1 files changed, 205 insertions, 0 deletions

diff --git a/src/lj_emit_mips.h b/src/lj_emit_mips.h
new file mode 100644
index 00000000..59f0640b
--- /dev/null
+++ b/src/lj_emit_mips.h
@@ -0,0 +1,205 @@
+/*
+** MIPS instruction emitter.
+** Copyright (C) 2005-2012 Mike Pall. See Copyright Notice in luajit.h
+*/
+
+/* -- Emit basic instructions --------------------------------------------- */
+
+static void emit_dst(ASMState *as, MIPSIns mi, Reg rd, Reg rs, Reg rt)
+{
+  *--as->mcp = mi | MIPSF_D(rd) | MIPSF_S(rs) | MIPSF_T(rt);
+}
+
+static void emit_dta(ASMState *as, MIPSIns mi, Reg rd, Reg rt, uint32_t a)
+{
+  *--as->mcp = mi | MIPSF_D(rd) | MIPSF_T(rt) | MIPSF_A(a);
+}
+
+#define emit_ds(as, mi, rd, rs)         emit_dst(as, (mi), (rd), (rs), 0)
+#define emit_tg(as, mi, rt, rg)         emit_dst(as, (mi), (rg)&31, 0, (rt))
+
+static void emit_tsi(ASMState *as, MIPSIns mi, Reg rt, Reg rs, int32_t i)
+{
+  *--as->mcp = mi | MIPSF_T(rt) | MIPSF_S(rs) | (i & 0xffff);
+}
+
+#define emit_ti(as, mi, rt, i)          emit_tsi(as, (mi), (rt), 0, (i))
+#define emit_hsi(as, mi, rh, rs, i)     emit_tsi(as, (mi), (rh) & 31, (rs), (i))
+
+static void emit_fgh(ASMState *as, MIPSIns mi, Reg rf, Reg rg, Reg rh)
+{
+  *--as->mcp = mi | MIPSF_F(rf&31) | MIPSF_G(rg&31) | MIPSF_H(rh&31);
+}
+
+#define emit_fg(as, mi, rf, rg)         emit_fgh(as, (mi), (rf), (rg), 0)
+
+static void emit_rotr(ASMState *as, Reg dest, Reg src, Reg tmp, uint32_t shift)
+{
+  if ((as->flags & JIT_F_MIPS32R2)) {
+    emit_dta(as, MIPSI_ROTR, dest, src, shift);
+  } else {
+    emit_dst(as, MIPSI_OR, dest, dest, tmp);
+    emit_dta(as, MIPSI_SLL, dest, src, (-shift)&31);
+    emit_dta(as, MIPSI_SRL, tmp, src, shift);
+  }
+}
+
+/* -- Emit loads/stores --------------------------------------------------- */
+
+/* Prefer rematerialization of BASE/L from global_State over spills. */
+#define emit_canremat(ref)      ((ref) <= REF_BASE)
+
+/* Try to find a one step delta relative to another constant. */
+static int emit_kdelta1(ASMState *as, Reg t, int32_t i)
+{
+  RegSet work = ~as->freeset & RSET_GPR;
+  while (work) {
+    Reg r = rset_picktop(work);
+    IRRef ref = regcost_ref(as->cost[r]);
+    lua_assert(r != t);
+    if (ref < ASMREF_L) {
+      int32_t delta = i - (ra_iskref(ref) ? ra_krefk(as, ref) : IR(ref)->i);
+      if (checki16(delta)) {
+        emit_tsi(as, MIPSI_ADDIU, t, r, delta);
+        return 1;
+      }
+    }
+    rset_clear(work, r);
+  }
+  return 0;  /* Failed. */
+}
+
+/* Load a 32 bit constant into a GPR. */
+static void emit_loadi(ASMState *as, Reg r, int32_t i)
+{
+  if (checki16(i)) {
+    emit_ti(as, MIPSI_LI, r, i);
+  } else {
+    if ((i & 0xffff)) {
+      int32_t jgl = i32ptr(J2G(as->J));
+      if ((uint32_t)(i-jgl) < 65536) {
+        emit_tsi(as, MIPSI_ADDIU, r, RID_JGL, i-jgl-32768);
+        return;
+      } else if (emit_kdelta1(as, r, i)) {
+        return;
+      } else if ((i >> 16) == 0) {
+        emit_tsi(as, MIPSI_ORI, r, RID_ZERO, i);
+        return;
+      }
+      emit_tsi(as, MIPSI_ORI, r, r, i);
+    }
+    emit_ti(as, MIPSI_LUI, r, (i >> 16));
+  }
+}
+
+#define emit_loada(as, r, addr)         emit_loadi(as, (r), i32ptr((addr)))
+
+static Reg ra_allock(ASMState *as, int32_t k, RegSet allow);
