[Qemu-devel] [Patch v1 6/8] target_arm: Change the reset values based on the ELF entry

[Alistair Francis]

The Netduino 2 machine won't run unless the reset_pc is based
on the ELF entry point.

Signed-off-by: Alistair Francis <alistai...@gmail.com>
---
 hw/arm/armv7m.c | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/hw/arm/armv7m.c b/hw/arm/armv7m.c
index 5e684a0..816b651 100644
--- a/hw/arm/armv7m.c
+++ b/hw/arm/armv7m.c
@@ -155,11 +155,19 @@ static void armv7m_bitband_init(void)
 
 /* Board init.  */
 
-static void armv7m_reset(void *opaque)
-{
-    ARMCPU *cpu = opaque;
+typedef struct ARMV7MResetArgs {
+    ARMCPU *cpu;
+    uint32_t reset_pc;
+} ARMV7MResetArgs;
+
+ static void armv7m_reset(void *opaque)
+ {
+    ARMV7MResetArgs *args = opaque;
+
+    cpu_reset(CPU(args->cpu));
 
-    cpu_reset(CPU(cpu));
+    args->cpu->env.thumb = args->reset_pc & 1;
+    args->cpu->env.regs[15] = args->reset_pc & ~1;
 }
 
 /* Init CPU and memory for a v7-M based board.
@@ -181,6 +189,7 @@ qemu_irq *armv7m_init(MemoryRegion *system_memory,
     int i;
     int big_endian;
     MemoryRegion *hack = g_new(MemoryRegion, 1);
+    ARMV7MResetArgs reset_args;
 
     if (cpu_model == NULL) {
        cpu_model = "cortex-m3";
@@ -247,7 +256,12 @@ qemu_irq *armv7m_init(MemoryRegion *system_memory,
     vmstate_register_ram_global(hack);
     memory_region_add_subregion(system_memory, 0xfffff000, hack);
 
-    qemu_register_reset(armv7m_reset, cpu);
+    reset_args = (ARMV7MResetArgs) {
+        .cpu = cpu,
+        .reset_pc = entry,
+    };
+    qemu_register_reset(armv7m_reset,
+                        g_memdup(&reset_args, sizeof(reset_args)));
     return pic;
 }
 
-- 
1.9.1