mips: Add initial jit_va_ calls to mips

* lib/jit_mips-cpu.c, lib/jit_mips-fpu.c, lib/jit_mips.c:
	Add base support to jit vararg functions to the mips backend.
	Currently only supported on the o32 abi, until access to a
	n32 system is arranged.

ChangeLog

@@ -1,3 +1,10 @@
+2015-06-06 Paulo Andrade <pcpa@gnu.org>
+
+	* lib/jit_mips-cpu.c, lib/jit_mips-fpu.c, lib/jit_mips.c:
+	Add base support to jit vararg functions to the mips backend.
+	Currently only supported on the o32 abi, until access to a
+	n32 system is arranged.
+
 2015-06-05 Paulo Andrade <pcpa@gnu.org>
 
 	* lib/jit_ppc-cpu.c, lib/jit_ppc-fpu.c, lib/jit_ppc.c:

lib/jit_mips-cpu.c

@@ -92,12 +92,14 @@ typedef union {
 #    else
 #      define stack_framesize		112
 #    endif
+#    define ldr(u,v)			ldr_i(u,v)
 #    define ldi(u,v)			ldi_i(u,v)
 #    define ldxi(u,v,w)			ldxi_i(u,v,w)
 #    define sti(u,v)			sti_i(u,v)
 #    define stxi(u,v,w)			stxi_i(u,v,w)
 #  else
 #    define stack_framesize		144
+#    define ldr(u,v)			ldr_l(u,v)
 #    define ldi(u,v)			ldi_l(u,v)
 #    define ldxi(u,v,w)			ldxi_l(u,v,w)
 #    define sti(u,v)			sti_l(u,v)
@@ -737,6 +739,10 @@ static jit_word_t _calli_p(jit_state_t*,jit_word_t);
 static void _prolog(jit_state_t*,jit_node_t*);
 #  define epilog(node)			_epilog(_jit,node)
 static void _epilog(jit_state_t*,jit_node_t*);
+#  define vastart(r0)			_vastart(_jit, r0)
+static void _vastart(jit_state_t*, jit_int32_t);
+#  define vaarg(r0, r1)			_vaarg(_jit, r0, r1)
+static void _vaarg(jit_state_t*, jit_int32_t, jit_int32_t);
 #define patch_abs(instr,label)		_patch_abs(_jit,instr,label)
 static void _patch_abs(jit_state_t*,jit_word_t,jit_word_t);
 #define patch_at(jump,label)		_patch_at(_jit,jump,label)
@@ -2948,6 +2954,13 @@ _prolog(jit_state_t *_jit, jit_node_t *node)
 	stxi_i(_jitc->function->aoffoff, _BP_REGNO, rn(index));
 	jit_unget_reg(index);
     }
+
+    if (_jitc->function->self.call & jit_call_varargs) {
+	index = _jitc->function->vagp;
+	offset = stack_framesize + index * sizeof(jit_word_t);
+	for (; jit_arg_reg_p(index); ++index, offset += sizeof(jit_word_t))
+	    stxi(offset, _BP_REGNO, rn(_A0 - index));
+    }
 }
 
 static void
@@ -2977,6 +2990,46 @@ _epilog(jit_state_t *_jit, jit_node_t *node)
     addi(_SP_REGNO, _SP_REGNO, stack_framesize);
 }
 
+static void
+_vastart(jit_state_t *_jit, jit_int32_t r0)
+{
+    jit_int32_t		reg;
+
+    assert(_jitc->function->self.call & jit_call_varargs);
+
+    /* Return jit_va_list_t in the register argument */
+    addi(r0, _BP_REGNO, _jitc->function->vaoff);
+    reg = jit_get_reg(jit_class_gpr);
+
+    /* Initialize stack pointer to the first stack argument. */
+    addi(rn(reg), _BP_REGNO, stack_framesize +
+	 _jitc->function->vagp * sizeof(jit_word_t));
+    stxi(offsetof(jit_va_list_t, stack), r0, rn(reg));
+
+    jit_unget_reg(reg);
+}
+
+static void
+_vaarg(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1)
+{
+    jit_int32_t		reg;
+
+    assert(_jitc->function->self.call & jit_call_varargs);
+    reg = jit_get_reg(jit_class_gpr);
+
+    /* Load varargs stack pointer. */
+    ldxi(rn(reg), r1, offsetof(jit_va_list_t, stack));
+
+    /* Load argument. */
+    ldr(r0, rn(reg));
+
+    /* Update vararg stack pointer. */
+    addi(rn(reg), rn(reg), sizeof(jit_word_t));
+    stxi(offsetof(jit_va_list_t, stack), r1, rn(reg));
+
+    jit_unget_reg(reg);
+}
+
 static void
 _patch_abs(jit_state_t *_jit, jit_word_t instr, jit_word_t label)
 {

