For ia32 syscall(), call cpu_set_syscall_retval(). Update comment inside

cpu_set_syscall_retval() accordingly.

MFC after:	1 week

2 files changed, 6 insertions, 30 deletions

diff --git a/sys/amd64/amd64/vm_machdep.c b/sys/amd64/amd64/vm_machdep.c
index 6e56740..a99fdaa 100644
--- a/sys/amd64/amd64/vm_machdep.c
+++ b/sys/amd64/amd64/vm_machdep.c
@@ -330,10 +330,14 @@ cpu_set_syscall_retval(struct thread *td, int error)
 
 	case ERESTART:
 		/*
-		 * Reconstruct pc, we know that 'syscall' is 2 bytes.
+		 * Reconstruct pc, we know that 'syscall' is 2 bytes,
+		 * lcall $X,y is 7 bytes, int 0x80 is 2 bytes.
+		 * We saved this in tf_err.
 		 * We have to do a full context restore so that %r10
 		 * (which was holding the value of %rcx) is restored
 		 * for the next iteration.
+		 * r10 restore is only required for freebsd/amd64 processes,
+		 * but shall be innocent for any ia32 ABI.
 		 */
 		td->td_frame->tf_rip -= td->td_frame->tf_err;
 		td->td_frame->tf_r10 = td->td_frame->tf_rcx;
diff --git a/sys/amd64/ia32/ia32_syscall.c b/sys/amd64/ia32/ia32_syscall.c
index 4807248..5e20876 100644
--- a/sys/amd64/ia32/ia32_syscall.c
+++ b/sys/amd64/ia32/ia32_syscall.c
@@ -183,35 +183,7 @@ ia32_syscall(struct trapframe *frame)
 		AUDIT_SYSCALL_EXIT(error, td);
 	}
 
-	switch (error) {
-	case 0:
-		frame->tf_rax = td->td_retval[0];
-		frame->tf_rdx = td->td_retval[1];
-		frame->tf_rflags &= ~PSL_C;
-		break;
-
-	case ERESTART:
-		/*
-		 * Reconstruct pc, assuming lcall $X,y is 7 bytes,
-		 * int 0x80 is 2 bytes. We saved this in tf_err.
-		 */
-		frame->tf_rip -= frame->tf_err;
-		break;
-
-	case EJUSTRETURN:
-		break;
-
-	default:
- 		if (p->p_sysent->sv_errsize) {
- 			if (error >= p->p_sysent->sv_errsize)
-  				error = -1;	/* XXX */
-   			else
-  				error = p->p_sysent->sv_errtbl[error];
-		}
-		frame->tf_rax = error;
-		frame->tf_rflags |= PSL_C;
-		break;
-	}
+	cpu_set_syscall_retval(td, error);
 
 	/*
 	 * Traced syscall.