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//===-- MipsNaClHeaders.cpp - Print SFI headers to an Mips .s file --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the initial header string needed
// for the Native Client target in Mips assembly.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/raw_ostream.h"
#include "MipsNaClRewritePass.h"
#include <string>
using namespace llvm;
void EmitMipsSFIHeaders(raw_ostream &O) {
O << " # ========================================\n";
O << "# Branch: " << FlagSfiBranch << "\n";
O << "# Stack: " << FlagSfiStack << "\n";
O << "# Store: " << FlagSfiStore << "\n";
O << "# Load: " << FlagSfiLoad << "\n";
O << " # ========================================\n";
// NOTE: this macro does bundle alignment as follows
// if current bundle pos is X emit pX data items of value "val"
// NOTE: that pos will be one of: 0,4,8,12
//
O <<
"\t.macro sfi_long_based_on_pos p0 p1 p2 p3 val\n"
"\t.set pos, (. - XmagicX) % 16\n"
"\t.fill (((\\p3<<12)|(\\p2<<8)|(\\p1<<4)|\\p0)>>pos) & 15, 4, \\val\n"
"\t.endm\n"
"\n\n";
O <<
"\t.macro sfi_nop_if_at_bundle_end\n"
"\tsfi_long_based_on_pos 0 0 0 1 0x00000000\n"
"\t.endm\n"
"\n\n";
O <<
"\t.macro sfi_nops_to_force_slot3\n"
"\tsfi_long_based_on_pos 3 2 1 0 0x00000000\n"
"\t.endm\n"
"\n\n";
O <<
"\t.macro sfi_nops_to_force_slot2\n"
"\tsfi_long_based_on_pos 2 1 0 3 0x00000000\n"
"\t.endm\n"
"\n\n";
O <<
"\t.macro sfi_nops_to_force_slot1\n"
"\tsfi_long_based_on_pos 1 0 3 2 0x00000000\n"
"\t.endm\n"
"\n\n";
O << " # ========================================\n";
O <<
"\t.macro sfi_data_mask reg1 reg2 maskreg\n"
"\tand \\reg1, \\reg2, \\maskreg\n"
"\t.endm\n"
"\n\n";
O <<
"\t.macro sfi_code_mask reg1 reg2 maskreg\n"
"\tand \\reg1, \\reg2, \\maskreg\n"
"\t.endm\n"
"\n\n";
O << " # ========================================\n";
if (FlagSfiBranch) {
O <<
"\t.macro sfi_call_preamble\n"
"\tsfi_nops_to_force_slot2\n"
"\t.endm\n"
"\n\n";
O <<
"\t.macro sfi_return_preamble reg1 reg2 maskreg\n"
"\tsfi_nop_if_at_bundle_end\n"
"\tsfi_code_mask \\reg1, \\reg2, \\maskreg\n"
"\t.endm\n"
"\n\n";
// This is used just before "jr"
O <<
"\t.macro sfi_indirect_jump_preamble reg1 reg2 maskreg\n"
"\tsfi_nop_if_at_bundle_end\n"
"\tsfi_code_mask \\reg1, \\reg2, \\maskreg\n"
"\t.endm\n"
"\n\n";
// This is used just before "jalr"
O <<
"\t.macro sfi_indirect_call_preamble reg1 reg2 maskreg\n"
"\tsfi_nops_to_force_slot1\n"
"\tsfi_code_mask \\reg1, \\reg2, \\maskreg\n"
"\t.endm\n"
"\n\n";
}
if (FlagSfiStore) {
O << " # ========================================\n";
O <<
"\t.macro sfi_load_store_preamble reg1 reg2 maskreg\n"
"\tsfi_nop_if_at_bundle_end\n"
"\tsfi_data_mask \\reg1, \\reg2 , \\maskreg\n"
"\t.endm\n"
"\n\n";
} else {
O <<
"\t.macro sfi_load_store_preamble reg1 reg2 maskreg\n"
"\t.endm\n"
"\n\n";
}
O << " # ========================================\n";
O << "\t.text\n";
}
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