generalize sh entry point asm not to assume call dests fit in 12 bits

this assumption is borderline-unsafe to begin with, and fails badly
with -ffunction-sections since the linker can move the callee
arbitrarily far away when it lies in a different section.

diff --git a/arch/sh/crt_arch.h b/arch/sh/crt_arch.h
index 948bcb79b871bc84db3bb0b08f06bef20e70981b..f341c8fbc096819d69333590bad906653df32ff2 100644 (file)
--- a/arch/sh/crt_arch.h
+++ b/arch/sh/crt_arch.h
@@ -22,7 +22,8 @@ START ": \n"
 "      mov.l 1f, r5 \n"
 "      mov.l 1f+4, r6 \n"
 "      add r0, r5 \n"
-"      bsr __fdpic_fixup \n"
+"      mov.l 4f, r1 \n"
+"5:    bsrf r1 \n"
 "       add r0, r6 \n"
 "      mov r0, r12 \n"
 #endif
@@ -31,11 +32,16 @@ START ": \n"
 "      mov.l r9, @-r15 \n"
 "      mov.l r8, @-r15 \n"
 "      mov #-16, r0 \n"
-"      bsr " START "_c \n"
+"      mov.l 2f, r1 \n"
+"3:    bsrf r1 \n"
 "       and r0, r15 \n"
 ".align 2 \n"
 "1:    .long __ROFIXUP_LIST__@PCREL \n"
 "      .long __ROFIXUP_END__@PCREL + 4 \n"
+"2:    .long " START "_c@PCREL - (3b+4-.) \n"
+#ifndef SHARED
+"4:    .long __fdpic_fixup@PCREL - (5b+4-.) \n"
+#endif
 );
 
 #ifndef SHARED
@@ -53,13 +59,14 @@ START ": \n"
 "      add r0, r5 \n"
 "      mov r15, r4 \n"
 "      mov #-16, r0 \n"
-"      and r0, r15 \n"
-"      bsr " START "_c \n"
-"      nop \n"
+"      mov.l 2f, r1 \n"
+"3:    bsrf r1 \n"
+"       and r0, r15 \n"
 ".align 2 \n"
 ".weak _DYNAMIC \n"
 ".hidden _DYNAMIC \n"
 "1:    .long _DYNAMIC-. \n"
+"2:    .long " START "_c@PCREL - (3b+4-.) \n"
 );
 
 #endif