add more gdb tests

baremetal/arch/aarch64/fadd.S

@@ -4,8 +4,11 @@
 main:
     /* 1.5 + 2.5 == 4.0 */
     fmov d0, #1.5
+    /* test-gdb-d0 */
     fmov d1, #2.5
+    /* test-gdb-d1 */
     fadd d2, d0, d1
+    /* test-gdb-d2 */
     fmov d3, #4.0
     fcmp d2, d3
     beq 1f
@@ -14,7 +17,11 @@ main:
 
     /* Now in 32-bit. */
     fmov s0, #1.5
+    /* test-gdb-s0 */
     fmov s1, #2.5
+    /* test-gdb-s1 */
+    fadd s2, s0, s1
+    /* test-gdb-s2 */
     fadd s2, s0, s1
     fmov s3, #4.0
     fcmp s2, s3
@@ -22,4 +29,17 @@ main:
     bl assert_fail
 1:
 
+    /* Higher registers. */
+    fmov d28, #1.5
+    /* test-gdb-d28 */
+    fmov d29, #2.5
+    /* test-gdb-d29 */
+    fadd d30, d28, d29
+    /* test-gdb-d30 */
+    fmov d31, #4.0
+    /* test-gdb-d31 */
+    fcmp d30, d31
+    beq 1f
+    bl assert_fail
+1:
     ret

baremetal/arch/aarch64/fadd.py

@@ -0,0 +1,30 @@
+def test(self):
+    self.sendline('tbreak main')
+    self.sendline('continue')
+
+    # Double.
+    self.continue_to('d0')
+    assert self.get_float('$d0') == 1.5
+    self.continue_to('d1')
+    assert self.get_float('$d1') == 2.5
+    self.continue_to('d2')
+    assert self.get_float('$d2') == 4.0
+
+    # Single.
+    self.continue_to('s0')
+    assert self.get_float('$s0') == 1.5
+    self.continue_to('s1')
+    assert self.get_float('$s1') == 2.5
+    self.continue_to('s2')
+    assert self.get_float('$s2') == 4.0
+
+    # High registers..
+    self.continue_to('d28')
+    assert self.get_float('$d28') == 1.5
+    self.continue_to('d29')
+    assert self.get_float('$d29') == 2.5
+    self.continue_to('d30')
+    assert self.get_float('$d30') == 4.0
+    self.continue_to('d31')
+    assert self.get_float('$d31') == 4.0
+

baremetal/arch/aarch64/regs.S

@@ -0,0 +1,19 @@
+/* Test that we can move:
+ * - set registers
+ * - read x30 */
+.global main
+main:
+    /* test-gdb-before-x29 */
+    mov x0, #1
+    /* test-gdb-x0 */
+    mov x1, #2
+    /* test-gdb-x1 */
+
+    mov x29, #1
+    /* test-gdb-x29 */
+    mov x30, #2
+    /* test-gdb-x30 */
+
+    /* Exit required since we meesed up with x30 which is the lr. */
+    mov x0, #0
+    bl exit

baremetal/arch/aarch64/regs.py

@@ -0,0 +1,10 @@
+def test(self):
+    self.sendline('tbreak main')
+    self.sendline('continue')
+    self.continue_to('x1')
+    self.sendline('set $x30 = 3')
+    self.continue_to('x29')
+    assert self.get_int('$x29') == 1
+    assert self.get_int('$x30') == 3
+    self.continue_to('x30')
+    assert self.get_int('$x30') == 2