49 lines
1,022 B
ArmAsm
49 lines
1,022 B
ArmAsm
# For a quick reference on RISC-V assembly:
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# https://risc-v.guru/instructions/
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# Context switch
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#
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# Save current registers in old. Load from new.
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#
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# See: defs.h for swtch declaration
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# See: proc.h for struct context definition
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#
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# void swtch(struct context *old, struct context *new);
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.globl swtch
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swtch:
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# sd = Store Double (64 bits)
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sd ra, 0(a0)
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sd sp, 8(a0)
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sd s0, 16(a0)
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sd s1, 24(a0)
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sd s2, 32(a0)
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sd s3, 40(a0)
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sd s4, 48(a0)
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sd s5, 56(a0)
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sd s6, 64(a0)
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sd s7, 72(a0)
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sd s8, 80(a0)
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sd s9, 88(a0)
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sd s10, 96(a0)
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sd s11, 104(a0)
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# ld = Load Double (64 bits)
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ld ra, 0(a1)
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ld sp, 8(a1)
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ld s0, 16(a1)
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ld s1, 24(a1)
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ld s2, 32(a1)
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ld s3, 40(a1)
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ld s4, 48(a1)
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ld s5, 56(a1)
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ld s6, 64(a1)
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ld s7, 72(a1)
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ld s8, 80(a1)
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ld s9, 88(a1)
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ld s10, 96(a1)
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ld s11, 104(a1)
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ret
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