|// Low-level VM code for PowerPC CPUs.
|// Bytecode interpreter, fast functions and helper functions.
|// Copyright (C) 2005-2010 Mike Pall. See Copyright Notice in luajit.h
|
|.arch ppc
|.section code_op, code_sub
|
|.actionlist build_actionlist
|.globals GLOB_
|.globalnames globnames
|.externnames extnames
|
|.if not SPE
|.error "No support for plain PowerPC CPUs (yet)"
|.endif
|
|// Note: The ragged indentation of the instructions is intentional.
|//       The starting columns indicate data dependencies.
|
|//-----------------------------------------------------------------------
|
|// Fixed register assignments for the interpreter.
|// Don't use: r1 = sp, r2 and r13 = reserved and/or small data area ptr
|
|// The following must be C callee-save (but BASE is often refetched).
|.define BASE,		r14	// Base of current Lua stack frame.
|.define KBASE,		r15	// Constants of current Lua function.
|.define PC,		r16	// Next PC.
|.define DISPATCH,	r17	// Opcode dispatch table.
|.define LREG,		r18	// Register holding lua_State (also in SAVE_L).
|
|// Constants for vectorized type-comparisons (hi+low GPR). C callee-save.
|.define TISNUM,	r21
|.if SPE
|.define TISSTR,	r22
|.define TISTAB,	r23
|.define TISFUNC,	r24
|.define TISNIL,	r25
|.endif
|
|// The following temporaries are not saved across C calls, except for RA.
|.define RA,		r19	// Callee-save.
|.define RB,		r10
|.define RC,		r11
|.define RD,		r12
|.define INS,		r7	// Overlaps CARG5.
|
|.define TMP0,		r0
|.define TMP1,		r8
|.define TMP2,		r9
|.define TMP3,		r6	// Overlaps CARG4.
|
|// Saved temporaries.
|.define SAVE0,		r20
|
|// Calling conventions.
|.define CARG1,		r3
|.define CARG2,		r4
|.define CARG3,		r5
|.define CARG4,		r6	// Overlaps TMP3.
|.define CARG5,		r7	// Overlaps INS.
|
|.define CRET1,		r3
|.define CRET2,		r4
|
|// Stack layout while in interpreter. Must match with lj_frame.h.
|.if SPE
|.define SAVE_LR,	180(sp)
|.define CFRAME_SPACE,	176	// Delta for sp.
|// Back chain for sp:	176(sp)	<-- sp entering interpreter
|.define SAVE_r31,	168(sp)	// 64 bit register saves.
|.define SAVE_r30,	160(sp)
|.define SAVE_r29,	152(sp)
|.define SAVE_r28,	144(sp)
|.define SAVE_r27,	136(sp)
|.define SAVE_r26,	128(sp)
|.define SAVE_r25,	120(sp)
|.define SAVE_r24,	112(sp)
|.define SAVE_r23,	104(sp)
|.define SAVE_r22,	96(sp)
|.define SAVE_r21,	88(sp)
|.define SAVE_r20,	80(sp)
|.define SAVE_r19,	72(sp)
|.define SAVE_r18,	64(sp)
|.define SAVE_r17,	56(sp)
|.define SAVE_r16,	48(sp)
|.define SAVE_r15,	40(sp)
|.define SAVE_r14,	32(sp)
|.define SAVE_ERRF,	28(sp)	// 32 bit C frame info.
|.define SAVE_NRES,	24(sp)
|.define SAVE_CFRAME,	20(sp)
|.define SAVE_L,	16(sp)
|.define SAVE_PC,	12(sp)
|.define SAVE_MULTRES,	8(sp)
|// Next frame lr:	4(sp)
|// Back chain for sp:	0(sp)	<-- sp while in interpreter
|
|.macro save_, reg; evstdd reg, SAVE_..reg; .endmacro
|.macro rest_, reg; evldd reg, SAVE_..reg; .endmacro
|.endif
|
|.macro saveregs
|  stwu sp, -CFRAME_SPACE(sp)
|  save_ r14; save_ r15; save_ r16; save_ r17; save_ r18; save_ r19
|  mflr r0
|  save_ r20; save_ r21; save_ r22; save_ r23; save_ r24; save_ r25
|  stw  r0, SAVE_LR
|  save_ r26; save_ r27; save_ r28; save_ r29; save_ r30; save_ r31
|.endmacro
|
|.macro restoreregs
|  lwz r0, SAVE_LR
|  rest_ r14; rest_ r15; rest_ r16; rest_ r17; rest_ r18; rest_ r19
|  mtlr r0
|  rest_ r20; rest_ r21; rest_ r22; rest_ r23; rest_ r24; rest_ r25
|  rest_ r26; rest_ r27; rest_ r28; rest_ r29; rest_ r30; rest_ r31
|  addi sp, sp, CFRAME_SPACE
|.endmacro
|
|// Type definitions. Some of these are only used for documentation.
|.type L,		lua_State,	LREG
|.type GL,		global_State
|.type TVALUE,		TValue
|.type GCOBJ,		GCobj
|.type STR,		GCstr
|.type TAB,		GCtab
|.type LFUNC,		GCfuncL
|.type CFUNC,		GCfuncC
|.type PROTO,		GCproto
|.type UPVAL,		GCupval
|.type NODE,		Node
|.type NARGS8,		int
|.type TRACE,		GCtrace
|
|//-----------------------------------------------------------------------
|
|// Trap for not-yet-implemented parts.
|.macro NYI; tw 4, sp, sp; .endmacro
|
|//-----------------------------------------------------------------------
|
|// Assumes DISPATCH is relative to GL.
#define DISPATCH_GL(field)	(GG_DISP2G + (int)offsetof(global_State, field))
#define DISPATCH_J(field)	(GG_DISP2J + (int)offsetof(jit_State, field))
|
#define PC2PROTO(field)  ((int)offsetof(GCproto, field)-(int)sizeof(GCproto))
|
|.macro hotloop
|  NYI
|.endmacro
|
|.macro hotcall
|  NYI
|.endmacro
|
|//-----------------------------------------------------------------------

