}
return align;
}
+\f
+/* Emit RTL insns to initialize the variable parts of a trampoline.
+ FNADDR is an RTX for the address of the function's pure code.
+ CXT is an RTX for the static chain value for the function. */
+void
+x86_initialize_trampoline (tramp, fnaddr, cxt)
+ rtx tramp, fnaddr, cxt;
+{
+ if (!TARGET_64BIT)
+ {
+ /* Compute offset from the end of the jmp to the target function. */
+ rtx disp = expand_binop (SImode, sub_optab, fnaddr,
+ plus_constant (tramp, 10),
+ NULL_RTX, 1, OPTAB_DIRECT);
+ emit_move_insn (gen_rtx_MEM (QImode, tramp),
+ GEN_INT (trunc_int_for_mode (0xb9, QImode)));
+ emit_move_insn (gen_rtx_MEM (SImode, plus_constant (tramp, 1)), cxt);
+ emit_move_insn (gen_rtx_MEM (QImode, plus_constant (tramp, 5)),
+ GEN_INT (trunc_int_for_mode (0xe9, QImode)));
+ emit_move_insn (gen_rtx_MEM (SImode, plus_constant (tramp, 6)), disp);
+ }
+ else
+ {
+ int offset = 0;
+ /* Try to load address using shorter movl instead of movabs.
+ We may want to support movq for kernel mode, but kernel does not use
+ trampolines at the moment. */
+ if (x86_64_zero_extended_value (fnaddr))
+ {
+ fnaddr = copy_to_mode_reg (DImode, fnaddr);
+ emit_move_insn (gen_rtx_MEM (HImode, plus_constant (tramp, offset)),
+ GEN_INT (trunc_int_for_mode (0xbb41, HImode)));
+ emit_move_insn (gen_rtx_MEM (SImode, plus_constant (tramp, offset + 2)),
+ gen_lowpart (SImode, fnaddr));
+ offset += 6;
+ }
+ else
+ {
+ emit_move_insn (gen_rtx_MEM (HImode, plus_constant (tramp, offset)),
+ GEN_INT (trunc_int_for_mode (0xbb49, HImode)));
+ emit_move_insn (gen_rtx_MEM (DImode, plus_constant (tramp, offset + 2)),
+ fnaddr);
+ offset += 10;
+ }
+ /* Load static chain using movabs to r10. */
+ emit_move_insn (gen_rtx_MEM (HImode, plus_constant (tramp, offset)),
+ GEN_INT (trunc_int_for_mode (0xba49, HImode)));
+ emit_move_insn (gen_rtx_MEM (DImode, plus_constant (tramp, offset + 2)),
+ cxt);
+ offset += 10;
+ /* Jump to the r11 */
+ emit_move_insn (gen_rtx_MEM (HImode, plus_constant (tramp, offset)),
+ GEN_INT (trunc_int_for_mode (0xff49, HImode)));
+ emit_move_insn (gen_rtx_MEM (QImode, plus_constant (tramp, offset+2)),
+ GEN_INT (trunc_int_for_mode (0xe3, HImode)));
+ offset += 3;
+ if (offset > TRAMPOLINE_SIZE)
+ abort();
+ }
+}
#define def_builtin(NAME, TYPE, CODE) \
builtin_function ((NAME), (TYPE), (CODE), BUILT_IN_MD, NULL_PTR)