lib/jit_mips-fpu.c

@@ -543,6 +543,8 @@ static jit_word_t _bunordr_d(jit_state_t*,jit_word_t,jit_int32_t,jit_int32_t);
 #  define bunordi_d(i0, r0, i1)		_bunordi_d(_jit, i0, r0, i1)
 static jit_word_t
 _bunordi_d(jit_state_t*, jit_word_t, jit_int32_t, jit_float64_t*);
+#  define vaarg_d(r0, r1)		_vaarg_d(_jit, r0, r1)
+static void _vaarg_d(jit_state_t*, jit_int32_t, jit_int32_t);
 #endif
 
 #if CODE
@@ -1774,6 +1776,34 @@ _bunordr_d(jit_state_t *_jit, jit_word_t i0, jit_int32_t r1, jit_int32_t r2)
     return (w);
 }
 dbopi(unord)
+
+static void
+_vaarg_d(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1)
+{
+    jit_int32_t		reg, aln;
+
+    assert(_jitc->function->self.call & jit_call_varargs);
+    reg = jit_get_reg(jit_class_gpr);
+
+    /* Load varargs stack pointer. */
+    ldxi(rn(reg), r1, offsetof(jit_va_list_t, stack));
+
+    /* Align, if required. */
+    aln = jit_get_reg(jit_class_gpr);
+    andi(rn(aln), rn(reg), 7);
+    addr(rn(reg), rn(reg), rn(aln));
+    jit_unget_reg(aln);
+
+    /* Load argument. */
+    ldr_d(r0, rn(reg));
+
+    /* Update vararg stack pointer. */
+    addi(rn(reg), rn(reg), sizeof(jit_float64_t));
+    stxi(offsetof(jit_va_list_t, stack), r1, rn(reg));
+
+    jit_unget_reg(reg);
+}
+
 #  undef fopi
 #  undef fbopi
 #  undef dopi

lib/jit_mips.c

@@ -53,6 +53,13 @@
 #  define I_DISP			STACK_SLOT - sizeof(jit_int32_t)
 #endif
 
+/*
+ * Types
+ */
+typedef struct jit_va_list {
+    jit_pointer_t	stack;
+} jit_va_list_t;
+
 /*
  * Prototypes
  */
@@ -326,6 +333,11 @@ _jit_ellipsis(jit_state_t *_jit)
     else {
 	assert(!(_jitc->function->self.call & jit_call_varargs));
 	_jitc->function->self.call |= jit_call_varargs;
+
+	/* Allocate va_list like object in the stack. */
+	_jitc->function->vaoff = jit_allocai(sizeof(jit_va_list_t));
+
+	_jitc->function->vagp = _jitc->function->self.argi;
     }
 }
 
@@ -1577,9 +1589,19 @@ _emit_code(jit_state_t *_jit)
 			  (jit_float64_t *)node->w.n->u.w);
 		break;
 #endif
+	    case jit_code_va_start:
+		vastart(rn(node->u.w));
+		break;
+	    case jit_code_va_arg:
+		vaarg(rn(node->u.w), rn(node->v.w));
+		break;
+	    case jit_code_va_arg_d:
+		vaarg_d(rn(node->u.w), rn(node->v.w));
+		break;
 	    case jit_code_live:
 	    case jit_code_arg:
 	    case jit_code_arg_f:		case jit_code_arg_d:
+	    case jit_code_va_end:
 		break;
 	    default:
 		abort();