I’m wondering if the alignment is the traditional ARM vs Thumb 2. The movw after lint_begin with hex 0xe30b3eef is a Thumb 2 instruction.
- Michael On Sep 26, 2013, at 9:24 AM, Oliver Hunt <oli...@apple.com> wrote: > I believe that there’s a mnemonic that forces alignment that we could > (arguably should?) be using before these labels. > > IIRC it’s something like .align N — if we aren’t doing this already we could > make the lint assembler backend emit a .align 16 prior to each global symbol. > > —Oliver > > On Sep 26, 2013, at 1:09 AM, Gabor Rapcsanyi <rga...@inf.u-szeged.hu> wrote: > >> Hello! >> >> I'm fighting with a strange LLInt alignment problem on ARM. As I see we put >> the LLInt code into .rodata section instead of .text. >> Is there a specific reason why we are doing this? If there is not I would >> put them to the .text section. >> >> Here is the objdump: >> >> ./Source/JavaScriptCore/.obj/release-shared/llint/LowLevelInterpreter.o: >> file format elf32-littlearm >> >> Disassembly of section .rodata: >> >> 00000000 <_ZStL19piecewise_construct>: >> 0: 00000000 andeq r0, r0, r0 >> >> 00000004 <_ZStL13allocator_arg>: >> 4: 00000000 andeq r0, r0, r0 >> >> 00000008 <_ZStL6ignore>: >> ... >> >> 00000009 <llint_begin>: >> 9: e30b3eef movw r3, #48879 ; 0xbeef >> d: e34b3bad movt r3, #48045 ; 0xbbad >> 11: e5830000 str r0, [r3] >> 15: e3a00000 mov r0, #0 >> 19: e12fff30 blx r0 >> >> 0000001d <llint_program_prologue>: >> 1d: e1a0200e mov r2, lr >> 21: e5852010 str r2, [r5, #16] >> 25: e5951008 ldr r1, [r5, #8] >> ... >> >> >> The problem is that these traditional instructions are lying on odd adresses >> in the .rodata section. >> >> Regards, >> Gabor >> >> _______________________________________________ >> webkit-dev mailing list >> webkit-dev@lists.webkit.org >> https://lists.webkit.org/mailman/listinfo/webkit-dev > > _______________________________________________ > webkit-dev mailing list > webkit-dev@lists.webkit.org > https://lists.webkit.org/mailman/listinfo/webkit-dev _______________________________________________ webkit-dev mailing list webkit-dev@lists.webkit.org https://lists.webkit.org/mailman/listinfo/webkit-dev
