diff options
Diffstat (limited to 'sysdeps/sparc/sparc64/dl-plt.h')
| -rw-r--r-- | sysdeps/sparc/sparc64/dl-plt.h | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/sysdeps/sparc/sparc64/dl-plt.h b/sysdeps/sparc/sparc64/dl-plt.h index e06be43a0a..ca2fe3bbd8 100644 --- a/sysdeps/sparc/sparc64/dl-plt.h +++ b/sysdeps/sparc/sparc64/dl-plt.h @@ -28,7 +28,14 @@ sparc64_fixup_plt (struct link_map *map, const Elf64_Rela *reloc, Elf64_Addr plt_vaddr = (Elf64_Addr) reloc_addr; Elf64_Sxword disp = value - plt_vaddr; - /* Now move plt_vaddr up to the call instruction. */ + /* 't' is '0' if we are resolving this PLT entry for RTLD bootstrap, + in which case we'll be resolving all PLT entries and thus can + optimize by overwriting instructions starting at the first PLT entry + instruction and we need not be mindful of thread safety. + + Otherwise, 't' is '1'. + + Now move plt_vaddr up to the call instruction. */ plt_vaddr += ((t + 1) * 4); /* PLT entries .PLT32768 and above look always the same. */ @@ -39,10 +46,22 @@ sparc64_fixup_plt (struct link_map *map, const Elf64_Rela *reloc, /* Near destination. */ else if (disp >= -0x800000 && disp < 0x800000) { - /* As this is just one instruction, it is thread safe and so - we can avoid the unnecessary sethi FOO, %g1. - b,a target */ - insns[0] = 0x30800000 | ((disp >> 2) & 0x3fffff); + unsigned int insn; + + /* ba,a */ + insn = 0x30800000 | ((disp >> 2) & 0x3fffff); + + if (disp >= -0x100000 && disp < 0x100000) + { + /* ba,a,pt %icc */ + insn = 0x30480000 | ((disp >> 2) & 0x07ffff); + } + + /* As this is just one instruction, it is thread safe and so we + can avoid the unnecessary sethi FOO, %g1. Each 64-bit PLT + entry is 8 instructions long, so we can't run into the 'jmp' + delay slot problems 32-bit PLTs can. */ + insns[0] = insn; __asm __volatile ("flush %0" : : "r" (insns)); } /* 32-bit Sparc style, the target is in the lower 32-bits of |