[Qemu-devel] [PATCH 5/6 v4] linux-user: Support tilegx architecture in linux-user

[Chen Gang S <gang.chen@sunrus.com.cn>]

Add main working flow feature and loading elf64 tilegx binary feature,
based on Linux kernel tilegx 64-bit implementation.

After this patch, qemu can successfully load elf64 tilegx binary for
linux-user, and the working flow reaches the first correct instruction
position "__start".

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
---
 include/elf.h        |  2 ++
 linux-user/elfload.c | 23 ++++++++++++++++
 linux-user/main.c    | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 99 insertions(+)

diff --git a/include/elf.h b/include/elf.h
index a516584..e70512c 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -133,6 +133,8 @@ typedef int64_t  Elf64_Sxword;
 
 #define EM_AARCH64  183
 
+#define EM_TILEGX   191 /* Tilegx */
+
 /* This is the info that is needed to parse the dynamic section of the file */
 #define DT_NULL		0
 #define DT_NEEDED	1
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 399c021..12e3ab8 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -1189,6 +1189,29 @@ static inline void init_thread(struct target_pt_regs *regs, struct image_info *i
 
 #endif /* TARGET_S390X */
 
+#ifdef TARGET_TILEGX
+
+/* 42 bits real used address, a half for user mode */
+#define ELF_START_MMAP (0x00000020000000000ULL)
+
+#define elf_check_arch(x) ((x) == EM_TILEGX)
+
+#define ELF_CLASS   ELFCLASS64
+#define ELF_DATA    ELFDATA2LSB
+#define ELF_ARCH    EM_TILEGX
+
+static inline void init_thread(struct target_pt_regs *regs,
+                               struct image_info *infop)
+{
+    regs->lr = infop->entry;
+    regs->sp = infop->start_stack;
+
+}
+
+#define ELF_EXEC_PAGESIZE        65536 /* Tilegx page size is 64KB */
+
+#endif /* TARGET_TILEGX */
+
 #ifndef ELF_PLATFORM
 #define ELF_PLATFORM (NULL)
 #endif
diff --git a/linux-user/main.c b/linux-user/main.c
index d92702a..76e5e80 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -3418,6 +3418,20 @@ void cpu_loop(CPUS390XState *env)
 
 #endif /* TARGET_S390X */
 
+#ifdef TARGET_TILEGX
+void cpu_loop(CPUTLState *env)
+{
+    CPUState *cs = CPU(tilegx_env_get_cpu(env));
+
+    while (1) {
+        cpu_exec_start(cs);
+        cpu_tilegx_exec(env);
+        cpu_exec_end(cs);
+        process_pending_signals(env);
+    }
+}
+#endif
+
 THREAD CPUState *thread_cpu;
 
 void task_settid(TaskState *ts)
@@ -4392,6 +4406,66 @@ int main(int argc, char **argv, char **envp)
             env->psw.mask = regs->psw.mask;
             env->psw.addr = regs->psw.addr;
     }
+#elif defined(TARGET_TILEGX)
+    {
+        env->regs[0] = regs->r0;
+        env->regs[1] = regs->r1;
+        env->regs[2] = regs->r2;
+        env->regs[3] = regs->r3;
+        env->regs[4] = regs->r4;
+        env->regs[5] = regs->r5;
+        env->regs[6] = regs->r6;
+        env->regs[7] = regs->r7;
+        env->regs[8] = regs->r8;
+        env->regs[9] = regs->r9;
+        env->regs[10] = regs->r10;
+        env->regs[11] = regs->r11;
+        env->regs[12] = regs->r12;
+        env->regs[13] = regs->r13;
+        env->regs[14] = regs->r14;
+        env->regs[15] = regs->r15;
+        env->regs[16] = regs->r16;
+        env->regs[17] = regs->r17;
+        env->regs[18] = regs->r18;
+        env->regs[19] = regs->r19;
+        env->regs[20] = regs->r20;
+        env->regs[21] = regs->r21;
+        env->regs[22] = regs->r22;
+        env->regs[23] = regs->r23;
+        env->regs[24] = regs->r24;
+        env->regs[25] = regs->r25;
+        env->regs[26] = regs->r26;
+        env->regs[27] = regs->r27;
+        env->regs[28] = regs->r28;
+        env->regs[29] = regs->r29;
+        env->regs[30] = regs->r30;
+        env->regs[31] = regs->r31;
+        env->regs[32] = regs->r32;
+        env->regs[33] = regs->r33;
+        env->regs[34] = regs->r34;
+        env->regs[35] = regs->r35;
+        env->regs[36] = regs->r36;
+        env->regs[37] = regs->r37;
+        env->regs[38] = regs->r38;
+        env->regs[39] = regs->r39;
+        env->regs[40] = regs->r40;
+        env->regs[41] = regs->r41;
+        env->regs[42] = regs->r42;
+        env->regs[43] = regs->r43;
+        env->regs[44] = regs->r44;
+        env->regs[45] = regs->r45;
+        env->regs[46] = regs->r46;
+        env->regs[47] = regs->r47;
+        env->regs[48] = regs->r48;
+        env->regs[49] = regs->r49;
+        env->regs[50] = regs->r50;
+        env->regs[51] = regs->r51;
+        env->regs[52] = regs->r52; /* TILEGX_R_BP */
+        env->regs[53] = regs->tp;  /* TILEGX_R_TP */
+        env->regs[54] = regs->sp;  /* TILEGX_R_SP */
+        env->regs[55] = regs->lr;  /* TILEGX_R_LR */
+        env->pc = regs->lr;
+    }
 #else
 #error unsupported target CPU
 #endif
-- 
1.9.3