0dc /gas/NEWS | |
| parent | 5dd9c473f6bf04f12ec93182ccfa165e962e3500 (diff) | |
| download | gdb-875ac09b1217981fcd8d72908f45ecd9540fe8b5.zip gdb-875ac09b1217981fcd8d72908f45ecd9540fe8b5.tar.gz gdb-875ac09b1217981fcd8d72908f45ecd9540fe8b5.tar.bz2 | |
MIPS/GAS: Handle --trap command-line option dynamically
We have an ISA check for the '--trap' command-line option that reports
its incompatibility with the MIPS I architecture. It doesn't prevent
trap instructions from being enabled though, so when attempt is made to
emit one in an expansion of one of the division or multiplication macros
an assertion failure triggers:
.../gas/testsuite/gas/mips/brtr-opt.s: Assembler messages:
.../gas/testsuite/gas/mips/brtr-opt.s:3: Error: trap exception not supported at ISA 1
.../gas/testsuite/gas/mips/brtr-opt.s:9: Warning: divide by zero
.../gas/testsuite/gas/mips/brtr-opt.s:9: Internal error in macro_build at .../gas/config/tc-mips.c:9064.
Please report this bug.
The same assertion failure triggers without an earlier error message
when the initial ISA is compatible with the '--trap', however at the
time an attempt is made to emit a trap instruction from a division or
multiplication macro the ISA has been changed by a '.set' pseudo-op to
an incompatible one.
With the way the situations are mishandled it seems unlikely that anyone
relies on the current semantics and a sane approach is to decide on the
fly according to the currently selected ISA as to whether to emit trap
or breakpoint instructions in the case where '--trap' has been used.
Change our code to do so then and clarify that in the manual, which is
not explicit about how '--trap' is handled with a changing ISA. Mention
the change in NEWS too since it's a applies to a user option.
Diffstat (limited to 'gas/NEWS')
| -rw-r--r-- | gas/NEWS | 7 |
1 files changed, 7 insertions, 0 deletions
@@ -1,5 +1,12 @@ -*- text -*- +* The MIPS '--trap' command-line option now causes GAS to dynamically + track the ISA setting as code is assembled and to emit either trap or + breakpoint instructions according to whether the currently selected ISA + permits the use of trap instructions or not. Previously the ISA was + only checked at startup and GAS bailed out if the initial ISA was + incompatible with the '--trap' option. + * Support CFCMOV feature in Intel APX. Now, APX_F is fully supportted. * Support CCMP and CTEST feature in Intel APX. |