m68k host port (Richard Zidlicky)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@357 c046a42c-6fe2-441c-8c8c-71466251a162

Makefile.target

@@ -79,6 +79,11 @@ OP_CFLAGS=$(CFLAGS) -mno-sched-prolog
 LDFLAGS+=-Wl,-T,$(SRC_PATH)/arm.ld
 endif
 
+ifeq ($(ARCH),m68k)
+OP_CFLAGS=$(CFLAGS) -fomit-frame-pointer
+LDFLAGS+=-Wl,-T,m68k.ld
+endif
+
 ifeq ($(HAVE_GCC3_OPTIONS),yes)
 # very important to generate a return at the end of every operation
 OP_CFLAGS+=-fno-reorder-blocks -fno-optimize-sibling-calls

configure

@@ -56,6 +56,9 @@ case "$cpu" in
   ia64)
     cpu="ia64"
   ;;
+  m68k)
+    cpu="m68k"
+  ;;
   *)
     cpu="unknown"
   ;;
@@ -163,7 +166,7 @@ fi
 else
 
 # if cross compiling, cannot launch a program, so make a static guess
-if test "$cpu" = "powerpc" -o "$cpu" = "mips" -o "$cpu" = "s390" -o "$cpu" = "sparc" -o "$cpu" = "sparc64"; then
+if test "$cpu" = "powerpc" -o "$cpu" = "mips" -o "$cpu" = "s390" -o "$cpu" = "sparc" -o "$cpu" = "sparc64" -o "$cpu" = "m68k"; then
     bigendian="yes"
 fi
 
@@ -265,6 +268,9 @@ elif test "$cpu" = "sparc64" ; then
 elif test "$cpu" = "ia64" ; then
   echo "ARCH=ia64" >> $config_mak
   echo "#define HOST_IA64 1" >> $config_h
+elif test "$cpu" = "m68k" ; then
+  echo "ARCH=m68k" >> config.mak
+  echo "#define HOST_M68K 1" >> $TMPH
 else
   echo "Unsupported CPU"
   exit 1

cpu-exec.c

@@ -642,6 +642,23 @@ int cpu_signal_handler(int host_signum, struct siginfo *info,
                              &uc->uc_sigmask);
 }
 
+#elif defined(__mc68000)
+
+int cpu_signal_handler(int host_signum, struct siginfo *info, 
+                       void *puc)
+{
+    struct ucontext *uc = puc;
+    unsigned long pc;
+    int is_write;
+    
+    pc = uc->uc_mcontext.gregs[16];
+    /* XXX: compute is_write */
+    is_write = 0;
+    return handle_cpu_signal(pc, (unsigned long)info->si_addr, 
+                             is_write,
+                             &uc->uc_sigmask);
+}
+
 #else
 
 #error host CPU specific signal handler needed

dyngen-exec.h

@@ -109,6 +109,13 @@ extern int printf(const char *, ...);
 #define AREG5 "$13"
 #define AREG6 "$14"
 #endif
+#ifdef __mc68000
+#define AREG0 "%a5"
+#define AREG1 "%a4"
+#define AREG2 "%d7"
+#define AREG3 "%d6"
+#define AREG4 "%d5"
+#endif
 #ifdef __ia64__
 #define AREG0 "r27"
 #define AREG1 "r24"
@@ -178,4 +185,6 @@ extern int __op_jmp0, __op_jmp1;
 #ifdef __arm__
 #define EXIT_TB() asm volatile ("b exec_loop")
 #endif
-
+#ifdef __mc68000
+#define EXIT_TB() asm volatile ("rts")
+#endif

dyngen.c

@@ -86,6 +86,13 @@
 #define elf_check_arch(x) ((x) == EM_ARM)
 #define ELF_USES_RELOC
 
