diff --git a/stand/powerpc/kboot/Makefile b/stand/powerpc/kboot/Makefile
--- a/stand/powerpc/kboot/Makefile
+++ b/stand/powerpc/kboot/Makefile
@@ -18,8 +18,8 @@
 
 # Architecture-specific loader code
 SRCS=		conf.c vers.c main.c ppc64_elf_freebsd.c
-SRCS+=		host_syscall.S hostcons.c hostdisk.c kerneltramp.S kbootfdt.c
-SRCS+=		ucmpdi2.c gfx_fb.c
+SRCS+=		host_init.S host_syscall.S hostcons.c hostdisk.c kerneltramp.S
+SRCS+=		kbootfdt.c ucmpdi2.c gfx_fb.c
 
 CFLAGS.gfx_fb.c += -I${SRCTOP}/contrib/pnglite
 CFLAGS.gfx_fb.c += -I${SRCTOP}/sys/teken
diff --git a/stand/powerpc/kboot/host_init.S b/stand/powerpc/kboot/host_init.S
new file mode 100644
--- /dev/null
+++ b/stand/powerpc/kboot/host_init.S
@@ -0,0 +1,51 @@
+/*
+ *
+ * $FreeBSD$
+ */
+
+#include <machine/asm.h>
+
+/*
+ * Linux-style entry point:
+ * r1: Initial sp
+ * r2: Intialized by ENTRY macro
+ * r3: Need to load argc
+ * r4: Need to load argv
+ * r5: Need to load envp
+ * r6: Need to load auxv
+ * r7: atexit pointer or 0
+ */
+ENTRY(_start)
+	/* Use r6 to traverse the stack. */
+	mr	%r6, %r1
+
+	/* Set up initial stack frame. */
+	addi	%r1, %r1, -16
+	/* Ensure we're aligned. */
+	clrrwi	%r1, %r1, 4
+
+	li	%r0, 0
+	/* Ensure the backchain is disconnected. */
+	stw	%r0, 0(%r1)
+
+	lwz	%r3, 0(%r6)     /* argc */
+	addi	%r6, %r6, 4     /* next dword */
+	mr	%r4, %r6        /* argv */
+	mulli	%r5, %r3, 4     /* compute argv size */
+	add	%r6, %r6, %r5   /* skip over argv */
+	addi	%r6, %r6, 4     /* next dword */
+	mr	%r5, %r6        /* envp */
+	/*
+	 * Don't bother with auxv for now. If we end up needing it, it's a
+	 * word past the first null pointer in envp.
+	 */
+	li	%r6, 0
+
+	/* This appears to be set to &_start on PPC32. We don't care. */
+	li	%r7, 0
+
+	bl	main
+	/* Exit via syscall. */
+	b	host_exit
+
+END(_start)
diff --git a/stand/powerpc/kboot/host_syscall.S b/stand/powerpc/kboot/host_syscall.S
--- a/stand/powerpc/kboot/host_syscall.S
+++ b/stand/powerpc/kboot/host_syscall.S
@@ -5,6 +5,12 @@
 
 #include <machine/asm.h>
 
+ENTRY(host_exit)
+	li %r0, 1 # SYS_exit
+	sc
+	trap
+END(host_exit)
+
 ENTRY(host_read)
 	li %r0, 3 # SYS_read
 	sc
diff --git a/stand/powerpc/kboot/main.c b/stand/powerpc/kboot/main.c
--- a/stand/powerpc/kboot/main.c
+++ b/stand/powerpc/kboot/main.c
@@ -250,11 +250,12 @@
 }
 
 int
-main(int argc, const char **argv)
+main(int argc, const char **argv, char **envp)
 {
 	void *heapbase;
 	const size_t heapsize = 15*1024*1024;
 	const char *bootdev;
+	char **env;
 
 	/*
 	 * Set the heap to one page after the end of the loader.
@@ -262,6 +263,12 @@
 	heapbase = host_getmem(heapsize);
 	setheap(heapbase, heapbase + heapsize);
 
+	/*
+	 * Copy out environment.
+	 */
+	for (env = envp; *env != NULL; env++)
+		putenv(*env);
+
 	/*
 	 * Set up console.
 	 */
@@ -480,23 +487,6 @@
 	*ptr = &loaded_segments[0];
 }
 
-void
-_start(int argc, const char **argv, char **env)
-{
-// This makes error "variable 'sp' is uninitialized" be just a warning on clang.
-// Initializing 'sp' is not desired here as it would overwrite "r1" original value
-#if defined(__clang__)
-#pragma clang diagnostic push
-#pragma clang diagnostic warning "-Wuninitialized"
-#endif
-	register volatile void **sp asm("r1");
-	main((int)sp[0], (const char **)&sp[1]);
-#if defined(__clang__)
-#pragma clang diagnostic pop
-#endif
-
-}
-
 /*
  * Since proper fdt command handling function is defined in fdt_loader_cmd.c,
  * and declaring it as extern is in contradiction with COMMAND_SET() macro