/* Generate subroutines used by opcodes and other parts of the VM. */
/* The .code_sub section should be last to help static branch prediction. */
static void build_subroutines(BuildCtx *ctx)
{
  |.code_sub
  |
  |//-----------------------------------------------------------------------
  |//-- Return handling ----------------------------------------------------
  |//-----------------------------------------------------------------------
  |
  |->vm_returnp:
  |  NYI
  |
  |->vm_returnc:
  |  NYI
  |
  |->vm_return:
  |  NYI
  |
  |->vm_leave_cp:
  |  NYI
  |
  |->vm_leave_unw:
  |  NYI
  |
  |->vm_unwind_c:			// Unwind C stack, return from vm_pcall.
  |  NYI
  |->vm_unwind_c_eh:			// Landing pad for external unwinder.
  |  NYI
  |
  |->vm_unwind_ff:			// Unwind C stack, return from ff pcall.
  |  NYI
  |->vm_unwind_ff_eh:			// Landing pad for external unwinder.
  |  NYI
  |
  |//-----------------------------------------------------------------------
  |//-- Grow stack for calls -----------------------------------------------
  |//-----------------------------------------------------------------------
  |
  |->vm_growstack_c:			// Grow stack for C function.
  |  NYI
  |
  |->vm_growstack_l:			// Grow stack for Lua function.
  |  NYI
  |
  |//-----------------------------------------------------------------------
  |//-- Entry points into the assembler VM ---------------------------------
  |//-----------------------------------------------------------------------
  |
  |->vm_resume:				// Setup C frame and resume thread.
  |  NYI
  |
  |->vm_pcall:				// Setup protected C frame and enter VM.
  |  NYI
  |
  |->vm_call:				// Setup C frame and enter VM.
  |  NYI
  |
  |->vm_call_dispatch:
  |  NYI
  |
  |->vm_call_dispatch_f:
  |  NYI
  |
  |->vm_cpcall:				// Setup protected C frame, call C.
  |  NYI
  |
  |//-----------------------------------------------------------------------
  |//-- Metamethod handling ------------------------------------------------
  |//-----------------------------------------------------------------------
  |
  |//-- Continuation dispatch ----------------------------------------------
  |
  |->cont_dispatch:
  |  NYI
  |
  |->cont_cat:
  |  NYI
  |
  |//-- Table indexing metamethods -----------------------------------------
  |
  |->vmeta_tgets:
  |  NYI
  |
  |->vmeta_tgetb:
  |  NYI
  |
  |->vmeta_tgetv:
  |  NYI
  |
  |//-----------------------------------------------------------------------
  |
  |->vmeta_tsets:
  |  NYI
  |
  |->vmeta_tsetb:
  |  NYI
  |
  |->vmeta_tsetv:
  |  NYI
  |
  |//-- Comparison metamethods ---------------------------------------------
  |
  |->vmeta_comp:
  |  NYI
  |->cont_nop:
  |  NYI
  |
  |->cont_ra:
  |  NYI
  |
  |->cont_condt:
  |  NYI
  |
  |->cont_condf:
  |  NYI
  |
  |->vmeta_equal:
  |  NYI
  |
  |//-- Arithmetic metamethods ---------------------------------------------
  |
  |->vmeta_arith_vn:
  |  NYI
  |
  |->vmeta_arith_nv:
  |  NYI
  |
  |->vmeta_unm:
  |  NYI
  |
  |->vmeta_arith_vv:
  |  NYI
  |
  |->vmeta_binop:
  |  NYI
  |
  |->vmeta_len:
  |  NYI
  |
  |//-- Call metamethod ----------------------------------------------------
  |
  |->vmeta_call_ra:
  |  NYI
  |
  |->vmeta_call:			// Resolve and call __call metamethod.
  |  NYI
  |
  |//-- Argument coercion for 'for' statement ------------------------------
  |
  |->vmeta_for:
  |  NYI
  |
  |//-----------------------------------------------------------------------
