arch/mips/math-emu/cp1emu.c

Source file repositories/reference/linux-study-clean/arch/mips/math-emu/cp1emu.c

File Facts

System
Linux kernel
Corpus path
arch/mips/math-emu/cp1emu.c
Extension
.c
Size
71695 bytes
Lines
2949
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

switch (insn.mm_fp0_format.func) {
		case mm_32f_01_op:
		case mm_32f_11_op:
		case mm_32f_02_op:
		case mm_32f_12_op:
		case mm_32f_41_op:
		case mm_32f_51_op:
		case mm_32f_42_op:
		case mm_32f_52_op:
			op = insn.mm_fp0_format.func;
			if (op == mm_32f_01_op)
				func = madd_s_op;
			else if (op == mm_32f_11_op)
				func = madd_d_op;
			else if (op == mm_32f_02_op)
				func = nmadd_s_op;
			else if (op == mm_32f_12_op)
				func = nmadd_d_op;
			else if (op == mm_32f_41_op)
				func = msub_s_op;
			else if (op == mm_32f_51_op)
				func = msub_d_op;
			else if (op == mm_32f_42_op)
				func = nmsub_s_op;
			else
				func = nmsub_d_op;
			mips32_insn.fp6_format.opcode = cop1x_op;
			mips32_insn.fp6_format.fr = insn.mm_fp6_format.fr;
			mips32_insn.fp6_format.ft = insn.mm_fp6_format.ft;
			mips32_insn.fp6_format.fs = insn.mm_fp6_format.fs;
			mips32_insn.fp6_format.fd = insn.mm_fp6_format.fd;
			mips32_insn.fp6_format.func = func;
			break;
		case mm_32f_10_op:
			func = -1;	/* Invalid */
			op = insn.mm_fp5_format.op & 0x7;
			if (op == mm_ldxc1_op)
				func = ldxc1_op;
			else if (op == mm_sdxc1_op)
				func = sdxc1_op;
			else if (op == mm_lwxc1_op)
				func = lwxc1_op;
			else if (op == mm_swxc1_op)
				func = swxc1_op;

			if (func != -1) {
				mips32_insn.r_format.opcode = cop1x_op;
				mips32_insn.r_format.rs =
					insn.mm_fp5_format.base;
				mips32_insn.r_format.rt =
					insn.mm_fp5_format.index;
				mips32_insn.r_format.rd = 0;
				mips32_insn.r_format.re = insn.mm_fp5_format.fd;
				mips32_insn.r_format.func = func;
			} else
				return SIGILL;
			break;
		case mm_32f_40_op:
			op = -1;	/* Invalid */
			if (insn.mm_fp2_format.op == mm_fmovt_op)
				op = 1;
			else if (insn.mm_fp2_format.op == mm_fmovf_op)
				op = 0;
			if (op != -1) {
				mips32_insn.fp0_format.opcode = cop1_op;
				mips32_insn.fp0_format.fmt =
					sdps_format[insn.mm_fp2_format.fmt];
				mips32_insn.fp0_format.ft =
					(insn.mm_fp2_format.cc<<2) + op;
				mips32_insn.fp0_format.fs =
					insn.mm_fp2_format.fs;
				mips32_insn.fp0_format.fd =
					insn.mm_fp2_format.fd;
				mips32_insn.fp0_format.func = fmovc_op;
			} else
				return SIGILL;
			break;
		case mm_32f_60_op:
			func = -1;	/* Invalid */
			if (insn.mm_fp0_format.op == mm_fadd_op)
				func = fadd_op;
			else if (insn.mm_fp0_format.op == mm_fsub_op)
				func = fsub_op;
			else if (insn.mm_fp0_format.op == mm_fmul_op)
				func = fmul_op;
			else if (insn.mm_fp0_format.op == mm_fdiv_op)
				func = fdiv_op;
			if (func != -1) {
				mips32_insn.fp0_format.opcode = cop1_op;
				mips32_insn.fp0_format.fmt =

Annotation

Implementation Notes