gdb: move all tests to userland

baremetal/arch/aarch64/c_from_as.S

@@ -1,5 +0,0 @@
-/* Call a C function. */
-.global main
-main:
-    mov x0, 0
-    bl exit

baremetal/arch/aarch64/dump_regs.c

@@ -0,0 +1,11 @@
+/* Dump as many registers as we feel like to see initial CPU state. */
+
+#include <stdio.h>
+#include <inttypes.h>
+
+int main(void) {
+    uint32_t sctlr_el1;
+    __asm__ ("mrs %0, sctlr_el1" : "=r" (sctlr_el1) : :);
+    printf("sctlr_el1 0x%" PRIx32 "\n", sctlr_el1);
+    return 0;
+}

baremetal/arch/aarch64/return.S

@@ -1,5 +0,0 @@
-/* Return to ensure that the post main works. */
-.global main
-main:
-    mov x0, 0
-    ret

baremetal/arch/aarch64/return1.S

@@ -1,5 +0,0 @@
-/* https://github.com/cirosantilli/linux-kernel-module-cheat#magic-failure-string */
-.global main
-main:
-    mov x0, 1
-    ret

baremetal/arch/arm/add.S

@@ -1,13 +0,0 @@
-.global main
-main:
-    /* 1 + 2 == 3 */
-    mov r0, #1
-    /* test-gdb-op1 */
-    add r1, r0, #2
-    /* test-gdb-result */
-    cmp r1, #3
-    beq 1f
-    bl abort
-1:
-    mov r0, #0
-    bx lr

baremetal/arch/arm/dump_regs.c

@@ -1,15 +1,15 @@
-/* I want to move el and all other "what's the initial value of such system register" into here. */
-
 #include <stdio.h>
 #include <inttypes.h>
 
 int main(void) {
     uint32_t cpsr;
-    /*uint32_t mvfr1;*/
     __asm__ ("mrs %0, cpsr" : "=r" (cpsr) : :);
-    /* TODO this is blowing up an exception, how to I read from it? */
-    /*__asm__ ("vmrs %0, mvfr1" : "=r" (mvfr1) : :);*/
     printf("cpsr  %" PRIx32 "\n", cpsr);
+
+    /* TODO this is blowing up an exception, how to I read from it? */
+    /*uint32_t mvfr1;*/
+    /*__asm__ ("vmrs %0, mvfr1" : "=r" (mvfr1) : :);*/
     /*printf("mvfr1 %" PRIx32 "\n", mvfr1);*/
+
     return 0;
 }

userland/arch/aarch64/gdb_tests/README.adoc

@@ -0,0 +1 @@
+https://github.com/cirosantilli/linux-kernel-module-cheat#gdb-tests

userland/arch/aarch64/gdb_tests/floating_registers.S

@@ -1,7 +1,8 @@
 /* https://github.com/cirosantilli/arm-assembly-cheat/blob/c19e187e98e99f2f4a042783ca238aa4eb2292ab/v8/floating_point.S */
 
-.global main
-main:
+#include <lkmc.h>
+
+LKMC_PROLOGUE
     /* 1.5 + 2.5 == 4.0 */
     fmov d0, 1.5
     /* test-gdb-d0 */
@@ -11,9 +12,7 @@ main:
     /* test-gdb-d2 */
     fmov d3, 4.0
     fcmp d2, d3
-    beq 1f
-    bl abort
-1:
+    LKMC_ASSERT(beq)
 
     /* Now in 32-bit. */
     fmov s0, 1.5
@@ -25,9 +24,7 @@ main:
     fadd s2, s0, s1
     fmov s3, 4.0
     fcmp s2, s3
-    beq 1f
-    bl abort
-1:
+    LKMC_ASSERT(beq)
 
     /* Higher registers. */
     fmov d28, 1.5
@@ -39,9 +36,6 @@ main:
     fmov d31, 4.0
     /* test-gdb-d31 */
     fcmp d30, d31
-    beq 1f
-    bl abort
-1:
+    LKMC_ASSERT(beq)
 
-    mov x0, 0
-    ret
+LKMC_EPILOGUE

userland/arch/aarch64/gdb_tests/integer_registers.S

@@ -1,13 +1,10 @@
-.global main
-main:
+#include <lkmc.h>
+
+LKMC_PROLOGUE
     /* 1 + 2 == 3 */
     mov x0, 1
     /* test-gdb-op1 */
     add x1, x0, 2
     /* test-gdb-result */
-    cmp x1, 3
-    beq 1f
-    bl abort
-1:
-    mov x0, 0
-    ret
+    LKMC_ASSERT_EQ(x1, =3)
+LKMC_EPILOGUE

userland/arch/aarch64/gdb_tests/set_registers.S

@@ -1,9 +1,8 @@
-/* Test that we can move:
- * - set registers
- * - read x30
- */
-.global main
-main:
+/* Test that we can set registers from GDB. */
+
+#include <lkmc.h>
+
+LKMC_PROLOGUE
     mov x0, 1
     /* test-gdb-x0 */
     mov x1, 2
@@ -27,3 +26,5 @@ main:
     /* Exit required since we messed up with x30 which is the lr. */
     mov x0, 0
     bl exit
+
+LKMC_EPILOGUE

userland/arch/arm/gdb_tests/README.adoc

@@ -0,0 +1 @@
+https://github.com/cirosantilli/linux-kernel-module-cheat#gdb-tests

userland/arch/arm/gdb_tests/integer_registers.S

@@ -0,0 +1,10 @@
+#include <lkmc.h>
+
+LKMC_PROLOGUE
+    /* 1 + 2 == 3 */
+    mov r0, 1
+    /* test-gdb-op1 */
+    add r1, r0, 2
+    /* test-gdb-result */
+    LKMC_ASSERT_EQ(r1, =3)
+LKMC_EPILOGUE

userland/arch/arm/gdb_tests/set_registers.S

@@ -1,11 +1,8 @@
-/* See the aarch64 version. */
-
 #include <lkmc.h>
 
 LKMC_PROLOGUE
-    mov r0, #1
+    mov r0, 1
     /* test-gdb-r0 */
-    mov r1, #2
+    mov r1, 2
     /* test-gdb-r1 */
-    mov r0, #0
 LKMC_EPILOGUE