161 lines
3 KiB
ArmAsm
161 lines
3 KiB
ArmAsm
; Returns:
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; rax - 0
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; Errors (in rax):
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; rax - 0 - EOF
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; rax - -1024 - line too long
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; rax - other negative - from read(2)
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; Arguments:
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; rdi - fd
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; rsi - address of client within clients array
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; rdx - pollfds index
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; Variables:
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; rbx - pollfds index
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; r12 - client buffer
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; r13 - start of line scanning
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; r14 - client buffer end
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client__pollin:
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push rbx
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push r12
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push r13
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push r14
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mov rbx, rdx
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mov r12, rsi
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add r12, OFFSET_CLIENT_BUFFER
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mov r13, 0
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mov r13b, [rsi + OFFSET_CLIENT_BUFFER_LEN]
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add r13, r12
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mov r14, r12
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add r14, 255
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mov rax, SYS_READ
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mov rsi, r13
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mov rdx, 255
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sub dl, [rsi + OFFSET_CLIENT_BUFFER_LEN]
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syscall
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cmp rax, 0
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jle client__pollin__return ; TODO verify this shit
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; buffer_len += read(2) length
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add [r12 - OFFSET_CLIENT_BUFFER + OFFSET_CLIENT_BUFFER_LEN], al
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mov rdi, r13
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mov rsi, rax
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call scanline
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cmp rax, 0
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je client__pollin__no_line
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mov rax, 1
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mov word [pollfds + rbx * pollfd_size + 4], POLLOUT
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client__pollin__return:
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pop r14
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pop r13
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pop r12
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pop rbx
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ret
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client__pollin__no_line:
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mov r10, r13
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add r10, rax
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cmp r10, r14
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jge client__pollin__line_too_long
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mov rax, 1
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jmp client__pollin__return
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client__pollin__line_too_long:
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mov rax, -1024
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jmp client__pollin__return
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; Returns:
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; rax - non-negative from write(2)
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; Errors:
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; rax - -1024 - no line was buffered
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; rax - other negative - from write(2)
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; Arguments:
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; rdi - fd
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; rsi - address of client within clients array
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; rdx - pollfds index
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; Variables:
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; rbx - pollfds index
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; r12 - address of client within clients array
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; r13 - line length
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; r11 - client buffer end of text after call to write(2)
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client__pollout:
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push rbx
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push r12
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push r13
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mov rbx, rdx
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mov r12, rsi
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push rdi
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mov rdi, r12
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add rdi, OFFSET_CLIENT_BUFFER
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mov rsi, 255
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call scanline
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pop rdi
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; poll(2)'d for POLLOUT but we had no line buffered;
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; should be impossible
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cmp rax, 0
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je client__pollout__no_line
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mov r13, rax
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mov rax, SYS_WRITE
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mov rsi, r12
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add rsi, OFFSET_CLIENT_BUFFER
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mov rdx, r13
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syscall
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; error from write(2)
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cmp rax, 0
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jl client__pollout__return
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mov r10, r12
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mov r11, 0
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mov r11b, [r12 + OFFSET_CLIENT_BUFFER_LEN]
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add r11, r12
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sub r11, rax
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client__pollout__shunt:
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cmp r10, r11
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jge client__pollout__shunt__finished
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mov r8b, [r10 + rax]
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mov [r10], r8b
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add r10, 1
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jmp client__pollout__shunt
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client__pollout__shunt__finished:
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; buffer_len -= rax
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sub [r12 + OFFSET_CLIENT_BUFFER_LEN], al
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cmp rax, r13
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jl client__pollout__return
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mov word [pollfds + rbx * pollfd_size + 4], POLLIN
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client__pollout__return:
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pop r13
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pop r12
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pop rbx
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ret
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client__pollout__no_line:
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mov rax, -1024
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jmp client__pollout__return
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; rdi - fd
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client__shutdown_close:
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mov rax, SYS_SHUTDOWN
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push rdi
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mov rsi, SHUT_RDWR
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syscall
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mov rax, SYS_CLOSE
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pop rdi
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syscall
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ret
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