executor: unify ARM64_ADDR_EXECUTOR_CODE and X86_SYZOS_ADDR_EXECUTOR_CODE

Use SYZOS_ADDR_EXECUTOR_CODE instead of both. Also put platform-specific
definitions under #if GOARCH_xxx.

Author: ramosian-glider

executor/common_kvm_amd64.h

@@ -230,7 +230,7 @@ static const struct mem_region syzos_mem_regions[] = {
     // SYZOS user code (generated by the fuzzer).
     {X86_SYZOS_ADDR_USER_CODE, KVM_MAX_VCPU, MEM_REGION_FLAG_READONLY | MEM_REGION_FLAG_USER_CODE},
     // Executor guest code.
-    {X86_SYZOS_ADDR_EXECUTOR_CODE, 4, MEM_REGION_FLAG_READONLY | MEM_REGION_FLAG_EXECUTOR_CODE},
+    {SYZOS_ADDR_EXECUTOR_CODE, 4, MEM_REGION_FLAG_READONLY | MEM_REGION_FLAG_EXECUTOR_CODE},
     // Scratch memory for code generated at runtime.
     {X86_SYZOS_ADDR_SCRATCH_CODE, 1, 0},
     // CPU stack.

executor/common_kvm_arm64.h

@@ -108,7 +108,7 @@ static void setup_vm(int vmfd, void* host_mem, void** text_slot)
 
 	struct addr_size host_text = alloc_guest_mem(&allocator, 4 * KVM_PAGE_SIZE);
 	install_syzos_code(host_text.addr, host_text.size);
-	vm_set_user_memory_region(vmfd, slot++, KVM_MEM_READONLY, ARM64_ADDR_EXECUTOR_CODE, host_text.size, (uintptr_t)host_text.addr);
+	vm_set_user_memory_region(vmfd, slot++, KVM_MEM_READONLY, SYZOS_ADDR_EXECUTOR_CODE, host_text.size, (uintptr_t)host_text.addr);
 
 	struct addr_size next = alloc_guest_mem(&allocator, 2 * KVM_PAGE_SIZE);
 	vm_set_user_memory_region(vmfd, slot++, KVM_MEM_LOG_DIRTY_PAGES, ARM64_ADDR_DIRTY_PAGES, next.size, (uintptr_t)next.addr);

executor/kvm.h

@@ -1,6 +1,8 @@
 // Copyright 2017 syzkaller project authors. All rights reserved.
 // Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
 
+// x86-specific definitions.
+#if GOARCH_amd64
 #define X86_ADDR_TEXT 0x0000
 #define X86_ADDR_PD_IOAPIC 0x0000
 #define X86_ADDR_GDT 0x1000
@@ -33,7 +35,6 @@
 #define X86_ADDR_VAR_USER_CODE 0x9100
 #define X86_ADDR_VAR_USER_CODE2 0x9120
 
-// x86 SYZOS definitions.
 // Zero page (0x0 - 0xfff) is deliberately unused.
 #define X86_SYZOS_ADDR_ZERO 0x0
 #define X86_SYZOS_ADDR_GDT 0x1000
@@ -52,7 +53,8 @@
 #define X86_SYZOS_ADDR_UEXIT (X86_SYZOS_ADDR_EXIT + 256)
 #define X86_SYZOS_ADDR_DIRTY_PAGES 0x41000
 #define X86_SYZOS_ADDR_USER_CODE 0x50000
-#define X86_SYZOS_ADDR_EXECUTOR_CODE 0x54000
+// Location of the SYZOS guest code. Name shared with ARM64 SYZOS.
+#define SYZOS_ADDR_EXECUTOR_CODE 0x54000
 #define X86_SYZOS_ADDR_SCRATCH_CODE 0x58000
 #define X86_SYZOS_ADDR_STACK_BOTTOM 0x90000
 #define X86_SYZOS_ADDR_STACK0 0x90f80
@@ -163,6 +165,7 @@
 
 #define X86_NEXT_INSN $0xbadc0de
 #define X86_PREFIX_SIZE 0xba1d
+#endif // x86-specific definitions.
 
 #define KVM_MAX_VCPU 4
 #define KVM_PAGE_SIZE (1 << 12)
@@ -174,6 +177,8 @@
 	(((~0ULL) - (1ULL << (l)) + 1ULL) & \
 	 (~0ULL >> (63 - (h))))
 
+// ARM64 SYZOS definitions.
+#if GOARCH_arm64
 // GICv3 distributor address.
 #define ARM64_ADDR_GICD_BASE 0x08000000
 // GICv3 ITS address.
@@ -188,7 +193,8 @@
 // Two writable pages with KVM_MEM_LOG_DIRTY_PAGES explicitly set.
 #define ARM64_ADDR_DIRTY_PAGES 0xdddd1000
 #define ARM64_ADDR_USER_CODE 0xeeee0000
-#define ARM64_ADDR_EXECUTOR_CODE 0xeeee8000
+// Location of the SYZOS guest code. Name shared with x86 SYZOS.
+#define SYZOS_ADDR_EXECUTOR_CODE 0xeeee8000
 #define ARM64_ADDR_SCRATCH_CODE 0xeeef0000
 #define ARM64_ADDR_EL1_STACK_BOTTOM 0xffff1000
 
@@ -201,3 +207,5 @@
 #define ARM64_ADDR_ITS_ITT_TABLES (ARM64_ADDR_ITS_CMDQ_BASE + SZ_64K)
 #define ARM64_ADDR_ITS_PROP_TABLE (ARM64_ADDR_ITS_ITT_TABLES + SZ_64K * ITS_MAX_DEVICES)
 #define ARM64_ADDR_ITS_PEND_TABLES (ARM64_ADDR_ITS_PROP_TABLE + SZ_64K)
+
+#endif // ARM64 SYZOS definitions