/*
* Put { move r10, lr; jal ftrace_caller } in a bundle, this lets dynamic
* tracer just add one cycle overhead to every kernel function when disabled.
*/
static unsigned long ftrace_gen_branch(unsigned long pc, unsigned long addr,
bool link)
{
tilegx_bundle_bits opcode_x0, opcode_x1;
long pcrel_by_instr = (addr - pc) >> TILEGX_LOG2_BUNDLE_SIZE_IN_BYTES;
if (link) {
/* opcode: jal addr */
opcode_x1 =
create_Opcode_X1(JUMP_OPCODE_X1) |
create_JumpOpcodeExtension_X1(JAL_JUMP_OPCODE_X1) |
create_JumpOff_X1(pcrel_by_instr);
} else {
/* opcode: j addr */
opcode_x1 =
create_Opcode_X1(JUMP_OPCODE_X1) |
create_JumpOpcodeExtension_X1(J_JUMP_OPCODE_X1) |
create_JumpOff_X1(pcrel_by_instr);
}
/*
* Also put { move r10, lr; jal ftrace_stub } in a bundle, which
* is used to replace the instruction in address ftrace_call.
*/
if (addr == FTRACE_ADDR || addr == (unsigned long)ftrace_stub) {
/* opcode: or r10, lr, zero */
opcode_x0 =
create_Dest_X0(10) |
create_SrcA_X0(TREG_LR) |
create_SrcB_X0(TREG_ZERO) |
create_RRROpcodeExtension_X0(OR_RRR_0_OPCODE_X0) |
create_Opcode_X0(RRR_0_OPCODE_X0);
} else {
/* opcode: fnop */
opcode_x0 =
create_UnaryOpcodeExtension_X0(FNOP_UNARY_OPCODE_X0) |
create_RRROpcodeExtension_X0(UNARY_RRR_0_OPCODE_X0) |
create_Opcode_X0(RRR_0_OPCODE_X0);
}
return opcode_x1 | opcode_x0;
}
static inline tilepro_bundle_bits addi_X1(
tilepro_bundle_bits n, int dest, int src, int imm)
{
n &= ~TILE_X1_MASK;
n |= (create_SrcA_X1(src) |
create_Dest_X1(dest) |
create_Imm8_X1(imm) |
create_S_X1(0) |
create_Opcode_X1(IMM_0_OPCODE_X1) |
create_ImmOpcodeExtension_X1(ADDI_IMM_0_OPCODE_X1));
return n;
}
static inline tile_bundle_bits move_X1(tile_bundle_bits n, int dest, int src)
{
tile_bundle_bits result;
tile_bundle_bits op;
result = n & (~TILE_X1_MASK);
op = create_Opcode_X1(SPECIAL_0_OPCODE_X1) |
create_RRROpcodeExtension_X1(OR_SPECIAL_0_OPCODE_X1) |
create_Dest_X1(dest) |
create_SrcB_X1(TREG_ZERO) |
create_SrcA_X1(src) ;
result |= op;
return result;
}
