From b330b468b3f37bd0b11765524548dbdbb1dd1a95 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Thu, 15 Dec 2011 20:39:30 +0100
Subject: [PATCH] MIPS: Add build rules (non-functional, yet).

---
 src/Makefile      | 18 +++++++++++++++++-
 src/buildvm.c     |  3 +++
 src/buildvm_asm.c |  2 ++
 src/lib_jit.c     |  2 ++
 src/lj_arch.h     | 24 ++++++++++++++++++++++++
 src/lj_frame.h    | 10 ++++++++++
 6 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/src/Makefile b/src/Makefile
index 3e5b6dc8..5a60612d 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -54,6 +54,7 @@ CCOPT_X64=
 CCOPT_ARM=
 CCOPT_PPC=
 CCOPT_PPCSPE=
+CCOPT_MIPS=
 #
 CCDEBUG=
 # Uncomment the next line to generate debug information:
@@ -242,6 +243,13 @@ else
 ifneq (,$(findstring LJ_TARGET_PPCSPE ,$(TARGET_TESTARCH)))
   TARGET_CCARCH= ppcspe
   TARGET_XCFLAGS+= $(CCOPT_PPCSPE)
+else
+ifneq (,$(findstring LJ_TARGET_MIPS ,$(TARGET_TESTARCH)))
+  ifneq (,$(findstring MIPSEL ,$(TARGET_TESTARCH)))
+    TARGET_ARCH= -D__MIPSEL__=1
+  endif
+  TARGET_CCARCH= mips
+  TARGET_XCFLAGS+= $(CCOPT_MIPS)
 else
   $(error Unsupported target architecture)
 endif
@@ -249,8 +257,9 @@ endif
 endif
 endif
 endif
+endif
 
-TARGET_ARCH= $(patsubst %,-DLUAJIT_TARGET=LUAJIT_ARCH_%,$(TARGET_CCARCH))
+TARGET_ARCH+= $(patsubst %,-DLUAJIT_TARGET=LUAJIT_ARCH_%,$(TARGET_CCARCH))
 
 ifneq (,$(PREFIX))
 ifneq (/usr/local,$(PREFIX))
@@ -353,6 +362,7 @@ DASM_FLAGS_X64WIN= -D X64 -D X64WIN
 DASM_FLAGS_ARM=
 DASM_FLAGS_PPC=
 DASM_FLAGS_PPCSPE=
+DASM_FLAGS_MIPS=
 
 BUILDVM_O= buildvm.o buildvm_asm.o buildvm_peobj.o buildvm_lib.o buildvm_fold.o
 BUILDVM_T= buildvm
@@ -399,6 +409,7 @@ ALL_HDRGEN= lj_bcdef.h lj_ffdef.h lj_libdef.h lj_recdef.h lj_folddef.h
 ALL_GEN= $(LJVM_S) $(ALL_HDRGEN) $(LIB_VMDEFP)
 ALL_DYNGEN= buildvm_x86.h buildvm_x64.h buildvm_x64win.h buildvm_arm.h \
 	    buildvm_ppc.h buildvm_ppcspe.h
+###ALL_DYNGEN+= buildvm_mips.h
 WIN_RM= *.obj *.lib *.exp *.dll *.exe *.manifest *.pdb *.ilk
 ALL_RM= $(ALL_T) $(ALL_GEN) *.o $(WIN_RM)
 
@@ -491,6 +502,7 @@ distclean:	clean
 	$(Q)$(DASM) $(DASM_DISTFLAGS) $(DASM_FLAGS_ARM) -o buildvm_arm.h buildvm_arm.dasc
 	$(Q)$(DASM) $(DASM_DISTFLAGS) $(DASM_FLAGS_PPC) -o buildvm_ppc.h buildvm_ppc.dasc
 	$(Q)$(DASM) $(DASM_DISTFLAGS) $(DASM_FLAGS_PPCSPE) -o buildvm_ppcspe.h buildvm_ppcspe.dasc
+	@### $(Q)$(DASM) $(DASM_DISTFLAGS) $(DASM_FLAGS_MIPS) -o buildvm_mips.h buildvm_mips.dasc
 
 depend:
 	@for file in $(ALL_HDRGEN) $(ALL_DYNGEN); do \
@@ -536,6 +548,10 @@ buildvm_ppcspe.h: buildvm_ppcspe.dasc
 	$(E) "DYNASM    $@"
 	$(Q)$(DASM) $(DASM_FLAGS) $(DASM_FLAGS_PPCSPE) -o $@ buildvm_ppcspe.dasc
 
+buildvm_mips.h: buildvm_mips.dasc
+	$(E) "DYNASM    $@"
+	$(Q)$(DASM) $(DASM_FLAGS) $(DASM_FLAGS_MIPS) -o $@ buildvm_mips.dasc
+
 buildvm.o: $(ALL_DYNGEN) $(DASM_DIR)/dasm_*.h
 
