1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2016 SAP SE. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #ifndef CPU_S390_VM_C1_DEFS_S390_HPP
  27 #define CPU_S390_VM_C1_DEFS_S390_HPP
  28 
  29 // Native word offsets from memory address (big endian).
  30 enum {
  31   pd_lo_word_offset_in_bytes = BytesPerInt,
  32   pd_hi_word_offset_in_bytes = 0
  33 };
  34 
  35 // Explicit rounding operations are not required to implement the strictFP mode.
  36 enum {
  37   pd_strict_fp_requires_explicit_rounding = false
  38 };
  39 
  40 // registers
  41 enum {
  42   pd_nof_cpu_regs_frame_map = 16,  // Number of registers used during code emission.
  43   // Treat all registers as caller save (values of callee save are hard to find if caller is in runtime).
  44   // unallocated: Z_thread, Z_fp, Z_SP, Z_R0_scratch, Z_R1_scratch, Z_R14
  45   pd_nof_cpu_regs_unallocated = 6,
  46   pd_nof_caller_save_cpu_regs_frame_map = pd_nof_cpu_regs_frame_map - pd_nof_cpu_regs_unallocated,  // Number of cpu registers killed by calls.
  47   pd_nof_cpu_regs_reg_alloc = pd_nof_caller_save_cpu_regs_frame_map,  // Number of registers that are visible to register allocator.
  48   pd_nof_cpu_regs_linearscan = pd_nof_cpu_regs_frame_map,// Number of registers visible linear scan.
  49   pd_first_cpu_reg = 0,
  50   pd_last_cpu_reg  = 9, // Others are unallocated (see FrameMap::initialize()).
  51 
  52   pd_nof_fpu_regs_frame_map = 16,  // Number of registers used during code emission.
  53   pd_nof_fcpu_regs_unallocated = 1, // Leave Z_F15 unallocated and use it as scratch register.
  54   pd_nof_caller_save_fpu_regs_frame_map = pd_nof_fpu_regs_frame_map - pd_nof_fcpu_regs_unallocated,  // Number of fpu registers killed by calls.
  55   pd_nof_fpu_regs_reg_alloc = pd_nof_caller_save_fpu_regs_frame_map,  // Number of registers that are visible to register allocator.
  56   pd_nof_fpu_regs_linearscan = pd_nof_fpu_regs_frame_map, // Number of registers visible to linear scan.
  57   pd_first_fpu_reg = pd_nof_cpu_regs_frame_map,
  58   pd_last_fpu_reg =  pd_first_fpu_reg + pd_nof_fpu_regs_frame_map - pd_nof_fcpu_regs_unallocated - 1,
  59 
  60   pd_nof_xmm_regs_linearscan = 0,
  61   pd_nof_caller_save_xmm_regs = 0,
  62   pd_first_xmm_reg = -1,
  63   pd_last_xmm_reg = -1
  64 };
  65 
  66 // For debug info: a float value in a register is saved in single precision by runtime stubs.
  67 enum {
  68   pd_float_saved_as_double = false
  69 };
  70 
  71 #endif // CPU_S390_VM_C1_DEFS_S390_HPP