diff options
| author | David Boddie <david@boddie.org.uk> | 2023-04-02 18:24:31 +0200 |
|---|---|---|
| committer | David Boddie <david@boddie.org.uk> | 2023-11-16 16:44:28 +0100 |
| commit | d8023f9f90be42752d6f61a1a436444f0cfad288 (patch) | |
| tree | f40607083e1f9b66e779eca5df53e871c790c379 /utils/tl/thumb.c | |
| parent | da381efbb790e33a14f8ff1c041a2ce5be315924 (diff) | |
Imposed limitations on supported instruction encodings.
Diffstat (limited to 'utils/tl/thumb.c')
| -rw-r--r-- | utils/tl/thumb.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/utils/tl/thumb.c b/utils/tl/thumb.c index f91b9d64..ff089918 100644 --- a/utils/tl/thumb.c +++ b/utils/tl/thumb.c @@ -1407,9 +1407,24 @@ if(debug['G']) print("%ulx: %s: thumb\n", (ulong)(p->pc), p->from.sym->name); diag("not implemented: %A", p->as); break; } - o1 |= r | (rt<<24) | ((instoffset & 0xff)<<16) | - ((instoffset & 0x700) << 20) | - ((instoffset & 0x800) >> 1); + + /* Only certain ranges of constants are supported. */ + if ((instoffset & 0xff) == instoffset) { + o1 |= r | (rt<<24) | (instoffset << 16); + } else if (((instoffset & 0xff00ff) == instoffset) && + ((instoffset & 0xff) == ((instoffset >> 16) & 0xff))) { + o1 |= r | (rt<<24) | ((instoffset & 0xff) << 16) | (1 << 28); + } else if (((instoffset & 0xff00ff00) == instoffset) && + (((instoffset >> 8) & 0xff) == ((instoffset >> 24) & 0xff))) { + o1 |= r | (rt<<24) | ((instoffset & 0xff) << 16) | (2 << 28); + } else if (((instoffset & 0xff) == ((instoffset >> 8) & 0xff)) && + ((instoffset & 0xff) == ((instoffset >> 16) & 0xff)) && + ((instoffset & 0xff) == ((instoffset >> 24) & 0xff))) { + o1 |= r | (rt<<24) | ((instoffset & 0xff) << 16) | (3 << 28); + } else { + print("%A %d %d %d\n", p->as, instoffset, p->reg, p->to.reg); + diag("constant not supported: %ux", instoffset); + } SPLIT_INS(o1, o2); break; |