  |//-- Fast functions -----------------------------------------------------
  |//-----------------------------------------------------------------------
  |
  |.macro .ffunc, name
  |->ff_ .. name:
  |.endmacro
  |
  |.macro .ffunc_1, name
  |->ff_ .. name:
  |  NYI
  |.endmacro
  |
  |.macro .ffunc_2, name
  |->ff_ .. name:
  |  NYI
  |.endmacro
  |
  |.macro .ffunc_n, name
  |  .ffunc_1 name
  |  NYI
  |.endmacro
  |
  |.macro .ffunc_nn, name
  |  .ffunc_2 name
  |  NYI
  |.endmacro
  |
  |.macro ffgccheck
  |  NYI
  |.endmacro
  |
  |//-- Base library: checks -----------------------------------------------
  |
  |.ffunc assert
  |  NYI
  |
  |.ffunc type
  |  NYI
  |
  |//-- Base library: getters and setters ---------------------------------
  |
  |.ffunc_1 getmetatable
  |  NYI
  |
  |.ffunc_2 setmetatable
  |  NYI
  |
  |.ffunc_2 rawget
  |  NYI
  |
  |//-- Base library: conversions ------------------------------------------
  |
  |.ffunc tonumber
  |  NYI
  |
  |.ffunc_1 tostring
  |  NYI
  |
  |//-- Base library: iterators -------------------------------------------
  |
  |.ffunc_1 next
  |  NYI
  |
  |->fff_res2:
  |  NYI
  |
  |.ffunc_1 pairs
  |  NYI
  |
  |.ffunc_1 ipairs_aux
  |  NYI
  |
  |->fff_res0:
  |  NYI
  |
  |.ffunc_1 ipairs
  |  NYI
  |
  |//-- Base library: catch errors ----------------------------------------
  |
  |.ffunc_1 pcall
  |  NYI
  |
  |.ffunc_2 xpcall
  |  NYI
  |
  |//-- Coroutine library --------------------------------------------------
  |
  |.macro coroutine_resume_wrap, resume
  |.if resume
  |.ffunc_1 coroutine_resume
  |.else
  |.ffunc coroutine_wrap_aux
  |.endif
  |  NYI
  |.endmacro
  |
  |  coroutine_resume_wrap 1		// coroutine.resume
  |  coroutine_resume_wrap 0		// coroutine.wrap
  |
  |.ffunc coroutine_yield
  |  NYI
  |
  |//-- Math library -------------------------------------------------------
  |
  |.ffunc_n math_abs
  |  NYI
  |  // Fallthrough.
  |
  |->fff_res1:
  |  NYI
  |->fff_res:
  |  NYI
  |
  |.macro math_extern, func
  |  .ffunc math_ .. func
  |  NYI
  |.endmacro
  |
  |.macro math_extern2, func
  |  .ffunc math_ .. func
  |  NYI
  |.endmacro
  |
  |  math_extern floor
  |  math_extern ceil
  |
  |  math_extern sqrt
  |  math_extern log
  |  math_extern log10
  |  math_extern exp
  |  math_extern sin
  |  math_extern cos
  |  math_extern tan
  |  math_extern asin
  |  math_extern acos
  |  math_extern atan
  |  math_extern sinh
  |  math_extern cosh
  |  math_extern tanh
  |  math_extern2 atan2
  |  math_extern2 fmod
  |
  |->ff_math_deg:
  |.ffunc_1 math_rad
  |  NYI
  |
  |.ffunc_nn math_ldexp;	NYI
  |.ffunc_n math_frexp;		NYI
  |.ffunc_n math_modf;		NYI
  |
  |.ffunc_nn math_pow;		NYI
  |
  |.macro math_minmax, name, cmpop
  |  .ffunc_1 name
  |  NYI
  |.endmacro
  |
  |  math_minmax math_min, efdtstlt
  |  math_minmax math_max, efdtstgt
  |
  |//-- String library -----------------------------------------------------
  |
  |.ffunc_1 string_len
  |  NYI
  |
  |.ffunc string_byte			// Only handle the 1-arg case here.
  |  NYI
  |
  |.ffunc string_char			// Only handle the 1-arg case here.
  |  NYI
  |
  |->fff_newstr:
  |  NYI
  |
  |.ffunc string_sub
  |  NYI
  |
  |->fff_emptystr:  // Range underflow.
  |  NYI
  |
  |.ffunc_2 string_rep			// Only handle the 1-char case inline.
  |  NYI
  |
  |.ffunc_1 string_reverse
  |  NYI
  |
  |.macro ffstring_case, name, lo, hi
  |  .ffunc_1 name
  |  NYI
  |.endmacro
  |
