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tcg-ppc64: Adjust tcg_out_call for ELFv2 

The new ELFv2 ABI, used by default on powerpc64le-linux hosts,
introduced some changes that are incompatible with code currently
generated by the ppc64 TGC target.  In particular, we no longer
use function descriptors.

This patch adds support for the ELFv2 ABI in the ppc64 TGC
function call and function prologue sequences.

Tested-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Ulrich Weigand 2014-04-30 14:33:05 -07:00 committed by Richard Henderson
parent a2a98f807b
commit 77e58d0d60
1 changed files with 17 additions and 0 deletions
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17
tcg/ppc64/tcg-target.c
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@ -1115,6 +1115,23 @@ static void tcg_out_call(TCGContext *s, tcg_insn_unit *target)
tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_R2, TCG_REG_R2, ofs + SZP);
tcg_out32(s, BCCTR | BO_ALWAYS | LK);
}
#elif defined(_CALL_ELF) && _CALL_ELF == 2
intptr_t diff;
/* In the ELFv2 ABI, we have to set up r12 to contain the destination
address, which the callee uses to compute its TOC address. */
/* FIXME: when the branch is in range, we could avoid r12 load if we
knew that the destination uses the same TOC, and what its local
entry point offset is. */
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R12, (intptr_t)target);
diff = tcg_pcrel_diff(s, target);
if (in_range_b(diff)) {
tcg_out_b(s, LK, target);
} else {
tcg_out32(s, MTSPR | RS(TCG_REG_R12) | CTR);
tcg_out32(s, BCCTR | BO_ALWAYS | LK);
}
#else
tcg_out_b(s, LK, target);
#endif