From 45b28d0324a9dcc1ec78bfe423c290a410eff15f Mon Sep 17 00:00:00 2001
From: Paolo Molaro <lupus@oddwiz.org>
Date: Thu, 1 Dec 2011 08:56:28 +0000
Subject: [PATCH] Initial sgen mips port.

---
 configure.in                   |  1 +
 mono/metadata/sgen-archdep.h   | 52 ++++++++++++++++++++++++++++++++++
 mono/metadata/sgen-cardtable.c |  4 ---
 mono/utils/mono-sigcontext.h   |  9 ++++++
 4 files changed, 62 insertions(+), 4 deletions(-)

diff --git a/configure.in b/configure.in
index 6cf9f416d4aa7..a43d7aa1f1462 100644
--- a/configure.in
+++ b/configure.in
@@ -2173,6 +2173,7 @@ case "$host" in
 	mips*)
 		TARGET=MIPS;
 		arch_target=mips;
+		sgen_supported=true
 		ACCESS_UNALIGNED="no"
 		JIT_SUPPORTED=yes
 
diff --git a/mono/metadata/sgen-archdep.h b/mono/metadata/sgen-archdep.h
index d153b3d89d8cc..4c558a418b294 100644
--- a/mono/metadata/sgen-archdep.h
+++ b/mono/metadata/sgen-archdep.h
@@ -134,6 +134,58 @@
 	((a)[13]) = (gpointer) (UCONTEXT_REG_LR((ctx)));	\
 	} while (0)
 
+#elif defined(__mips__)
+
+#define REDZONE_SIZE	0
+
+/* register 0 is always 0, so we skip it */
+#define ARCH_NUM_REGS 31
+#define ARCH_STORE_REGS(ptr)		\
+	__asm__ __volatile__(	\
+		"sw $1,0(%0)\n\t"	\
+		"sw $2,4(%0)\n\t"	\
+		"sw $3,8(%0)\n\t"	\
+		"sw $4,12(%0)\n\t"	\
+		"sw $5,16(%0)\n\t"	\
+		"sw $6,20(%0)\n\t"	\
+		"sw $7,24(%0)\n\t"	\
+		"sw $8,28(%0)\n\t"	\
+		"sw $9,32(%0)\n\t"	\
+		"sw $10,36(%0)\n\t"	\
+		"sw $11,40(%0)\n\t"	\
+		"sw $12,44(%0)\n\t"	\
+		"sw $13,48(%0)\n\t"	\
+		"sw $14,52(%0)\n\t"	\
+		"sw $15,56(%0)\n\t"	\
+		"sw $16,60(%0)\n\t"	\
+		"sw $17,64(%0)\n\t"	\
+		"sw $18,68(%0)\n\t"	\
+		"sw $19,72(%0)\n\t"	\
+		"sw $20,76(%0)\n\t"	\
+		"sw $21,80(%0)\n\t"	\
+		"sw $22,84(%0)\n\t"	\
+		"sw $23,88(%0)\n\t"	\
+		"sw $24,92(%0)\n\t"	\
+		"sw $25,96(%0)\n\t"	\
+		"sw $26,100(%0)\n\t"	\
+		"sw $27,104(%0)\n\t"	\
+		"sw $28,108(%0)\n\t"	\
+		"sw $29,112(%0)\n\t"	\
+		"sw $30,116(%0)\n\t"	\
+		"sw $31,120(%0)\n\t"	\
+		: 			\
+		: "r" (ptr)		\
+		: "memory"			\
+	)
+
+#define ARCH_SIGCTX_SP(ctx)	(UCONTEXT_GREGS((ctx))[29])
+#define ARCH_SIGCTX_IP(ctx)	(UCONTEXT_REG_PC((ctx)))
+#define ARCH_COPY_SIGCTX_REGS(a,ctx) do {			\
+	int __regnum;	\
+	for (__regnum = 0; __regnum < 32; ++__regnum)	\
+		((a)[__regnum]) = (gpointer) (UCONTEXT_GREGS((ctx))[__regnum]);		\
+	} while (0)
+
 #elif defined(__s390x__)
 
 #define REDZONE_SIZE	0
diff --git a/mono/metadata/sgen-cardtable.c b/mono/metadata/sgen-cardtable.c
index ec4cbbcd1e607..5695e6669701d 100644
--- a/mono/metadata/sgen-cardtable.c
+++ b/mono/metadata/sgen-cardtable.c
@@ -345,16 +345,12 @@ find_card_offset (mword card)
 #elif defined(__s390x__)
 	return (__builtin_ffsll (GUINT64_TO_LE(card)) - 1) / 8;
 #else
-	// FIXME:
-	g_assert_not_reached ();
-	/*
 	int i;
 	guint8 *ptr = (guint *) &card;
 	for (i = 0; i < sizeof (mword); ++i) {
 		if (ptr[i])
 			return i;
 	}
-	*/
 	return 0;
 #endif
 }
diff --git a/mono/utils/mono-sigcontext.h b/mono/utils/mono-sigcontext.h
index 0c525b9c92f90..bde60d1297075 100644
--- a/mono/utils/mono-sigcontext.h
+++ b/mono/utils/mono-sigcontext.h
@@ -354,6 +354,15 @@ typedef struct ucontext {
 	#define UCONTEXT_REG_R12(ctx) (((arm_ucontext*)(ctx))->sig_ctx.arm_ip)
 	#define UCONTEXT_REG_CPSR(ctx) (((arm_ucontext*)(ctx))->sig_ctx.arm_cpsr)
 #endif
+#elif defined(__mips__)
+
+# if HAVE_UCONTEXT_H
+#  include <ucontext.h>
+# endif
+
+# define UCONTEXT_GREGS(ctx)	(((ucontext_t *)(ctx))->uc_mcontext.gregs)
+# define UCONTEXT_REG_PC(ctx)	(((ucontext_t *)(ctx))->uc_mcontext.pc)
+
 #elif defined(__s390x__)
 
 # if HAVE_UCONTEXT_H