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authorRalf Baechle <ralf@linux-mips.org>2014-04-29 15:21:24 +0200
committerRalf Baechle <ralf@linux-mips.org>2014-05-23 15:12:37 +0200
commit76fbfc318de2eb0eb4823095ece020f999a17c63 (patch)
tree376004537e00adf3459c1e32a5ba82b5692a6a9f /arch/mips/math-emu
parent377cb1b6c16a17e2560a9288f9c8ed5dcdbeba39 (diff)
downloadlinux-76fbfc318de2eb0eb4823095ece020f999a17c63.tar.gz
MIPS: Sort out mm_isBranchInstr.
mm_isBranchInstr() did reside in the math emu code even though it logically is separate and also is used outside the math emu code. In addition GCC 4.9.0 leaves the following unnnecessarily bloated function body for a non-microMIPS configuration: <mm_isBranchInstr>: 105c: afa50004 sw a1,4(sp) 1060: afa60008 sw a2,8(sp) 1064: afa7000c sw a3,12(sp) 1068: 03e00008 jr ra 106c: 00001021 move v0,zero which stores arguments that are never going to be used on the stack frame. Move mm_isBranchInstr() from cp1emu.c to branch.c, then split mm_isBranchInstr() into a __mm_isBranchInstr() core and a mm_isBranchInstr() wrapper inline function which only invokes __mm_isBranchInstr() on microMIPS configurations. This shaves off 112 bytes off the kernel and improves code flow a bit. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/math-emu')
-rw-r--r--arch/mips/math-emu/cp1emu.c201
1 files changed, 0 insertions, 201 deletions
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index 6258291354eb..b31ce6cdb6b9 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -67,11 +67,6 @@ static int fpux_emu(struct pt_regs *,
/* Determine rounding mode from the RM bits of the FCSR */
#define modeindex(v) ((v) & FPU_CSR_RM)
-/* microMIPS bitfields */
-#define MM_POOL32A_MINOR_MASK 0x3f
-#define MM_POOL32A_MINOR_SHIFT 0x6
-#define MM_MIPS32_COND_FC 0x30
-
/* Convert MIPS rounding mode (0..3) to IEEE library modes. */
static const unsigned char ieee_rm[4] = {
[FPU_CSR_RN] = IEEE754_RN,
@@ -99,9 +94,6 @@ static const unsigned int fpucondbit[8] = {
FPU_CSR_COND7
};
-/* (microMIPS) Convert 16-bit register encoding to 32-bit register encoding. */
-static const unsigned int reg16to32map[8] = {16, 17, 2, 3, 4, 5, 6, 7};
-
/* (microMIPS) Convert certain microMIPS instructions to MIPS32 format. */
static const int sd_format[] = {16, 17, 0, 0, 0, 0, 0, 0};
static const int sdps_format[] = {16, 17, 22, 0, 0, 0, 0, 0};
@@ -449,199 +441,6 @@ static int microMIPS32_to_MIPS32(union mips_instruction *insn_ptr)
return 0;
}
-int mm_isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn,
- unsigned long *contpc)
-{
- union mips_instruction insn = (union mips_instruction)dec_insn.insn;
- int bc_false = 0;
- unsigned int fcr31;
- unsigned int bit;
-
- if (!cpu_has_mmips)
- return 0;
-
- switch (insn.mm_i_format.opcode) {
- case mm_pool32a_op:
- if ((insn.mm_i_format.simmediate & MM_POOL32A_MINOR_MASK) ==
- mm_pool32axf_op) {
- switch (insn.mm_i_format.simmediate >>
- MM_POOL32A_MINOR_SHIFT) {
- case mm_jalr_op:
- case mm_jalrhb_op:
- case mm_jalrs_op:
- case mm_jalrshb_op:
- if (insn.mm_i_format.rt != 0) /* Not mm_jr */
- regs->regs[insn.mm_i_format.rt] =
- regs->cp0_epc +
- dec_insn.pc_inc +
- dec_insn.next_pc_inc;
- *contpc = regs->regs[insn.mm_i_format.rs];
- return 1;
- }
- }
- break;
- case mm_pool32i_op:
- switch (insn.mm_i_format.rt) {
- case mm_bltzals_op:
- case mm_bltzal_op:
- regs->regs[31] = regs->cp0_epc +
- dec_insn.pc_inc +
- dec_insn.next_pc_inc;
- /* Fall through */
- case mm_bltz_op:
- if ((long)regs->regs[insn.mm_i_format.rs] < 0)
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc +
- (insn.mm_i_format.simmediate << 1);
- else
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc +
- dec_insn.next_pc_inc;
- return 1;
- case mm_bgezals_op:
- case mm_bgezal_op:
- regs->regs[31] = regs->cp0_epc +
- dec_insn.pc_inc +
- dec_insn.next_pc_inc;
- /* Fall through */
- case mm_bgez_op:
- if ((long)regs->regs[insn.mm_i_format.rs] >= 0)
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc +
- (insn.mm_i_format.simmediate << 1);
- else
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc +
- dec_insn.next_pc_inc;
- return 1;
- case mm_blez_op:
- if ((long)regs->regs[insn.mm_i_format.rs] <= 0)
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc +
- (insn.mm_i_format.simmediate << 1);
- else
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc +
- dec_insn.next_pc_inc;
- return 1;
- case mm_bgtz_op:
- if ((long)regs->regs[insn.mm_i_format.rs] <= 0)
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc +
- (insn.mm_i_format.simmediate << 1);
- else
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc +
- dec_insn.next_pc_inc;
- return 1;
- case mm_bc2f_op:
- case mm_bc1f_op:
- bc_false = 1;
- /* Fall through */
- case mm_bc2t_op:
- case mm_bc1t_op:
- preempt_disable();
- if (is_fpu_owner())
- asm volatile("cfc1\t%0,$31" : "=r" (fcr31));
- else
- fcr31 = current->thread.fpu.fcr31;
- preempt_enable();
-
- if (bc_false)
- fcr31 = ~fcr31;
-
- bit = (insn.mm_i_format.rs >> 2);
- bit += (bit != 0);
- bit += 23;
- if (fcr31 & (1 << bit))
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc +
- (insn.mm_i_format.simmediate << 1);
- else
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc + dec_insn.next_pc_inc;
- return 1;
- }
- break;
- case mm_pool16c_op:
- switch (insn.mm_i_format.rt) {
- case mm_jalr16_op:
- case mm_jalrs16_op:
- regs->regs[31] = regs->cp0_epc +
- dec_insn.pc_inc + dec_insn.next_pc_inc;
- /* Fall through */
- case mm_jr16_op:
- *contpc = regs->regs[insn.mm_i_format.rs];
- return 1;
- }
- break;
- case mm_beqz16_op:
- if ((long)regs->regs[reg16to32map[insn.mm_b1_format.rs]] == 0)
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc +
- (insn.mm_b1_format.simmediate << 1);
- else
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc + dec_insn.next_pc_inc;
- return 1;
- case mm_bnez16_op:
- if ((long)regs->regs[reg16to32map[insn.mm_b1_format.rs]] != 0)
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc +
- (insn.mm_b1_format.simmediate << 1);
- else
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc + dec_insn.next_pc_inc;
- return 1;
- case mm_b16_op:
- *contpc = regs->cp0_epc + dec_insn.pc_inc +
- (insn.mm_b0_format.simmediate << 1);
- return 1;
- case mm_beq32_op:
- if (regs->regs[insn.mm_i_format.rs] ==
- regs->regs[insn.mm_i_format.rt])
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc +
- (insn.mm_i_format.simmediate << 1);
- else
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc +
- dec_insn.next_pc_inc;
- return 1;
- case mm_bne32_op:
- if (regs->regs[insn.mm_i_format.rs] !=
- regs->regs[insn.mm_i_format.rt])
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc +
- (insn.mm_i_format.simmediate << 1);
- else
- *contpc = regs->cp0_epc +
- dec_insn.pc_inc + dec_insn.next_pc_inc;
- return 1;
- case mm_jalx32_op:
- regs->regs[31] = regs->cp0_epc +
- dec_insn.pc_inc + dec_insn.next_pc_inc;
- *contpc = regs->cp0_epc + dec_insn.pc_inc;
- *contpc >>= 28;
- *contpc <<= 28;
- *contpc |= (insn.j_format.target << 2);
- return 1;
- case mm_jals32_op:
- case mm_jal32_op:
- regs->regs[31] = regs->cp0_epc +
- dec_insn.pc_inc + dec_insn.next_pc_inc;
- /* Fall through */
- case mm_j32_op:
- *contpc = regs->cp0_epc + dec_insn.pc_inc;
- *contpc >>= 27;
- *contpc <<= 27;
- *contpc |= (insn.j_format.target << 1);
- set_isa16_mode(*contpc);
- return 1;
- }
- return 0;
-}
-
/*
* Redundant with logic already in kernel/branch.c,
* embedded in compute_return_epc. At some point,