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| author | Jan Beulich <JBeulich@suse.com> | 2014-11-04 09:50:18 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2014-11-04 20:43:14 +0100 |
| commit | 6d24c5f72dfb26e5fa7f02fa9266dfdbae41adba (patch) | |
| tree | 02a65c8228a6a6bfc0e0c89c6c749e491b2bda8b /arch/x86/tools | |
| parent | x86: Convert a few more per-CPU items to read-mostly ones (diff) | |
| download | linux-6d24c5f72dfb26e5fa7f02fa9266dfdbae41adba.tar.xz linux-6d24c5f72dfb26e5fa7f02fa9266dfdbae41adba.zip | |
x86-64: Handle PC-relative relocations on per-CPU data
This is in preparation of using RIP-relative addressing in many of the
per-CPU accesses.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Link: http://lkml.kernel.org/r/5458A15A0200007800044A9A@mail.emea.novell.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/tools')
| -rw-r--r-- | arch/x86/tools/relocs.c | 36 |
1 files changed, 27 insertions, 9 deletions
diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c index a5efb21d5228..0c2fae8d929d 100644 --- a/arch/x86/tools/relocs.c +++ b/arch/x86/tools/relocs.c @@ -20,7 +20,10 @@ struct relocs { static struct relocs relocs16; static struct relocs relocs32; +#if ELF_BITS == 64 +static struct relocs relocs32neg; static struct relocs relocs64; +#endif struct section { Elf_Shdr shdr; @@ -762,11 +765,16 @@ static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym, switch (r_type) { case R_X86_64_NONE: + /* NONE can be ignored. */ + break; + case R_X86_64_PC32: /* - * NONE can be ignored and PC relative relocations don't - * need to be adjusted. + * PC relative relocations don't need to be adjusted unless + * referencing a percpu symbol. */ + if (is_percpu_sym(sym, symname)) + add_reloc(&relocs32neg, offset); break; case R_X86_64_32: @@ -986,7 +994,10 @@ static void emit_relocs(int as_text, int use_real_mode) /* Order the relocations for more efficient processing */ sort_relocs(&relocs16); sort_relocs(&relocs32); +#if ELF_BITS == 64 + sort_relocs(&relocs32neg); sort_relocs(&relocs64); +#endif /* Print the relocations */ if (as_text) { @@ -1007,14 +1018,21 @@ static void emit_relocs(int as_text, int use_real_mode) for (i = 0; i < relocs32.count; i++) write_reloc(relocs32.offset[i], stdout); } else { - if (ELF_BITS == 64) { - /* Print a stop */ - write_reloc(0, stdout); +#if ELF_BITS == 64 + /* Print a stop */ + write_reloc(0, stdout); - /* Now print each relocation */ - for (i = 0; i < relocs64.count; i++) - write_reloc(relocs64.offset[i], stdout); - } + /* Now print each relocation */ + for (i = 0; i < relocs64.count; i++) + write_reloc(relocs64.offset[i], stdout); + + /* Print a stop */ + write_reloc(0, stdout); + + /* Now print each inverse 32-bit relocation */ + for (i = 0; i < relocs32neg.count; i++) + write_reloc(relocs32neg.offset[i], stdout); +#endif /* Print a stop */ write_reloc(0, stdout); |