x86 asm: move RDTSC from x86-assembly-cheat, create RDTSCP

userland/arch/x86_64/intrinsics/rdtsc.c

@@ -1,5 +1,6 @@
 /* https://github.com/cirosantilli/linux-kernel-module-cheat#x86-rdtsc-instruction */
 
+#include <inttypes.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -7,8 +8,6 @@
 #include <x86intrin.h>
 
 int main(void) {
-    uintmax_t val;
-    val = __rdtsc();
-    printf("%ju\n", val);
+    printf("0x%016" PRIX64 "\n", (uint64_t)__rdtsc());
     return EXIT_SUCCESS;
 }

userland/arch/x86_64/intrinsics/rdtscp.c

@@ -0,0 +1,15 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#x86-rdtscp-instruction */
+
+#include <inttypes.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <x86intrin.h>
+
+int main(void) {
+    uint32_t pid;
+    printf("0x%016" PRIX64 "\n", (uint64_t)__rdtscp(&pid));
+    printf("0x%08" PRIX32 "\n", pid);
+    return EXIT_SUCCESS;
+}

userland/arch/x86_64/rdtsc.S

@@ -0,0 +1,12 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#x86-rdtsc-instruction */
+
+#include <lkmc.h>
+
+LKMC_PROLOGUE
+    rdtsc
+    mov %edx, %edi
+    shl $32, %rdi
+    add %rax, %rdi
+    call lkmc_print_hex_64
+    call lkmc_print_newline
+LKMC_EPILOGUE

userland/arch/x86_64/rdtscp.S

@@ -0,0 +1,20 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#x86-rdtscp-instruction */
+
+#include <lkmc.h>
+
+LKMC_PROLOGUE
+    rdtscp
+    mov %edx, %edi
+    shl $32, %rdi
+    add %rax, %rdi
+    mov %ecx, %r12d
+
+    /* Print RDTSC. */
+    call lkmc_print_hex_64
+    call lkmc_print_newline
+
+    /* Print PID. */
+    mov %r12d, %edi
+    call lkmc_print_hex_32
+    call lkmc_print_newline
+LKMC_EPILOGUE