  |ffstring_case string_lower, 0x41, 0x5a
  |ffstring_case string_upper, 0x61, 0x7a
  |
  |//-- Table library ------------------------------------------------------
  |
  |.ffunc_1 table_getn
  |  NYI
  |
  |//-- Bit library --------------------------------------------------------
  |
  |.ffunc_n bit_tobit
  |  NYI
  |
  |.macro .ffunc_bit, name
  |  .ffunc_n name
  |  NYI
  |.endmacro
  |
  |.macro .ffunc_bit_op, name, ins
  |  .ffunc_bit name
  |  NYI
  |.endmacro
  |
  |.ffunc_bit_op bit_band, and
  |.ffunc_bit_op bit_bor, or
  |.ffunc_bit_op bit_bxor, xor
  |
  |.ffunc_bit bit_bswap
  |  NYI
  |
  |.ffunc_bit bit_bnot
  |  NYI
  |
  |->fff_resbit:
  |  NYI
  |
  |->fff_fallback_bit_op:
  |  NYI
  |
  |.macro .ffunc_bit_sh, name, ins
  |  .ffunc_nn name
  |  NYI
  |.endmacro
  |
  |.ffunc_bit_sh bit_lshift, shl
  |.ffunc_bit_sh bit_rshift, shr
  |.ffunc_bit_sh bit_arshift, sar
  |.ffunc_bit_sh bit_rol, rol
  |.ffunc_bit_sh bit_ror, ror
  |
  |//-----------------------------------------------------------------------
  |
  |->fff_fallback:			// Call fast function fallback handler.
  |  NYI
  |
  |->fff_gcstep:			// Call GC step function.
  |  NYI
  |
  |//-----------------------------------------------------------------------
  |//-- Special dispatch targets -------------------------------------------
  |//-----------------------------------------------------------------------
  |
  |->vm_record:				// Dispatch target for recording phase.
#if LJ_HASJIT
  |  NYI
#endif
  |
  |->vm_rethook:			// Dispatch target for return hooks.
  |  NYI
  |
  |->vm_inshook:			// Dispatch target for instr/line hooks.
  |  NYI
  |
  |->cont_hook:				// Continue from hook yield.
  |  NYI
  |
  |->vm_hotloop:			// Hot loop counter underflow.
#if LJ_HASJIT
  |  NYI
#endif
  |
  |->vm_callhook:			// Dispatch target for call hooks.
  |  NYI
  |
  |->vm_hotcall:			// Hot call counter underflow.
#if LJ_HASJIT
  |  NYI
#endif
  |
  |//-----------------------------------------------------------------------
  |//-- Trace exit handler -------------------------------------------------
  |//-----------------------------------------------------------------------
  |
  |->vm_exit_handler:
#if LJ_HASJIT
  |  NYI
#endif
  |->vm_exit_interp:
#if LJ_HASJIT
  |  NYI
#endif
  |
  |//-----------------------------------------------------------------------
  |//-- Math helper functions ----------------------------------------------
  |//-----------------------------------------------------------------------
  |
  |// FP value rounding. Called by math.floor/math.ceil fast functions
  |// and from JIT code.
  |
  |.macro vm_round, name, mode
  |->name:
  |  NYI
  |.endmacro
  |
  |  vm_round vm_floor, 0
  |  vm_round vm_ceil,  1
  |  vm_round vm_trunc, 2
  |
  |->vm_mod:
  |  NYI
  |
  |->vm_exp:
  |  NYI
  |->vm_exp2:
  |  NYI
  |
  |->vm_pow:
  |  NYI
  |
  |->vm_powi_sse:
  |  NYI
  |
  |->vm_foldfpm:
  |  NYI
  |
  |// Callable from C: double lj_vm_foldarith(double x, double y, int op)
  |// Compute x op y for basic arithmetic operators (+ - * / % ^ and unary -)
  |// and basic math functions. ORDER ARITH
  |->vm_foldarith:
  |  NYI
  |
  |//-----------------------------------------------------------------------
  |//-- Miscellaneous functions --------------------------------------------
  |//-----------------------------------------------------------------------
  |
  |//-----------------------------------------------------------------------
}