+#elif defined(HOST_M68K)
+
+#define ELF_CLASS	ELFCLASS32
+#define ELF_ARCH	EM_68K
+#define elf_check_arch(x) ((x) == EM_68K)
+#define ELF_USES_RELOCA
+
 #else
 #error unsupported CPU - please update the code
 #endif
@@ -575,6 +582,21 @@ void gen_code(const char *name, host_ulong offset, host_ulong size,
                                       relocs, nb_relocs);
         break;
 #endif
+    case EM_68K:
+	{
+	    uint8_t *p;
+	    p = (void *)(p_end - 2);
+	    if (p == p_start)
+		error("empty code for %s", name);
+	    // remove NOP's, probably added for alignment
+	    while ((get16((uint16_t *)p) == 0x4e71) &&
+		   (p>p_start)) 
+	      p -= 2;
+	    if (get16((uint16_t *)p) != 0x4e75)
+		error("rts expected at the end of %s", name);
+	    copy_size = p - p_start;
+	}
+        break;
     default:
 	error("unknown ELF architecture");
     }
@@ -1062,6 +1084,41 @@ void gen_code(const char *name, host_ulong offset, host_ulong size,
                 }
                 }
             }
+#elif defined(HOST_M68K)
+            {
+                char name[256];
+                int type;
+                int addend;
+		Elf32_Sym *sym;
+                for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
+                if (rel->r_offset >= start_offset &&
+		    rel->r_offset < start_offset + copy_size) {
+		    sym = &(symtab[ELFW(R_SYM)(rel->r_info)]);
+                    sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
+                    if (strstart(sym_name, "__op_param", &p)) {
+                        snprintf(name, sizeof(name), "param%s", p);
+                    } else {
+                        snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
+                    }
+                    type = ELF32_R_TYPE(rel->r_info);
+                    addend = get32((uint32_t *)(text + rel->r_offset)) + rel->r_addend;
+                    switch(type) {
+                    case R_68K_32:
+		        fprintf(outfile, "    /* R_68K_32 RELOC, offset %x */\n", rel->r_offset) ;
+                        fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %#x;\n", 
+                                rel->r_offset - start_offset, name, addend );
+                        break;
+                    case R_68K_PC32:
+		        fprintf(outfile, "    /* R_68K_PC32 RELOC, offset %x */\n", rel->r_offset);
+                        fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %#x) + %#x;\n", 
+                                rel->r_offset - start_offset, name, rel->r_offset - start_offset, /*sym->st_value+*/ addend);
+                        break;
+                    default:
+                        error("unsupported m68k relocation (%d)", type);
+                    }
+                }
+                }
+            }
 #else
 #error unsupported CPU
 #endif

dyngen.h

@@ -94,6 +94,14 @@ static inline void flush_icache_range(unsigned long start, unsigned long stop)
 }
 #endif
 
+#ifdef __mc68000
+#include <asm/cachectl.h>
+static inline void flush_icache_range(unsigned long start, unsigned long stop)
+{
+    cacheflush(start,FLUSH_SCOPE_LINE,FLUSH_CACHE_BOTH,stop-start+16);
+}
+#endif
+
 #ifdef __alpha__
 
 register int gp asm("$29");

exec.h

@@ -348,6 +348,18 @@ static inline int testandset (int *spinlock)
 }
 #endif
 
+#ifdef __mc68000
+static inline int testandset (int *p)
+{
+    char ret;
+    __asm__ __volatile__("tas %1; sne %0"
+                         : "=r" (ret)
+                         : "m" (p)
+                         : "cc","memory");
+    return ret == 0;
+}
+#endif
+
 typedef int spinlock_t;
 
 #define SPIN_LOCK_UNLOCKED 0

m68k.ld

+/* Script for -z combreloc: combine and sort reloc sections */
+OUTPUT_FORMAT("elf32-m68k", "elf32-m68k",
+	      "elf32-m68k")
+OUTPUT_ARCH(m68k)
+ENTRY(_start)
+SEARCH_DIR("/usr/local/m68k-linux/lib");
+/* Do we need any of these for elf?
+   __DYNAMIC = 0;    */
+SECTIONS
+{
+  /* Read-only sections, merged into text segment: */
+  . = 0x60000000 + SIZEOF_HEADERS;
+  .interp         : { *(.interp) }
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+  .got            : { *(.got.plt) *(.got) }
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