calculated offsets
This commit is contained in:
parent
0c81162553
commit
f6ffba2460
SSH key fingerprint:
SHA256:bB1qbbqmDXZNT0KKD5c2Dfjg53JGhj7B3CFcLIzSqq8
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@ -81,6 +81,16 @@ find_lbl:
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mov eax, dword [rdx + 8] ; get file offset of label
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mov eax, dword [rdx + 8] ; get file offset of label
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ret
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ret
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;; write up to write_cursor to stdout, and then reset the write cursor to 0
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wrt_stdout:
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mov rax, 1 ; syscall: write
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mov rdi, 1 ; fd: stdout
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lea rsi, [r15 + 0x1000] ; buf: pointer to write_buf
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mov edx, dword [r15 + 0x5004] ; count: write_cursor
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syscall
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mov dword [r15 + 0x5004], 0
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ret
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die_jmp_start:
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die_jmp_start:
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;; @_start_lbl: 5F 73 74 61 72 74 00 00
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;; @_start_lbl: 5F 73 74 61 72 74 00 00
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;; lea rdi, [@_start_lbl]
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;; lea rdi, [@_start_lbl]
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@ -94,6 +104,7 @@ die_jmp_start:
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mov byte [rdi], 0xe9 ; write the opcode for jmp rel32
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mov byte [rdi], 0xe9 ; write the opcode for jmp rel32
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mov dword [rdi + 1], eax ; write the offset of the label reference
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mov dword [rdi + 1], eax ; write the offset of the label reference
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add dword [r15 + 0x5004], 5 ; advance the write cursor by 5
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add dword [r15 + 0x5004], 5 ; advance the write cursor by 5
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call wrt_stdout
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call die
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call die
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;; reads up to 0x1000 bytes from stdin into buf, and sets read_end to the number of bytes read, and resets read_cursor to 0
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;; reads up to 0x1000 bytes from stdin into buf, and sets read_end to the number of bytes read, and resets read_cursor to 0
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@ -110,16 +121,6 @@ rd_stdin:
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mov dword [r15 + 0x5000], 0 ; reset read_cursor to 0
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mov dword [r15 + 0x5000], 0 ; reset read_cursor to 0
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ret
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ret
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;; write up to write_cursor to stdout, and then reset the write cursor to 0
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wrt_stdout:
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mov rax, 1 ; syscall: write
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mov rdi, 1 ; fd: stdout
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lea rsi, [r15 + 0x1000] ; buf: pointer to write_buf
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mov edx, dword [r15 + 0x5004] ; count: write_cursor
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syscall
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mov dword [r15 + 0x5004], 0
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ret
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;; return the next byte from the input
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;; return the next byte from the input
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;; automatically writes to stdout and reads from stdin if we are at the end of the buffer
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;; automatically writes to stdout and reads from stdin if we are at the end of the buffer
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rd_buf:
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rd_buf:
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@ -1,4 +1,263 @@
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# panic: +0
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; @panic: +0
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# mov rax, 60 ; syscall: exit
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b8 3c 00 00 00 ; mov rax, 60 (exit)
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# mov rdi, 1 ; status: 1
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bf 01 00 00 00 ; mov rdi, 1 (exit code)
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# syscall
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0f 05 ; syscall
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; @die: +12
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b8 3c 00 00 00 ; mov rax, 60 (exit)
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bf 00 00 00 00 ; mov rdi, 0 (exit
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0f 05 ; syscall
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; @fasthash_exit: +24
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c3 ; ret
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; @fasthash: +25
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b8 c5 9d 1c 81 ; mov rax, 0x811c9dc5 (FNV offset basis)
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; @fasthash_loop: +30
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48 85 f6 ; test rsi, rsi
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0f 84 cc cc cc cc ; jz 'fasthash_exit (+39)
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0f b6 0f ; movzx ecx, byte [rdi]