 $(BUILDVM_T): $(BUILDVM_O)
diff --git a/src/buildvm.c b/src/buildvm.c
index 3e5d7b1c..43e6d88b 100644
--- a/src/buildvm.c
+++ b/src/buildvm.c
@@ -74,6 +74,9 @@ static int collect_reloc(BuildCtx *ctx, uint8_t *addr, int idx, int type);
 #elif LJ_TARGET_PPCSPE
 #include "../dynasm/dasm_ppc.h"
 #include "buildvm_ppcspe.h"
+#elif LJ_TARGET_MIPS
+#include "../dynasm/dasm_mips.h"
+#include "buildvm_mips.h"
 #else
 #error "No support for this architecture (yet)"
 #endif
diff --git a/src/buildvm_asm.c b/src/buildvm_asm.c
index 01330456..236dd176 100644
--- a/src/buildvm_asm.c
+++ b/src/buildvm_asm.c
@@ -119,6 +119,8 @@ static void emit_asm_wordreloc(BuildCtx *ctx, uint8_t *p, int n,
 	    ins, sym);
     exit(1);
   }
+#elif LJ_TARGET_MIPS
+  UNUSED(sym);  /* NYI */
 #else
 #error "missing relocation support for this architecture"
 #endif
diff --git a/src/lib_jit.c b/src/lib_jit.c
index d4277add..8cb511ca 100644
--- a/src/lib_jit.c
+++ b/src/lib_jit.c
@@ -614,6 +614,8 @@ static uint32_t jit_cpudetect(lua_State *L)
 #endif
 #elif LJ_TARGET_PPC || LJ_TARGET_PPCSPE
   /* Nothing to do. */
+#elif LJ_TARGET_MIPS
+  /* NYI */
 #else
 #error "Missing CPU detection for this architecture"
 #endif
diff --git a/src/lj_arch.h b/src/lj_arch.h
index 50a6ef00..3a52c212 100644
--- a/src/lj_arch.h
+++ b/src/lj_arch.h
@@ -23,6 +23,8 @@
 #define LUAJIT_ARCH_ppc		4
 #define LUAJIT_ARCH_PPCSPE	5
 #define LUAJIT_ARCH_ppcspe	5
+#define LUAJIT_ARCH_MIPS	6
+#define LUAJIT_ARCH_mips	6
 
 /* Target OS. */
 #define LUAJIT_OS_OTHER		0
@@ -47,6 +49,8 @@
 #else
 #define LUAJIT_TARGET	LUAJIT_ARCH_PPC
 #endif
+#elif defined(__mips__) || defined(__mips) || defined(__MIPS__) || defined(__MIPS)
+#define LUAJIT_TARGET	LUAJIT_ARCH_MIPS
 #else
 #error "No support for this architecture (yet)"
 #endif
@@ -182,6 +186,26 @@
 #define LJ_ARCH_NOFFI		1	/* NYI: comparisons, calls. */
 #define LJ_ARCH_NOJIT		1
 
+#elif LUAJIT_TARGET == LUAJIT_ARCH_MIPS
+
+#define LJ_ARCH_NAME		"mips"
+#define LJ_ARCH_BITS		32
+#if defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL)
+#define LJ_ARCH_ENDIAN		LUAJIT_LE
+#else
+#define LJ_ARCH_ENDIAN		LUAJIT_BE
+#endif
+#define LJ_ARCH_HASFPU		1
+#define LJ_TARGET_MIPS		1
+#define LJ_TARGET_EHRETREG	4
+#define LJ_TARGET_JUMPRANGE	27	/* 2*2^27 = 256MB-aligned region */
+#define LJ_TARGET_MASKSHIFT	1
+#define LJ_TARGET_MASKROT	1
+#define LJ_TARGET_UNIFYROT	2	/* Want only IR_BROR. */
+#define LJ_ARCH_NUMMODE		LJ_NUMMODE_SINGLE
+#define LJ_ARCH_NOFFI		1
+#define LJ_ARCH_NOJIT		1
+
 #else
 #error "No target architecture defined"
 #endif
diff --git a/src/lj_frame.h b/src/lj_frame.h
index 3497671b..a69917ee 100644
--- a/src/lj_frame.h
+++ b/src/lj_frame.h
@@ -117,6 +117,16 @@ enum {
 #define CFRAME_OFS_MULTRES	8
 #define CFRAME_SIZE		184
 #define CFRAME_SHIFT_MULTRES	3
+#elif LJ_TARGET_MIPS
+/* NYI: Dummy definitions for now. */
+#define CFRAME_OFS_ERRF		0
+#define CFRAME_OFS_NRES		0
+#define CFRAME_OFS_PREV		0
+#define CFRAME_OFS_L		0
+#define CFRAME_OFS_PC		0
+#define CFRAME_OFS_MULTRES	0
+#define CFRAME_SIZE		256
+#define CFRAME_SHIFT_MULTRES	3
 #else
 #error "Missing CFRAME_* definitions for this architecture"
 #endif