/* Generate the code for a single instruction. */
static void build_ins(BuildCtx *ctx, BCOp op, int defop)
{
  |=>defop:

  switch (op) {

  /* -- Comparison ops ---------------------------------------------------- */

  /* Remember: all ops branch for a true comparison, fall through otherwise. */

  case BC_ISLT: case BC_ISGE: case BC_ISLE: case BC_ISGT:
    |  NYI
    break;

  case BC_ISEQV: case BC_ISNEV:
    |  NYI
    break;

  case BC_ISEQS: case BC_ISNES:
    |  NYI
    break;

  case BC_ISEQN: case BC_ISNEN:
    |  NYI
    break;

  case BC_ISEQP: case BC_ISNEP:
    |  NYI
    break;

  /* -- Unary test and copy ops ------------------------------------------- */

  case BC_ISTC: case BC_ISFC: case BC_IST: case BC_ISF:
    |  NYI
    break;

  /* -- Unary ops --------------------------------------------------------- */

  case BC_MOV:
    |  NYI
    break;
  case BC_NOT:
    |  NYI
    break;
  case BC_UNM:
    |  NYI
    break;
  case BC_LEN:
    |  NYI
    break;

  /* -- Binary ops -------------------------------------------------------- */

  case BC_ADDVN: case BC_ADDNV: case BC_ADDVV:
    |  NYI
    break;
  case BC_SUBVN: case BC_SUBNV: case BC_SUBVV:
    |  NYI
    break;
  case BC_MULVN: case BC_MULNV: case BC_MULVV:
    |  NYI
    break;
  case BC_DIVVN: case BC_DIVNV: case BC_DIVVV:
    |  NYI
    break;
  case BC_MODVN:
    |  NYI
    break;
  case BC_MODNV: case BC_MODVV:
    |  NYI
    break;
  case BC_POW:
    |  NYI
    break;

  case BC_CAT:
    |  NYI
    break;

  /* -- Constant ops ------------------------------------------------------ */

  case BC_KSTR:
    |  NYI
    break;
  case BC_KSHORT:
    |  NYI
    break;
  case BC_KNUM:
    |  NYI
    break;
  case BC_KPRI:
    |  NYI
    break;
  case BC_KNIL:
    |  NYI
    break;

