Emulate instructions emitted by OpenBSD/i386 version 5.5:

- CMP REG, r/m
- MOV AX/EAX/RAX, moffset
- MOV moffset, AX/EAX/RAX
- PUSH r/m

2 files changed, 47 insertions, 2 deletions

diff --git a/lib/libvmmapi/vmmapi.c b/lib/libvmmapi/vmmapi.c
index 483aa51..087d0b7 100644
--- a/lib/libvmmapi/vmmapi.c
+++ b/lib/libvmmapi/vmmapi.c
@@ -36,6 +36,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/_iovec.h>
 #include <sys/cpuset.h>
 
+#include <x86/segments.h>
 #include <machine/specialreg.h>
 #include <machine/param.h>
 
@@ -327,6 +328,16 @@ vm_get_desc(struct vmctx *ctx, int vcpu, int reg,
 }
 
 int
+vm_get_seg_desc(struct vmctx *ctx, int vcpu, int reg, struct seg_desc *seg_desc)
+{
+	int error;
+
+	error = vm_get_desc(ctx, vcpu, reg, &seg_desc->base, &seg_desc->limit,
+	    &seg_desc->access);
+	return (error);
+}
+
+int
 vm_set_register(struct vmctx *ctx, int vcpu, int reg, uint64_t val)
 {
 	int error;
@@ -988,7 +999,7 @@ gla2gpa(struct vmctx *ctx, int vcpu, struct vm_guest_paging *paging,
 #endif
 
 int
-vm_gla2gpa(struct vmctx *ctx, int vcpu, struct vm_guest_paging *paging,
+vm_copy_setup(struct vmctx *ctx, int vcpu, struct vm_guest_paging *paging,
     uint64_t gla, size_t len, int prot, struct iovec *iov, int iovcnt)
 {
 	uint64_t gpa;
@@ -1135,3 +1146,30 @@ vm_set_intinfo(struct vmctx *ctx, int vcpu, uint64_t info1)
 	error = ioctl(ctx->fd, VM_SET_INTINFO, &vmii);
 	return (error);
 }
+
+void
+vm_inject_ss(struct vmctx *ctx, int vcpu, int errcode)
+{
+	int error;
+
+	error = vm_inject_exception2(ctx, vcpu, IDT_SS, errcode);
+	assert(error == 0);
+}
+
+void
+vm_inject_ac(struct vmctx *ctx, int vcpu, int errcode)
+{
+	int error;
+
+	error = vm_inject_exception2(ctx, vcpu, IDT_AC, errcode);
+	assert(error == 0);
+}
+
+void
+vm_inject_gp(struct vmctx *ctx, int vcpu, int errcode)
+{
+	int error;
+
+	error = vm_inject_exception2(ctx, vcpu, IDT_GP, errcode);
+	assert(error == 0);
+}
diff --git a/lib/libvmmapi/vmmapi.h b/lib/libvmmapi/vmmapi.h
index 2040c91..72d75c0 100644
--- a/lib/libvmmapi/vmmapi.h
+++ b/lib/libvmmapi/vmmapi.h
@@ -66,6 +66,8 @@ int	vm_set_desc(struct vmctx *ctx, int vcpu, int reg,
 		    uint64_t base, uint32_t limit, uint32_t access);
 int	vm_get_desc(struct vmctx *ctx, int vcpu, int reg,
 		    uint64_t *base, uint32_t *limit, uint32_t *access);
+int	vm_get_seg_desc(struct vmctx *ctx, int vcpu, int reg,
+			struct seg_desc *seg_desc);
 int	vm_set_register(struct vmctx *ctx, int vcpu, int reg, uint64_t val);
 int	vm_get_register(struct vmctx *ctx, int vcpu, int reg, uint64_t *retval);
 int	vm_run(struct vmctx *ctx, int vcpu, uint64_t rip,
@@ -124,13 +126,18 @@ int	vm_get_hpet_capabilities(struct vmctx *ctx, uint32_t *capabilities);
  * The 'iovcnt' should be big enough to accomodate all GPA segments.
  * Returns 0 on success, 1 on a guest fault condition and -1 otherwise.
  */
-int	vm_gla2gpa(struct vmctx *ctx, int vcpu, struct vm_guest_paging *paging,
+int	vm_copy_setup(struct vmctx *ctx, int vcpu, struct vm_guest_paging *pg,
 	    uint64_t gla, size_t len, int prot, struct iovec *iov, int iovcnt);
 void	vm_copyin(struct vmctx *ctx, int vcpu, struct iovec *guest_iov,
 	    void *host_dst, size_t len);
 void	vm_copyout(struct vmctx *ctx, int vcpu, const void *host_src,
 	    struct iovec *guest_iov, size_t len);
 
+/* Helper functions to inject exceptions */
+void	vm_inject_ss(struct vmctx *ctx, int vcpu, int errcode);
+void	vm_inject_ac(struct vmctx *ctx, int vcpu, int errcode);
+void	vm_inject_gp(struct vmctx *ctx, int vcpu, int errcode);
+
 /* Reset vcpu register state */
 int	vcpu_reset(struct vmctx *ctx, int vcpu);