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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.
This commit is contained in:
Rich Felker 2015-11-02 18:11:36 -05:00
parent 4cd8b47259
commit 4fcb48275a
1 changed files with 12 additions and 5 deletions
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17
arch/sh/crt_arch.h
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@ -22,7 +22,8 @@ START ": \n"
" mov.l 1f, r5 \n" " mov.l 1f, r5 \n"
" mov.l 1f+4, r6 \n" " mov.l 1f+4, r6 \n"
" add r0, r5 \n" " add r0, r5 \n"
" bsr __fdpic_fixup \n" " mov.l 4f, r1 \n"
"5: bsrf r1 \n"
" add r0, r6 \n" " add r0, r6 \n"
" mov r0, r12 \n" " mov r0, r12 \n"
#endif #endif
@ -31,11 +32,16 @@ START ": \n"
" mov.l r9, @-r15 \n" " mov.l r9, @-r15 \n"
" mov.l r8, @-r15 \n" " mov.l r8, @-r15 \n"
" mov #-16, r0 \n" " mov #-16, r0 \n"
" bsr " START "_c \n" " mov.l 2f, r1 \n"
"3: bsrf r1 \n"
" and r0, r15 \n" " and r0, r15 \n"
".align 2 \n" ".align 2 \n"
"1: .long __ROFIXUP_LIST__@PCREL \n" "1: .long __ROFIXUP_LIST__@PCREL \n"
" .long __ROFIXUP_END__@PCREL + 4 \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 #ifndef SHARED
@ -53,13 +59,14 @@ START ": \n"
" add r0, r5 \n" " add r0, r5 \n"
" mov r15, r4 \n" " mov r15, r4 \n"
" mov #-16, r0 \n" " mov #-16, r0 \n"
" and r0, r15 \n" " mov.l 2f, r1 \n"
" bsr " START "_c \n" "3: bsrf r1 \n"
" nop \n" " and r0, r15 \n"
".align 2 \n" ".align 2 \n"
".weak _DYNAMIC \n" ".weak _DYNAMIC \n"
".hidden _DYNAMIC \n" ".hidden _DYNAMIC \n"
"1: .long _DYNAMIC-. \n" "1: .long _DYNAMIC-. \n"
"2: .long " START "_c@PCREL - (3b+4-.) \n"
); );
#endif #endif