  /* -- Upvalue and function ops ------------------------------------------ */

  case BC_UGET:
    |  NYI
    break;
  case BC_USETV:
    |  NYI
    break;
  case BC_USETS:
    |  NYI
    break;
  case BC_USETN:
    |  NYI
    break;
  case BC_USETP:
    |  NYI
    break;
  case BC_UCLO:
    |  NYI
    break;

  case BC_FNEW:
    |  NYI
    break;

  /* -- Table ops --------------------------------------------------------- */

  case BC_TNEW:
    |  NYI
    break;
  case BC_TDUP:
    |  NYI
    break;

  case BC_GGET:
  case BC_GSET:
    |  NYI
    break;

  case BC_TGETV:
    |  NYI
    break;
  case BC_TGETS:
    |  NYI
    break;
  case BC_TGETB:
    |  NYI
    break;

  case BC_TSETV:
    |  NYI
    break;
  case BC_TSETS:
    |  NYI
    break;
  case BC_TSETB:
    |  NYI
    break;

  case BC_TSETM:
    |  NYI
    break;

  /* -- Calls and vararg handling ----------------------------------------- */

  case BC_CALLM:
    |  NYI
    break;
  case BC_CALL:
    |  NYI
    break;

  case BC_CALLMT:
    |  NYI
    break;
  case BC_CALLT:
    |  NYI
    break;

  case BC_ITERC:
    |  NYI
    break;

  case BC_VARG:
    |  NYI
    break;

  /* -- Returns ----------------------------------------------------------- */

  case BC_RETM:
    |  NYI
    break;

  case BC_RET:
    |  NYI
    break;

  case BC_RET0: case BC_RET1:
    |  NYI
    break;

  /* -- Loops and branches ------------------------------------------------ */

  case BC_FORL:
#if LJ_HASJIT
    |  hotloop
#endif
    |  // Fall through. Assumes BC_IFORL follows.
    break;

  case BC_JFORI:
  case BC_JFORL:
#if !LJ_HASJIT
    break;
#endif
  case BC_FORI:
  case BC_IFORL:
    |  NYI
    break;

  case BC_ITERL:
#if LJ_HASJIT
    |  hotloop
#endif
    |  // Fall through. Assumes BC_IITERL follows.
    break;

  case BC_JITERL:
#if !LJ_HASJIT
    break;
#endif
  case BC_IITERL:
    |  NYI
    break;

  case BC_LOOP:
    |  NYI
#if LJ_HASJIT
    |  // Fall through. Assumes BC_ILOOP follows.
#endif
    break;

  case BC_ILOOP:
    |  NYI
    break;

  case BC_JLOOP:
    |  NYI
    break;

  case BC_JMP:
    |  hotcall
    break;

  /* -- Function headers -------------------------------------------------- */

  case BC_FUNCF:
#if LJ_HASJIT
    |  hotcall
#endif
  case BC_FUNCV:  /* NYI: compiled vararg functions. */
    |  // Fall through. Assumes BC_IFUNCF/BC_IFUNCV follow.
    break;

  case BC_JFUNCF:
#if !LJ_HASJIT
    break;
#endif
  case BC_IFUNCF:
    |  NYI
    break;

  case BC_JFUNCV:
#if !LJ_HASJIT
    break;
#endif
    |  NYI  // NYI: compiled vararg functions
    break;  /* NYI: compiled vararg functions. */

  case BC_IFUNCV:
    |  NYI
    break;

  case BC_FUNCC:
  case BC_FUNCCW:
    |  NYI
    break;

  /* ---------------------------------------------------------------------- */

  default:
    fprintf(stderr, "Error: undefined opcode BC_%s\n", bc_names[op]);
    exit(2);
    break;
  }
}

static int build_backend(BuildCtx *ctx)
{
  int op;

  dasm_growpc(Dst, BC__MAX);

  build_subroutines(ctx);

  |.code_op
  for (op = 0; op < BC__MAX; op++)
    build_ins(ctx, (BCOp)op, op);

  return BC__MAX;
}

/* Emit pseudo frame-info for all assembler functions. */
static void emit_asm_debug(BuildCtx *ctx)
{
  /* NYI */
  UNUSED(ctx);
}