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| author | Jens Remus <jremus@linux.ibm.com> | 2024-03-01 12:45:14 +0100 |
|---|---|---|
| committer | Jens Remus <jremus@linux.ibm.com> | 2024-03-01 12:45:14 +0100 |
| commit | 75a28d1a97ace81c8481fd1c85d21e6f22e68924 (patch) | |
| tree | ad764109e3f3fa1a0228078d50c6e35210589286 /binutils | |
| parent | dfa4ac9728ce8999a9b53d1ef37b175380940ee5 (diff) | |
| download | gdb-75a28d1a97ace81c8481fd1c85d21e6f22e68924.zip gdb-75a28d1a97ace81c8481fd1c85d21e6f22e68924.tar.gz gdb-75a28d1a97ace81c8481fd1c85d21e6f22e68924.tar.bz2 | |
s390: Print base register 0 as "0" in disassembly
Base and index register 0 have no effect in address computation:
"A value of zero in the B [base] or X [index] field specifies that no
base or index is to be applied, and, thus, general register 0 cannot be
designated as containing a base address or index."
IBM z/Architecture Principles of Operation [1], chapter "Organization",
section "General Registers".
Index register 0 is omitted in the s390 disassembly. Base register 0 is
omitted in D(B), D(L,B) and D(X,B) - the latter only if the index
register is zero.
To make it more apparent print base register 0 as "0" instead of "%r0",
whenever it would still be printed in the disassembly.
[1]: IBM z/Architecture Principles of Operation, SA22-7832-13,
https://publibfp.dhe.ibm.com/epubs/pdf/a227832d.pdf
opcodes/
* s390-dis.c: Print base register 0 as "0" in disassembly.
binutils/
* NEWS: Mention base register 0 now being printed as "0" in s390
disassembly.
gas/
* testsuite/gas/s390/zarch-base-index-0.d: Update test case
output verification patterns to accept "0" as base base
register due to disassembler output format change.
* gas/testsuite/gas/s390/zarch-omitted-base-index.d: Likewise.
Reviewed-by: Andreas Krebbel <krebbel@linux.ibm.com>
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Diffstat (limited to 'binutils')
| -rw-r--r-- | binutils/NEWS | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/binutils/NEWS b/binutils/NEWS index 7b7ac1c..9c7c8f1 100644 --- a/binutils/NEWS +++ b/binutils/NEWS @@ -1,5 +1,7 @@ -*- text -*- +* Base register 0 is now printed as "0" instead of "%r0" in s390 disassembly. + * When objdump or readelf are used to display the contents of a .eh_frame section they will now also display the contents of the .eh_frame_hdr section, if present. |