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31 c8 ; xor eax, ecx
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69 c0 93 01 00 01 ; imul eax, eax, 0x1000193 (FNV prime)
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48 ff c7 ; inc rdi
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48 ff ce ; dec rsi
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e9 cc cc cc cc ; jmp 'fasthash_loop (+61)
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; @push_lbl: +61
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41 8b 87 00 60 00 00 ; mov eax, [r15+0x6000]
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3d 54 01 00 00 ; cmp eax, 0x154
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0f 8d cc cc cc cc ; jge 'panic (+79)
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8d 14 40 ; lea edx, [rax + rax*2]
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48 c1 e2 02 ; shl rdx, 2
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52 ; push rdx
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e8 cc cc cc cc ; call 'fasthash (+92)
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5a ; pop rdx
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49 8d bf 10 50 00 00 ; lea rdi, [r15+0x5010]
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48 89 04 17 ; mov qword [rdi+rdx], rax
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41 8b 87 0c 50 00 00 ; mov eax, dword [r15+0x500c]
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89 44 17 08 ; mov dword [rdi+rdx+8], eax
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41 ff 87 00 60 00 00 ; inc dword [r15+0x6000]
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c3 ; ret
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; @find_lbl_not_found: (+123)
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e8 cc cc cc cc ; call 'panic (+128)
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; @find_lbl_found:
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8b 42 08 ; mov eax, dword [rdx+8]
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c3 ; ret
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; @find_lbl: +132
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e8 cc cc cc cc ; call 'fasthash (+137)
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49 8d 97 10 50 00 00 ; lea rdx, [r15+0x5010]
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41 8b 9f 00 60 00 00 ; mov edx, dword [r15+0x6000]
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; @find_lbl_loop: (+151)
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48 85 db ; test rbx, rbx
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0f 84 cc cc cc cc ; jz 'find_lbl_not_found (+160)
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48 ff cb ; dec rbx
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48 39 02 ; cmp [rdx], rax
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0f 84 cc cc cc cc ; jz 'find_lbl_found (+172)
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48 83 c2 0c ; add rdx, 0xc
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e9 cc cc cc cc ; jmp 'find_lbl_loop (+181)
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; @wrt_stdout: (+181)
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b8 01 00 00 00 ; mov rax, 1 (sys_write)
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bf 01 00 00 00 ; mov rdi, 1 (stdout)
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49 8d b7 00 10 00 00 ; lea rsi, [r15+0x1000]
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41 8b 97 04 50 00 00 ; mov edx, dword [r15+0x5004]
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0f 05 ; syscall
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41 c7 87 04 50 00 00 00 00 00 00 ; mov dword [r15+0x5004], 0
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c3 ; ret
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; @_start_lbl: (+219)
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5f 73 74 61 72 74 00
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; @die_jmp_start: (+226)
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48 8d 3d cc cc cc cc ; lea rdi, [rip+@_start_lbl] (+233)
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be 06 00 00 00 ; mov esi, 6
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e8 cc cc cc cc ; call 'find_lbl (+243)
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41 83 87 0c 50 00 00 05 ; add dword [r15+0x500c], 5
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41 2b 87 0c 50 00 00 ; sub eax, dword [r15+0x500c]
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41 8b bf 04 50 00 00 ; mov edi, dword [r15+0x5004]
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49 8d bc 3f 00 10 00 00 ; lea rdi, [r15+rdi*1+0x1000]
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c6 07 e9 ; mov byte [rdi], 0xe9
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89 47 01 ; mov dword [rdi+1], eax
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41 83 87 04 50 00 00 05 ; add dword [r15+0x5004], 5
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e8 cc cc cc cc ; call 'wrt_stdout (+292)
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e8 cc cc cc cc ; call 'die (+297)
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; @rd_stdin: (+297)
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b8 00 00 00 00 ; mov rax, 0 (sys_read)
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bf 00 00 00 00 ; mov rdi, 0 (stdin)
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4c 89 fe ; mov rsi, r15
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ba 00 10 00 00 ; mov rdx, 0x1000
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0f 05 ; syscall
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85 c0 ; test rax, rax
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0f 8e cc cc cc cc ; jle 'die_jmp_start (+325)
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41 89 87 08 50 00 00 ; mov dword [r15+0x5008], eax
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41 c7 87 00 50 00 00 00 00 00 00 ; mov dword [r15+0x5000], 0
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c3 ; ret
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; @rd_buf_end: (+344)
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41 8b 97 00 50 00 00 ; mov edx, dword [r15+0x5000]
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48 31 c0 ; xor rax, rax
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41 8a 04 17 ; mov al, byte [rdi+rdx]
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41 ff 87 00 50 00 00 ; inc dword [r15+0x5000]
