diff options
Diffstat (limited to 'gcc/config/xtensa/xtensa.md')
| -rw-r--r-- | gcc/config/xtensa/xtensa.md | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md index d5596e25d82..0eba10b742c 100644 --- a/gcc/config/xtensa/xtensa.md +++ b/gcc/config/xtensa/xtensa.md @@ -38,6 +38,7 @@ (UNSPEC_MEMW 11) (UNSPEC_LSETUP_START 12) (UNSPEC_LSETUP_END 13) + (UNSPEC_FRAME_BLOCKAGE 14) (UNSPECV_SET_FP 1) (UNSPECV_ENTRY 2) @@ -1676,6 +1677,32 @@ ;; Miscellaneous instructions. +;; In windowed ABI stack pointer adjustment must happen before any access +;; to the space allocated on stack is allowed, otherwise register spill +;; area may be clobbered. That's what frame blockage is supposed to enforce. + +(define_expand "allocate_stack" + [(set (match_operand 0 "nonimmed_operand") + (minus (reg A1_REG) (match_operand 1 "add_operand"))) + (set (reg A1_REG) + (minus (reg A1_REG) (match_dup 1)))] + "TARGET_WINDOWED_ABI" +{ + if (CONST_INT_P (operands[1])) + { + rtx neg_op0 = GEN_INT (-INTVAL (operands[1])); + emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx, neg_op0)); + } + else + { + emit_insn (gen_subsi3 (stack_pointer_rtx, stack_pointer_rtx, + operands[1])); + } + emit_move_insn (operands[0], virtual_stack_dynamic_rtx); + emit_insn (gen_frame_blockage ()); + DONE; +}) + (define_expand "prologue" [(const_int 0)] "" @@ -1767,6 +1794,25 @@ [(set_attr "length" "0") (set_attr "type" "nop")]) +;; Do not schedule instructions accessing memory before this point. + +(define_expand "frame_blockage" + [(set (match_dup 0) + (unspec:BLK [(match_dup 1)] UNSPEC_FRAME_BLOCKAGE))] + "" +{ + operands[0] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode)); + MEM_VOLATILE_P (operands[0]) = 1; + operands[1] = stack_pointer_rtx; +}) + +(define_insn "*frame_blockage" + [(set (match_operand:BLK 0 "" "") + (unspec:BLK [(match_operand:SI 1 "" "")] UNSPEC_FRAME_BLOCKAGE))] + "" + "" + [(set_attr "length" "0")]) + (define_insn "trap" [(trap_if (const_int 1) (const_int 0))] "" |