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Differential D9407 Diff 24701 libexec/rtld-elf/mips/rtld_start.S

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libexec/rtld-elf/mips/rtld_start.S

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move a0, v1 /* old GP */ move a0, v1 /* old GP */
PTR_SUBU a0, a0, 0x7ff0 /* The offset of $gp from the */ PTR_SUBU a0, a0, 0x7ff0 /* The offset of $gp from the */
/* beginning of the .got section: */ /* beginning of the .got section: */
/* $gp = .got + 0x7ff0, so */ /* $gp = .got + 0x7ff0, so */
/* .got = $gp - 0x7ff0 */ /* .got = $gp - 0x7ff0 */
/* Simple math as you can see. */ /* Simple math as you can see. */
#if defined(__mips_n64) #if defined(__mips_n64)
ld a0, 8(a0) /* object = pltgot[1] */ not t0, zero
and a0, a0, 0x7fffffffffffffff srl t0, 1
sbrunoAuthorUnsubmitted
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This syntax doesn't work with clang. The "fixed" version being proposed (thanks Ed!) compiles with both gcc 4.2 and clang.

sbruno: This syntax doesn't work with clang. The "fixed" version being proposed (thanks Ed!) compiles…
simon.dardis_imgtec.comUnsubmitted
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That immediate is bigger than we normally take. It should be simple enough to extend IAS to accept it for N32 / N64.

simon.dardis_imgtec.com: That immediate is bigger than we normally take. It should be simple enough to extend IAS to…
and a0, a0, t0
brooksUnsubmitted
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In this version there's no load from a0 any more so this is not at all the same thing. You need to restore

ld        a0, 8(a0)                /* object = pltgot[1] */
brooks: In this version there's no load from a0 any more so this is not at all the same thing. You…
sbrunoAuthorUnsubmitted
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Restored ld instruction.

sbruno: Restored ld instruction.
#else #else
lw a0, 4(a0) /* object = pltgot[1] & 0x7fffffff */ lw a0, 4(a0) /* object = pltgot[1] & 0x7fffffff */
and a0, a0, 0x7fffffff and a0, a0, 0x7fffffff
#endif #endif
move a1, t8 /* symbol index */ move a1, t8 /* symbol index */
PTR_LA t9, _C_LABEL(_mips_rtld_bind) PTR_LA t9, _C_LABEL(_mips_rtld_bind)
jalr t9 jalr t9
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