[Qemu-devel] [PATCH v6 21/24] linux-user: Add AArch64 support

[Peter Maydell]

From: Alexander Graf <address@hidden>

This patch adds support for AArch64 in all the small corners of
linux-user (primarily in image loading and startup code).

Signed-off-by: Alexander Graf <address@hidden>
Signed-off-by: John Rigby <address@hidden>
Message-id: address@hidden
[PMM:
 * removed some unnecessary #defines from syscall.h
 * catch attempts to use a 32 bit only cpu with aarch64-linux-user
 * termios stuff moved into its own patch
 * we specify our minimum uname version here now
]
Signed-off-by: Peter Maydell <address@hidden>
---
 linux-user/aarch64/syscall.h |    9 +++++++++
 linux-user/elfload.c         |   15 +++++++++++++--
 linux-user/main.c            |   16 ++++++++++++++++
 3 files changed, 38 insertions(+), 2 deletions(-)
 create mode 100644 linux-user/aarch64/syscall.h

diff --git a/linux-user/aarch64/syscall.h b/linux-user/aarch64/syscall.h
new file mode 100644
index 0000000..aef419e
--- /dev/null
+++ b/linux-user/aarch64/syscall.h
@@ -0,0 +1,9 @@
+struct target_pt_regs {
+    uint64_t        regs[31];
+    uint64_t        sp;
+    uint64_t        pc;
+    uint64_t        pstate;
+};
+
+#define UNAME_MACHINE "aarch64"
+#define UNAME_MINIMUM_RELEASE "3.8.0"
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 7ce2eab..e2f40b9 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -269,16 +269,26 @@ static void elf_core_copy_regs(target_elf_gregset_t 
*regs, const CPUX86State *en
 
 #define ELF_START_MMAP 0x80000000
 
-#define elf_check_arch(x) ( (x) == EM_ARM )
+#define elf_check_arch(x) ((x) == ELF_MACHINE)
 
+#define ELF_ARCH        ELF_MACHINE
+
+#ifdef TARGET_AARCH64
+#define ELF_CLASS       ELFCLASS64
+#else
 #define ELF_CLASS       ELFCLASS32
-#define ELF_ARCH        EM_ARM
+#endif
 
 static inline void init_thread(struct target_pt_regs *regs,
                                struct image_info *infop)
 {
     abi_long stack = infop->start_stack;
     memset(regs, 0, sizeof(*regs));
+
+#ifdef TARGET_AARCH64
+    regs->pc = infop->entry & ~0x3ULL;
+    regs->sp = stack;
+#else
     regs->ARM_cpsr = 0x10;
     if (infop->entry & 1)
         regs->ARM_cpsr |= CPSR_T;
@@ -292,6 +302,7 @@ static inline void init_thread(struct target_pt_regs *regs,
     /* For uClinux PIC binaries.  */
     /* XXX: Linux does this only on ARM with no MMU (do we care ?) */
     regs->ARM_r10 = infop->start_data;
+#endif
 }
 
 #define ELF_NREG    18
diff --git a/linux-user/main.c b/linux-user/main.c
index d530f01..e213085 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -3964,6 +3964,22 @@ int main(int argc, char **argv, char **envp)
     cpu_x86_load_seg(env, R_FS, 0);
     cpu_x86_load_seg(env, R_GS, 0);
 #endif
+#elif defined(TARGET_AARCH64)
+    {
+        int i;
+
+        if (!(arm_feature(env, ARM_FEATURE_AARCH64))) {
+            fprintf(stderr,
+                    "The selected ARM CPU does not support 64 bit mode\n");
+            exit(1);
+        }
+
+        for (i = 0; i < 31; i++) {
+            env->xregs[i] = regs->regs[i];
+        }
+        env->pc = regs->pc;
+        env->xregs[31] = regs->sp;
+    }
 #elif defined(TARGET_ARM)
     {
         int i;
-- 
1.7.9.5