On Fri, Nov 15, 2002 at 01:16:45PM +0000, Russell King wrote:
> I'm slightly worried about this. For things like shared libraries to be
> relocatable on ARM on current toolchains, you need to build with -fPIC.
Err, no you don't. You only need that if you want to share pages,
which is clearly not an issue with kernel modules. There are no
restrictions of which I am aware that require ARM to build with -fpic.
My test case,
int i;
int foo() { return bar() + i; }
int j __attribute__((section(".init.data")));
int __attribute__((section(".init.text")))
baz() { return i + j; }
works exactly as desired on ARM:
Disassembly of section .text:
00000000 <foo>:
0: e52de004 str lr, [sp, -#4]!
4: ebfffffe bl 4 <foo+0x4>
8: e59f3008 ldr r3, [pc, #8] ; 18 <foo+0x18>
c: e5933000 ldr r3, [r3]
10: e0800003 add r0, r0, r3
14: e49df004 ldr pc, [sp], #4
Disassembly of section .init.text:
00001000 <baz>:
1000: e59f3010 ldr r3, [pc, #16] ; 1018 <baz+0x18>
1004: e5930000 ldr r0, [r3]
1008: e59f300c ldr r3, [pc, #12] ; 101c <baz+0x1c>
100c: e5933000 ldr r3, [r3]
1010: e0800003 add r0, r0, r3
1014: e1a0f00e mov pc, lr
Relocation section '.rel.dyn' at offset 0x11258 contains 4 entries:
Offset Info Type Sym.Value Sym. Name
00000004 00001501 R_ARM_PC24 00000000 bar
00000018 00001202 R_ARM_ABS32 00000040 i
00001018 00001202 R_ARM_ABS32 00000040 i
0000101c 00000f02 R_ARM_ABS32 00001020 j
r~
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This archive was generated by hypermail 2b29 : Fri Nov 15 2002 - 22:00:39 EST