99 lines
4.4 KiB
C
99 lines
4.4 KiB
C
// Based on code by Schuyler Eldridge. Copyright (c) Boston University
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// https://github.com/seldridge/rocket-rocc-examples/blob/master/src/main/c/rocc.h
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#ifndef SRC_MAIN_C_ROCC_H
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#define SRC_MAIN_C_ROCC_H
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#include <stdint.h>
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#define STR1(x) #x
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#define STR(x) STR1(x)
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#define EXTRACT(a, size, offset) (((~(~0 << size) << offset) & a) >> offset)
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#define CUSTOMX_OPCODE(x) CUSTOM_ ## x
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#define CUSTOM_0 0b0001011
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#define CUSTOM_1 0b0101011
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#define CUSTOM_2 0b1011011
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#define CUSTOM_3 0b1111011
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#define CUSTOMX(X, xd, xs1, xs2, rd, rs1, rs2, funct) \
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CUSTOMX_OPCODE(X) | \
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(rd << (7)) | \
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(xs2 << (7+5)) | \
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(xs1 << (7+5+1)) | \
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(xd << (7+5+2)) | \
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(rs1 << (7+5+3)) | \
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(rs2 << (7+5+3+5)) | \
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(EXTRACT(funct, 7, 0) << (7+5+3+5+5))
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// Standard macro that passes rd, rs1, and rs2 via registers
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#define ROCC_INSTRUCTION_DSS(X, rd, rs1, rs2, funct) \
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ROCC_INSTRUCTION_R_R_R(X, rd, rs1, rs2, funct, 10, 11, 12)
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#define ROCC_INSTRUCTION_DS(X, rd, rs1, funct) \
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ROCC_INSTRUCTION_R_R_I(X, rd, rs1, 0, funct, 10, 11)
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#define ROCC_INSTRUCTION_D(X, rd, funct) \
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ROCC_INSTRUCTION_R_I_I(X, rd, 0, 0, funct, 10)
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#define ROCC_INSTRUCTION_SS(X, rs1, rs2, funct) \
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ROCC_INSTRUCTION_I_R_R(X, 0, rs1, rs2, funct, 11, 12)
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#define ROCC_INSTRUCTION_S(X, rs1, funct) \
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ROCC_INSTRUCTION_I_R_I(X, 0, rs1, 0, funct, 11)
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#define ROCC_INSTRUCTION(X, funct) \
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ROCC_INSTRUCTION_I_I_I(X, 0, 0, 0, funct)
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// rd, rs1, and rs2 are data
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// rd_n, rs_1, and rs2_n are the register numbers to use
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#define ROCC_INSTRUCTION_R_R_R(X, rd, rs1, rs2, funct, rd_n, rs1_n, rs2_n) { \
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register uint64_t rd_ asm ("x" # rd_n); \
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register uint64_t rs1_ asm ("x" # rs1_n) = (uint64_t) rs1; \
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register uint64_t rs2_ asm ("x" # rs2_n) = (uint64_t) rs2; \
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asm volatile ( \
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".word " STR(CUSTOMX(X, 1, 1, 1, rd_n, rs1_n, rs2_n, funct)) "\n\t" \
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: "=r" (rd_) \
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: [_rs1] "r" (rs1_), [_rs2] "r" (rs2_)); \
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rd = rd_; \
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}
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#define ROCC_INSTRUCTION_R_R_I(X, rd, rs1, rs2, funct, rd_n, rs1_n) { \
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register uint64_t rd_ asm ("x" # rd_n); \
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register uint64_t rs1_ asm ("x" # rs1_n) = (uint64_t) rs1; \
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asm volatile ( \
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".word " STR(CUSTOMX(X, 1, 1, 0, rd_n, rs1_n, rs2, funct)) "\n\t" \
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: "=r" (rd_) : [_rs1] "r" (rs1_)); \
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rd = rd_; \
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}
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#define ROCC_INSTRUCTION_R_I_I(X, rd, rs1, rs2, funct, rd_n) { \
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register uint64_t rd_ asm ("x" # rd_n); \
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asm volatile ( \
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".word " STR(CUSTOMX(X, 1, 0, 0, rd_n, rs1, rs2, funct)) "\n\t" \
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: "=r" (rd_)); \
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rd = rd_; \
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}
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#define ROCC_INSTRUCTION_I_R_R(X, rd, rs1, rs2, funct, rs1_n, rs2_n) { \
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register uint64_t rs1_ asm ("x" # rs1_n) = (uint64_t) rs1; \
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register uint64_t rs2_ asm ("x" # rs2_n) = (uint64_t) rs2; \
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asm volatile ( \
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".word " STR(CUSTOMX(X, 0, 1, 1, rd, rs1_n, rs2_n, funct)) "\n\t" \
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:: [_rs1] "r" (rs1_), [_rs2] "r" (rs2_)); \
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}
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#define ROCC_INSTRUCTION_I_R_I(X, rd, rs1, rs2, funct, rs1_n) { \
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register uint64_t rs1_ asm ("x" # rs1_n) = (uint64_t) rs1; \
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asm volatile ( \
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".word " STR(CUSTOMX(X, 0, 1, 0, rd, rs1_n, rs2, funct)) "\n\t" \
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:: [_rs1] "r" (rs1_)); \
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}
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#define ROCC_INSTRUCTION_I_I_I(X, rd, rs1, rs2, funct) { \
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asm volatile ( \
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".word " STR(CUSTOMX(X, 0, 0, 0, rd, rs1, rs2, funct)) "\n\t" ); \
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}
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#endif // SRC_MAIN_C_ACCUMULATOR_H
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