+static void ra_allockreg(ASMState *as, int32_t k, Reg r);
+
+/* Get/set from constant pointer. */
+static void emit_lsptr(ASMState *as, MIPSIns mi, Reg r, void *p, RegSet allow)
+{
+  int32_t jgl = i32ptr(J2G(as->J));
+  int32_t i = i32ptr(p);
+  Reg base;
+  if ((uint32_t)(i-jgl) < 65536) {
+    i = i-jgl-32768;
+    base = RID_JGL;
+  } else {
+    base = ra_allock(as, i-(int16_t)i, allow);
+  }
+  emit_tsi(as, mi, r, base, i);
+}
+
+#define emit_loadn(as, r, tv) \
+  emit_lsptr(as, MIPSI_LDC1, ((r) & 31), (void *)(tv), RSET_GPR)
+
+/* Get/set global_State fields. */
+static void emit_lsglptr(ASMState *as, MIPSIns mi, Reg r, int32_t ofs)
+{
+  emit_tsi(as, mi, r, RID_JGL, ofs-32768);
+}
+
+#define emit_getgl(as, r, field) \
+  emit_lsglptr(as, MIPSI_LW, (r), (int32_t)offsetof(global_State, field))
+#define emit_setgl(as, r, field) \
+  emit_lsglptr(as, MIPSI_SW, (r), (int32_t)offsetof(global_State, field))
+
+/* Trace number is determined from per-trace exit stubs. */
+#define emit_setvmstate(as, i)          UNUSED(i)
+
+/* -- Emit control-flow instructions -------------------------------------- */
+
+/* Label for internal jumps. */
+typedef MCode *MCLabel;
+
+/* Return label pointing to current PC. */
+#define emit_label(as)          ((as)->mcp)
+
+static void emit_branch(ASMState *as, MIPSIns mi, Reg rs, Reg rt, MCode *target)
+{
+  MCode *p = as->mcp;
+  ptrdiff_t delta = target - p;
+  lua_assert(((delta + 0x8000) >> 16) == 0);
+  *--p = mi | MIPSF_S(rs) | MIPSF_T(rt) | ((uint32_t)delta & 0xffffu);
+  as->mcp = p;
+}
+
+static void emit_call(ASMState *as, void *target)
+{
+  MCode *p = as->mcp;
+  *--p = MIPSI_NOP;
+  if ((((uintptr_t)target ^ (uintptr_t)p) >> 28) == 0)
+    *--p = MIPSI_JAL | (((uintptr_t)target >>2) & 0x03ffffffu);
+  else  /* Target out of range: need indirect call. */
+    *--p = MIPSI_JALR | MIPSF_S(RID_CFUNCADDR);
+  as->mcp = p;
+  ra_allockreg(as, i32ptr(target), RID_CFUNCADDR);
+}
+
+/* -- Emit generic operations --------------------------------------------- */
+
+#define emit_move(as, dst, src) \
+  emit_ds(as, MIPSI_MOVE, (dst), (src))
+
+/* Generic move between two regs. */
+static void emit_movrr(ASMState *as, IRIns *ir, Reg dst, Reg src)
+{
+  if (dst < RID_MAX_GPR)
+    emit_move(as, dst, src);
+  else
+    emit_fg(as, irt_isnum(ir->t) ? MIPSI_MOV_D : MIPSI_MOV_S, dst, src);
+}
+
+/* Generic load of register from stack slot. */
+static void emit_spload(ASMState *as, IRIns *ir, Reg r, int32_t ofs)
+{
+  if (r < RID_MAX_GPR)
+    emit_tsi(as, MIPSI_LW, r, RID_SP, ofs);
+  else
+    emit_tsi(as, irt_isnum(ir->t) ? MIPSI_LDC1 : MIPSI_LWC1,
+             (r & 31), RID_SP, ofs);
+}
+
+/* Generic store of register to stack slot. */
+static void emit_spstore(ASMState *as, IRIns *ir, Reg r, int32_t ofs)
+{
+  if (r < RID_MAX_GPR)
+    emit_tsi(as, MIPSI_SW, r, RID_SP, ofs);
+  else
+    emit_tsi(as, irt_isnum(ir->t) ? MIPSI_SDC1 : MIPSI_SWC1,
+             (r&31), RID_SP, ofs);
+}
+
+/* Add offset to pointer. */
+static void emit_addptr(ASMState *as, Reg r, int32_t ofs)
+{
+  if (ofs) {
+    lua_assert(checki16(ofs));
+    emit_tsi(as, MIPSI_ADDIU, r, r, ofs);
+  }
+}
+
+#define emit_spsub(as, ofs)     emit_addptr(as, RID_SP, -(ofs))
+