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2014-11-04 Jiong Wang <jiong.wang@arm.com>
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Wilco Dijkstra <wilco.dijkstra@arm.com>
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PR target/63293
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* config/aarch64/aarch64.c (aarch64_expand_epiloue): Add barriers before
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stack adjustment.
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--- gcc/config/aarch64/aarch64.c (revision 217090)
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+++ gcc/config/aarch64/aarch64.c (revision 217091)
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@@ -1989,6 +1989,9 @@ aarch64_expand_epilogue (bool for_sibcal
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rtx insn;
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rtx cfa_reg;
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rtx cfi_ops = NULL;
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+ /* We need to add memory barrier to prevent read from deallocated stack. */
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+ bool need_barrier_p = (get_frame_size () != 0
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+ || cfun->machine->saved_varargs_size);
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aarch64_layout_frame ();
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original_frame_size = get_frame_size () + cfun->machine->saved_varargs_size;
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@@ -2030,6 +2033,9 @@ aarch64_expand_epilogue (bool for_sibcal
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if (frame_pointer_needed
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&& (crtl->outgoing_args_size || cfun->calls_alloca))
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{
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+ if (cfun->calls_alloca)
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+ emit_insn (gen_stack_tie (stack_pointer_rtx, stack_pointer_rtx));
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+
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insn = emit_insn (gen_add3_insn (stack_pointer_rtx,
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hard_frame_pointer_rtx,
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GEN_INT (- fp_offset)));
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@@ -2048,6 +2054,9 @@ aarch64_expand_epilogue (bool for_sibcal
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/* Restore the frame pointer and lr if the frame pointer is needed. */
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if (offset > 0)
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{
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+ if (need_barrier_p && (!frame_pointer_needed || !fp_offset))
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+ emit_insn (gen_stack_tie (stack_pointer_rtx, stack_pointer_rtx));
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+
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if (frame_pointer_needed)
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{
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rtx mem_fp, mem_lr;
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@@ -2067,6 +2076,10 @@ aarch64_expand_epilogue (bool for_sibcal
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+ UNITS_PER_WORD));
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emit_insn (gen_load_pairdi (reg_fp, mem_fp, reg_lr, mem_lr));
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+ if (need_barrier_p)
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+ emit_insn (gen_stack_tie (stack_pointer_rtx,
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+ stack_pointer_rtx));
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+
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insn = emit_insn (gen_add2_insn (stack_pointer_rtx,
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GEN_INT (offset)));
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}
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@@ -2128,6 +2141,9 @@ aarch64_expand_epilogue (bool for_sibcal
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if (frame_size > -1)
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{
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+ if (need_barrier_p)
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+ emit_insn (gen_stack_tie (stack_pointer_rtx, stack_pointer_rtx));
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+
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if (frame_size >= 0x1000000)
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{
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rtx op0 = gen_rtx_REG (Pmode, IP0_REGNUM);
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