Add registers::debug

Author: mkroening

src/asm/asm.s

@@ -257,6 +257,72 @@ _x86_64_asm_write_cr4:
     movq %rdi, %cr4
     retq
 
+.global _x86_64_asm_read_dr0
+.p2align 4
+_x86_64_asm_read_dr0:
+    movq %dr0, %rax
+    retq
+
+.global _x86_64_asm_read_dr1
+.p2align 4
+_x86_64_asm_read_dr1:
+    movq %dr1, %rax
+    retq
+
+.global _x86_64_asm_read_dr2
+.p2align 4
+_x86_64_asm_read_dr2:
+    movq %dr2, %rax
+    retq
+
+.global _x86_64_asm_read_dr3
+.p2align 4
+_x86_64_asm_read_dr3:
+    movq %dr3, %rax
+    retq
+
+.global _x86_64_asm_read_dr6
+.p2align 4
+_x86_64_asm_read_dr6:
+    movq %dr6, %rax
+    retq
+
+.global _x86_64_asm_read_dr7
+.p2align 4
+_x86_64_asm_read_dr7:
+    movq %dr7, %rax
+    retq
+
+.global _x86_64_asm_write_dr0
+.p2align 4
+_x86_64_asm_write_dr0:
+    movq %rdi, %dr0
+    retq
+
+.global _x86_64_asm_write_dr1
+.p2align 4
+_x86_64_asm_write_dr1:
+    movq %rdi, %dr1
+    retq
+
+.global _x86_64_asm_write_dr2
+.p2align 4
+_x86_64_asm_write_dr2:
+    movq %rdi, %dr2
+    retq
+
+.global _x86_64_asm_write_dr3
+.p2align 4
+_x86_64_asm_write_dr3:
+    movq %rdi, %dr3
+    retq
+
+.global _x86_64_asm_write_dr7
+.p2align 4
+_x86_64_asm_write_dr7:
+    movq %rdi, %dr7
+    retq
+
 .global _x86_64_asm_rdmsr
 .p2align 4
 _x86_64_asm_rdmsr:

src/asm/mod.rs

@@ -240,6 +240,72 @@ extern "sysv64" {
     )]
     pub(crate) fn x86_64_asm_write_cr4(value: u64);
 
+    #[cfg_attr(
+        any(target_env = "gnu", target_env = "musl"),
+        link_name = "_x86_64_asm_read_dr0"
+    )]
+    pub(crate) fn x86_64_asm_read_dr0() -> u64;
+
+    #[cfg_attr(
+        any(target_env = "gnu", target_env = "musl"),
+        link_name = "_x86_64_asm_write_dr0"
+    )]
+    pub(crate) fn x86_64_asm_write_dr0(value: u64);
+
+    #[cfg_attr(
+        any(target_env = "gnu", target_env = "musl"),
+        link_name = "_x86_64_asm_read_dr1"
+    )]
+    pub(crate) fn x86_64_asm_read_dr1() -> u64;
+
+    #[cfg_attr(
+        any(target_env = "gnu", target_env = "musl"),
+        link_name = "_x86_64_asm_write_dr1"
+    )]
+    pub(crate) fn x86_64_asm_write_dr1(value: u64);
+
+    #[cfg_attr(
+        any(target_env = "gnu", target_env = "musl"),
+        link_name = "_x86_64_asm_read_dr2"
+    )]
+    pub(crate) fn x86_64_asm_read_dr2() -> u64;
+
+    #[cfg_attr(
+        any(target_env = "gnu", target_env = "musl"),
+        link_name = "_x86_64_asm_write_dr2"
+    )]
+    pub(crate) fn x86_64_asm_write_dr2(value: u64);
+
+    #[cfg_attr(
+        any(target_env = "gnu", target_env = "musl"),
+        link_name = "_x86_64_asm_read_dr3"
+    )]
+    pub(crate) fn x86_64_asm_read_dr3() -> u64;
+
+    #[cfg_attr(
+        any(target_env = "gnu", target_env = "musl"),
+        link_name = "_x86_64_asm_write_dr3"
+    )]
+    pub(crate) fn x86_64_asm_write_dr3(value: u64);
+
+    #[cfg_attr(
+        any(target_env = "gnu", target_env = "musl"),
+        link_name = "_x86_64_asm_read_dr6"
+    )]
+    pub(crate) fn x86_64_asm_read_dr6() -> u64;
+
+    #[cfg_attr(
+        any(target_env = "gnu", target_env = "musl"),
+        link_name = "_x86_64_asm_read_dr7"
+    )]
+    pub(crate) fn x86_64_asm_read_dr7() -> u64;
+
+    #[cfg_attr(
+        any(target_env = "gnu", target_env = "musl"),
+        link_name = "_x86_64_asm_write_dr7"
+    )]
+    pub(crate) fn x86_64_asm_write_dr7(value: u64);
+
     #[cfg_attr(
         any(target_env = "gnu", target_env = "musl"),
         link_name = "_x86_64_asm_rdmsr"