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c3 ; ret
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; @rd_buf: (+366)
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41 8b 87 00 50 00 00 ; mov eax, dword [r15+0x5000]
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41 3b 87 08 50 00 00 ; cmp eax, dword [r15+0x5008]
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0f 8c cc cc cc cc ; jl 'rd_buf_end (+386)
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e8 cc cc cc cc ; call 'wrt_stdout (+391)
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e8 cc cc cc cc ; call 'rd_stdin (+396)
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e9 cc cc cc cc ; jmp 'rd_buf_end (+401)
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; @skip_line_read: (+401)
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e8 cc cc cc cc ; call 'rd_buf (+406)
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; @skip_line: (+406)
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3c 0a ; cmp al, 0xa (newline)
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0f 85 cc cc cc cc ; jnz 'skip_line_read (+414)
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e8 cc cc cc cc ; call 'rd_buf (+419)
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c3 ; ret
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; @skip_whitespace_read: (+420)
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e8 cc cc cc cc ; call 'rd_buf (+425)
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; @skip_whitespace: (+425)
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3c 20 ; cmp al, 0x20 (space)
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0f 84 cc cc cc cc ; jz 'skip_whitespace_read (+433)
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3c 0a ; cmp al, 0xa (newline)
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0f 84 cc cc cc cc ; jz 'skip_whitespace_read (+441)
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3c 09 ; cmp al, 0x9 (tab)
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0f 84 cc cc cc cc ; jz 'skip_whitespace_read (+449)
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c3 ; ret
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; @skip_comment_ret: (+450)
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c3 ; ret
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; @skip_comment: (+451)
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3c 3b ; cmp al, 0x3b (semicolon)
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0f 85 cc cc cc cc ; jnz 'skip_comment_ret (+459)
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e8 cc cc cc cc ; call 'skip_line +(464)
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c3 ; ret
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; @get_next_token_skip: (+465)
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e8 cc cc cc cc ; call 'skip_whitespace (+470)
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e8 cc cc cc cc ; call 'skip_comment (+475)
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; @get_next_token: (+475)
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3c 3b ; cmp al, 0x3b (semicolon)
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0f 84 cc cc cc cc ; jz 'get_next_token_skip (+483)
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3c 0a ; cmp al, 0xa (newline)
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0f 84 cc cc cc cc ; jz 'get_next_token_skip (+491)
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3c 20 ; cmp al, 0x20 (space)
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0f 84 cc cc cc cc ; jz 'get_next_token_skip (+499)
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3c 09 ; cmp al, 0x9 (tab)
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0f 84 cc cc cc cc ; jz 'get_next_token_skip (+507)
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c3 ; ret
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; @invalid_hex: (+508)
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e8 cc cc cc cc ; call 'panic (+513)
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; @is_digit: (+513)
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2c 30 ; sub al, 0x30 (digit '0')
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c3 ; ret
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; @is_low_alpha: (+516)
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2c 57 ; sub al, 0x57 (letter 'a' - 10)
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c3 ; ret
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; @is_up_alpha: (+519)
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2c 37 ; sub al, 0x37 (letter 'A' - 10)
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c3 ; ret
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; @char_to_u4: (+522)
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3c 30 ; cmp al, 0x30 (digit '0')
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0f 82 cc cc cc cc ; jb 'invalid_hex (+530)
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3c 39 ; cmp al, 0x39 (digit '9')
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0f 86 cc cc cc cc ; jbe 'is_digit (+538)
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3c 41 ; cmp al, 0x41 (letter 'A')
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0f 82 cc cc cc cc ; jb 'invalid_hex (+546)
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3c 46 ; cmp al, 0x46 (letter 'F')
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0f 86 cc cc cc cc ; jbe 'is_up_alpha (+554)
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3c 61 ; cmp al, 0x61 (letter 'a')
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0f 82 cc cc cc cc ; jb 'invalid_hex (+562)
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3c 66 ; cmp al, 0x66 (letter 'f')
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0f 86 cc cc cc cc ; jbe 'is_low_alpha (+570)
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e9 cc cc cc cc ; jmp 'invalid_hex (+575)
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; @octet: (+575)
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48 83 ec 08 ; sub rsp, 8
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e8 cc cc cc cc ; call 'char_to_u4 (+584)
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88 04 24 ; mov byte [rsp], al
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e8 cc cc cc cc ; call 'rd_buf (+592)
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e8 cc cc cc cc ; call 'char_to_u4 (+597)
