m68k: virt: correctly set the initial PC

According to QEMU parameter, set initial PC to the entry of
the loaded kernel.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20220115203725.3834712-4-laurent@vivier.eu>

hw/m68k/virt.c

@@ -85,14 +85,21 @@
 #define VIRT_VIRTIO_MMIO_BASE 0xff010000     /* MMIO: 0xff010000 - 0xff01ffff */
 #define VIRT_VIRTIO_IRQ_BASE  PIC_IRQ(2, 1)  /* PIC: 2, 3, 4, 5, IRQ: ALL */
 
+typedef struct {
+    M68kCPU *cpu;
+    hwaddr initial_pc;
+    hwaddr initial_stack;
+} ResetInfo;
+
 static void main_cpu_reset(void *opaque)
 {
-    M68kCPU *cpu = opaque;
+    ResetInfo *reset_info = opaque;
+    M68kCPU *cpu = reset_info->cpu;
     CPUState *cs = CPU(cpu);
 
     cpu_reset(cs);
-    cpu->env.aregs[7] = ldl_phys(cs->as, 0);
-    cpu->env.pc = ldl_phys(cs->as, 4);
+    cpu->env.aregs[7] = reset_info->initial_stack;
+    cpu->env.pc = reset_info->initial_pc;
 }
 
 static void virt_init(MachineState *machine)
@@ -113,6 +120,7 @@ static void virt_init(MachineState *machine)
     SysBusDevice *sysbus;
     hwaddr io_base;
     int i;
+    ResetInfo *reset_info;
 
     if (ram_size > 3399672 * KiB) {
         /*
@@ -124,9 +132,13 @@ static void virt_init(MachineState *machine)
         exit(1);
     }
 
+    reset_info = g_malloc0(sizeof(ResetInfo));
+
     /* init CPUs */
     cpu = M68K_CPU(cpu_create(machine->cpu_type));
-    qemu_register_reset(main_cpu_reset, cpu);
+
+    reset_info->cpu = cpu;
+    qemu_register_reset(main_cpu_reset, reset_info);
 
     /* RAM */
     memory_region_add_subregion(get_system_memory(), 0, machine->ram);
@@ -206,7 +218,7 @@ static void virt_init(MachineState *machine)
             error_report("could not load kernel '%s'", kernel_filename);
             exit(1);
         }
-        stl_phys(cs->as, 4, elf_entry); /* reset initial PC */
+        reset_info->initial_pc = elf_entry;
         parameters_base = (high + 1) & ~1;
 
         BOOTINFO1(cs->as, parameters_base, BI_MACHTYPE, MACH_VIRT);