http://sourceware.org/bugzilla/show_bug.cgi?id=15649
Bug ID: 15649
Summary: ARM - Invalid constant after fixup with shifted
immediate values
Product: binutils
Version: 2.23
Status: NEW
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: m.lesniewski at samsung dot com
The ARM data processing instructions (e.g. add, mov, and, etc.) accept
immediate operators. The immediate values can be 8-bit values rotated by any
even number of bits in the range 0-30. For example, it is possible to use
immediate values like 0xab, 0xab000000 and 0x00ab, but not 0xa000b000.
gas accepts immediate operands in two forms:
insn rd, rm, imm, rot @ rd := insn(rm, rot32(imm8, rot4))
insn rd, rm, imm @ rd := insn(rm, imm)
In the first case, the base value (imm) and the rotation are given explicitly.
In the second case, these values are calculated by gas.
I found out that when using the second syntax, gas reports an error saying
"invalid constant (...) after fixup" when some valid immediate values are
given.
Example instruction:
add r0, r1, #0xf000000f
Equivalent instruction (which is handled correctly):
add r0, r1, #0xff, #4
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