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ed
2026-08-02 21:58:57 -04:00
parent 858e57f293
commit 9eb696ece8
4 changed files with 175 additions and 15 deletions
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code/duffle/lottes_tape.h
+4 -10
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@@ -81,18 +81,12 @@ atom_dbg_skip MipsAtom_(tape_exit) { jump_reg(rret_addr), nop };
//TODO(Ed): Do we backup R_S0-7 here? Have it in a heavier tape run as a opt-in? Same with V0-1 and A0-3?
/* Generalized Tape Engine Runner */
FI_ void tape_run(Slice_MipsCode tape) { register U4* tape_ptr rgcc(R_TapePtr) = u4_r(tape.ptr); asm volatile(
// Removed, not needed
/*add_ui( R_SP, R_SP, -MipsStackAlignment)*/ /* Allocate stack space */
/*, store_word( R_RA, R_SP, 0)*/ /* Safely backup $ra to the stack */
asm_words(
load_word( R_AtomJmp, R_TapePtr, 0) /* Bootstrap the first jump */
, add_ui_self(R_TapePtr, S_(MipsCode)) /* Advance tape */
, call_reg( R_AtomJmp) /* jalr $t9 */
, nop /* Branch delay slot */
load_word( R_AtomJmp, R_TapePtr, 0) /* Bootstrap the first jump */
, add_ui_self(R_TapePtr, S_(MipsCode)) /* Advance tape */
, call_reg( R_AtomJmp) /* jalr $t9 */
, nop /* Branch delay slot */
)
// Removed, not needed
/*, load_word( R_RA, R_SP, 0)* /* Restore $ra from stack */
/*, add_ui_self(R_SP, MipsStackAlignment)*/ /* Deallocate stack space */
asm_rpins, r_use(tape_ptr)
asm_clobber:
rlit(R_AT)