53 lines
2.3 KiB
Plaintext
53 lines
2.3 KiB
Plaintext
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EABI Name Description Saver
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x0 zero Hard-wired zero value -
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x1 ra Return address Caller
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x2 sp Stack pointer Callee
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x3 gp Global pointer -
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x4 tp Thread pointer -
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x5 t0 Temporary/link register Caller
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x6 s3 Saved register Callee
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x7 s4 Saved register Callee
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x8 s0/fp Saved register/frame pointer Callee
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x9 s1 Saved register Callee
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x10 a0 Argument/return value Caller
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x11 a1 Argument/return value Caller
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x12 a2 Argument Caller
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x13 a3 Argument Caller
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x14 s2 Saved register Callee
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x15 t1 Temporary Caller
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x16-x31 s5-s20 Saved registers Callee
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reg ABI Use by convention Preserved?
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x0 zero hardwired to 0, ignores writes n/a
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x1 ra return address for jumps no
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x2 sp stack pointer yes
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x3 gp global pointer n/a
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x4 tp thread pointer n/a
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x5 t0 temporary register 0 no
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x6 t1 temporary register 1 no
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x7 t2 temporary register 2 no
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x8 s0/fp saved register 0 or frame pointer yes
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x9 s1 saved register 1 yes
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x10 a0 argument/return value 0 no
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x11 a1 argument/return value 1 no
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x12 a2 argument 2 no
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x13 a3 argument 3 no
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x14 a4 argument 4 no
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x15 a5 argument 5 no
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x16 a6 argument 6 no
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x17 a7 argument 7 no
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x18 s2 saved register 2 yes
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x19 s3 saved register 3 yes
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x20 s4 saved register 4 yes
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x21 s5 saved register 5 yes
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x22 s6 saved register 6 yes
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x23 s7 saved register 7 yes
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x24 s8 saved register 8 yes
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x25 s9 saved register 9 yes
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x26 s10 saved register 10 yes
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x27 s11 saved register 11 yes
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x28 t3 temporary register 3 no
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x29 t4 temporary register 4 no
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x30 t5 temporary register 5 no
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x31 t6 temporary register 6 no
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