http://sourceware.org/bugzilla/show_bug.cgi?id=12269
Summary: unknown-z80-coff: Incorrect assembly of indexed
register offsets from equ declarations
Product: binutils
Version: unspecified
Status: NEW
Severity: critical
Priority: P2
Component: gas
AssignedTo: unassig...@sources.redhat.com
ReportedBy: chris.smit...@googlemail.com
For the target unknown-z80-coff, Indexed register offsets are incorrectly
assembled as zero if they reference an equ declarations that has yet to be
made. Providing the equ declaration first in the file produces the correct
offset.
This produces incorrect executables from correct Z80 source.
Other uses of the equ value appear to assemble correctly (LD A, offsetAtEnd for
example below).
Example code and dump illustrating the problem:
-------------------------------------------------------------------------
begin:
offsetAtStart: equ 32
LD A, offsetAtStart
LD A, (IX + offsetAtStart)
LD A, offsetAtEnd
LD A, (IX + offsetAtEnd)
RET
offsetAtEnd: equ 64
END
This produces the following (note the 00 offset at line 10 - should be 0x40 as
in line 9)
1 begin:
2
3 offsetAtStart: equ 32
5
6 0000 3E20 LD A, offsetAtStart
7 0002 DD7E 20 LD A, (IX + offsetAtStart)
8
9 0005 3E40 LD A, offsetAtEnd
10 0007 DD7E 00 LD A, (IX + offsetAtEnd)
11
12 000a C9 RET
13
14 offsetAtEnd: equ 64
--
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