make thumb will compile libluajit.a for thumb
make test will run dynasm tests
Tests dynasm code generation.
./dump.js dumps the test() function programmed in main.c for copying
make test runs the code
./disas.js XXXX XXXX disassembles a one or two-word command.
Dynasm compiles input into an "actions" list. This is a list of assembly instructions interspliced with commands for dynamic instructions and branches that get inserted during Pass 1-3.
/* Pass 0: Compile into actions list. */
$ dynasm instr.dasc
/* Pass 1: Store actions and args, link branches/labels, estimate offsets. */
/* Feed encoder with actions. Calls are generated by pre-processor. */
DASM_FDEF void dasm_put(Dst_DECL, int start, ...);
/* Pass 2: Link sections, shrink branches/aligns, fix label offsets. */
/* Link sections and return the resulting size. */
DASM_FDEF int dasm_link(Dst_DECL, size_t *szp);
/* Pass 3: Encode sections. */
/* Encode sections into buffer. */
int dasm_encode(Dst_DECL, void *buffer)So for example,
0xdd00 - Branch LE
0xffff indicates an action.
0x5002 indicates:
5 - DASM_REL_LG
0x5002 & 2047 = // 0000 0111 1111 1111
we then subtract 10 (starts chain for fwd rel)
so 2 is -8