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- ffffuuuubbbbyyyytttteeee((((DDDD3333XXXX)))) ffffuuuubbbbyyyytttteeee((((DDDD3333XXXX))))
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- NNNNAAAAMMMMEEEE
- _ffff_uuuu_bbbb_yyyy_tttt_eeee - fetch (read) a byte from user space
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- _iiii_nnnn_tttt _ffff_uuuu_bbbb_yyyy_tttt_eeee_((((_cccc_hhhh_aaaa_rrrr _****_u_s_r__v__a_d_d_r_))))_;;;;
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- _ffff_uuuu_bbbb_yyyy_tttt_eeee reads a single (8-bit) byte from the specified address,
- _u_s_r__v__a_d_d_r, in the currently mapped user process address space.
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- RRRReeeettttuuuurrrrnnnn VVVVaaaalllluuuueeeessss
- Upon successful completion, _ffff_uuuu_bbbb_yyyy_tttt_eeee returns the value of the byte at
- _u_s_r__v__a_d_d_r, a value from 0 to 255.
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- Otherwise, _ffff_uuuu_bbbb_yyyy_tttt_eeee returns -1, indicating an invalid user virtual address.
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- SSSSeeeeeeee AAAAllllssssoooo
- _ffff_uuuu_wwww_oooo_rrrr_dddd(D3X), _ssss_uuuu_bbbb_yyyy_tttt_eeee(D3X), _cccc_oooo_pppp_yyyy_iiii_nnnn(D3)
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- PPPPaaaaggggeeee 1111
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