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8a 1c 24 ; mov bl, byte [rsp]
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c0 e3 04 ; shl bl, 4
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08 d8 ; or al, bl
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41 8b bf 04 50 00 00 ; mov edi, dword [r15+0x5004]
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49 8d 97 00 10 00 00 ; lea rdx, [r15+0x1000]
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88 04 17 ; mov byte [rdi+rdx], al
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41 ff 87 04 50 00 00 ; inc dword [r15+0x5004]
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41 ff 87 0c 50 00 00 ; inc dword [r15+0x500c]
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48 83 c4 08 ; add rsp, 8
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c3 ; ret
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; @label_ref_ret: (+641)
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49 8d bf 04 60 00 00 ; lea rdi, [r15+0x6004]
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e8 cc cc cc cc ; call 'find_lbl (+653)
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41 83 87 0c 50 00 00 04 ; add dword [r15+0x500c], 4
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41 2b 87 0c 50 00 00 ; sub eax, dword [r15+0x500c]
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41 8b bf 04 50 00 00 ; mov edi, dword [r15+0x5004]
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41 89 84 3f 00 10 00 00 ; mov dword [r15+rdi*1+0x1000], eax
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41 83 87 04 50 00 00 04 ; add dword [r15+0x5004], 4
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c3 ; ret
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; @not_label_ref: (+692)
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e8 cc cc cc cc ; call 'octet (+697)
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c3 ; ret
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; @label_ref: (+698)
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3c 27 ; cmp al, 0x27 (single quote)
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0f 85 cc cc cc cc ; jnz 'not_label_ref (+706)
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48 31 f6 ; xor rsi, rsi
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; @label_ref_loop: (+709)
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56 ; push rsi
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e8 cc cc cc cc ; call 'rd_buf (+715)
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5e ; pop rsi
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49 8d bf 04 60 00 00 ; lea rdi, [r15+0x6004]
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3c 20 ; cmp al, 0x20 (space)
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0f 84 cc cc cc cc ; jz 'label_ref_loop (+731)
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3c 09 ; cmp al, 0x9 (tab)
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0f 84 cc cc cc cc ; jz 'label_ref_loop (+739)
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3c 0a ; cmp al, 0xa (newline)
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0f 84 cc cc cc cc ; jz 'label_ref_loop (+747)
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88 04 37 ; mov byte [rdi+rsi*1], al
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48 ff c6 ; inc rsi
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e9 cc cc cc cc ; jmp 'label_ref_loop (+758)
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; @label_ret: (+758)
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49 8d bf 04 60 00 00 ; lea rdi, [r15+0x6004]
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e8 cc cc cc cc ; call 'push_lbl (+770)
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c3 ; ret
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; @not_label: (+771)
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e8 cc cc cc cc ; call 'label_ref (+776)
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c3 ; ret
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; @label: (+777)
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3c 40 ; cmp al, 0x40 (at sign)
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0f 85 cc cc cc cc ; jnz 'not_label (+785)
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48 31 f6 ; xor rsi, rsi
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; @label_loop: (+788)
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56 ; push rsi
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e8 cc cc cc cc ; call 'rd_buf (+794)
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5e ; pop rsi
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49 8d bf 04 60 00 00 ; lea rdi, [r15+0x6004]
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3c 3a ; cmp al, 0x3a (colon)
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0f 84 cc cc cc cc ; jz 'label_ret (+810)
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88 04 37 ; mov byte [rdi+rsi*1], al
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48 ff c6 ; inc rsi
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e9 cc cc cc cc ; jmp 'label_loop (+821)
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; @_start: (+821)
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55 ; push rbp
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48 89 e5 ; mov rbp, rsp
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48 81 ec 00 80 00 00 ; sub rsp, 0x8000
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49 89 e7 ; mov r15, rsp
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41 c7 87 00 60 00 00 00 00 00 00 ; mov dword [r15+0x6000], 0
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41 c7 87 0c 50 00 00 00 00 00 00 ; mov dword [r15+0x500c], 0
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41 c7 87 08 50 00 00 00 00 00 00 ; mov dword [r15+0x5008], 0
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41 c7 87 04 50 00 00 00 00 00 00 ; mov dword [r15+0x5004], 0
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41 c7 87 00 50 00 00 00 00 00 00 ; mov dword [r15+0x5000], 0
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; @main_loop:
|
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e8 cc cc cc cc ; call 'rd_buf (+895)
|
||||||
|
e8 cc cc cc cc ; call 'get_next_token (+900)
|
||||||
|
e8 cc cc cc cc ; call 'label (+905)
|
||||||
|
e9 cc cc cc cc ; jmp 'main_loop (+910)
|
||||||
|
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue