From 3350c34a74844e21ea69077e01efff3bae64bdcd Mon Sep 17 00:00:00 2001 From: Kartik Agaram Date: Tue, 23 Mar 2021 17:31:08 -0700 Subject: . --- html/linux/000init.subx.html | 148 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 148 insertions(+) create mode 100644 html/linux/000init.subx.html (limited to 'html/linux/000init.subx.html') diff --git a/html/linux/000init.subx.html b/html/linux/000init.subx.html new file mode 100644 index 00000000..d37a8329 --- /dev/null +++ b/html/linux/000init.subx.html @@ -0,0 +1,148 @@ + + + + +Mu - linux/000init.subx + + + + + + + + + + +https://github.com/akkartik/mu/blob/main/linux/000init.subx +
+ 1 # Some OS-specific preliminaries for Linux.
+ 2 
+ 3 # Memory layout
+ 4 #
+ 5 #          0 - 0x08047ffff - reserved for the kernel
+ 6 # 0x08048000 - 0xbffffffff - available for user programs
+ 7 # 0xc0000000 - 0xfffffffff - reserved for the kernel
+ 8 == code 0x09000000
+ 9 == data 0x0a000000
+10 
+11 # Syscalls
+12 #
+13 # We don't have libc, so we need to know Linux's precise syscall layout.
+14 # These are not real functions. Pass arguments in specific registers.
+15 == code
+16 
+17 # http://man7.org/linux/man-pages/man2/exit.2.html
+18 syscall_exit:  # status/ebx: int
+19     b8/copy-to-eax 1/imm32
+20     cd/syscall 0x80/imm8
+21 
+22 # http://man7.org/linux/man-pages/man2/read.2.html
+23 syscall_read:  # fd/ebx: int, buf/ecx: addr, size/edx: int -> nbytes-or-error/eax: int
+24     b8/copy-to-eax 3/imm32
+25     cd/syscall 0x80/imm8
+26     c3/return
+27 
+28 # http://man7.org/linux/man-pages/man2/write.2.html
+29 syscall_write:  # fd/ebx: int, buf/ecx: addr, size/edx: int -> nbytes-or-error/eax: int
+30     b8/copy-to-eax 4/imm32
+31     cd/syscall 0x80/imm8
+32     c3/return
+33 
+34 # http://man7.org/linux/man-pages/man2/open.2.html
+35 syscall_open:  # filename/ebx: (addr kernel-string), flags/ecx: int, dummy=0x180/edx -> fd-or-error/eax: int
+36     b8/copy-to-eax 5/imm32
+37     cd/syscall 0x80/imm8
+38     c3/return
+39 
+40 # http://man7.org/linux/man-pages/man2/close.2.html
+41 syscall_close:  # fd/ebx: int -> status/eax
+42     b8/copy-to-eax 6/imm32
+43     cd/syscall 0x80/imm8
+44     c3/return
+45 
+46 # http://man7.org/linux/man-pages/man2/lseek.2.html
+47 syscall_lseek:  # fd/ebx: int, offset/ecx: int, whence/edx: int
+48     b8/copy-to-eax 0x13/imm32
+49     cd/syscall 0x80/imm8
+50     c3/return
+51 
+52 # http://man7.org/linux/man-pages/man2/creat.2.html
+53 syscall_creat:  # filename/ebx: (addr kernel-string) -> fd-or-error/eax: int
+54     b8/copy-to-eax 8/imm32
+55     cd/syscall 0x80/imm8
+56     c3/return
+57 
+58 # http://man7.org/linux/man-pages/man2/unlink.2.html
+59 syscall_unlink:  # filename/ebx: (addr kernel-string) -> status/eax: int
+60     b8/copy-to-eax 0xa/imm32
+61     cd/syscall 0x80/imm8
+62     c3/return
+63 
+64 # http://man7.org/linux/man-pages/man2/rename.2.html
+65 syscall_rename:  # source/ebx: (addr kernel-string), dest/ecx: (addr kernel-string) -> status/eax: int
+66     b8/copy-to-eax 0x26/imm32
+67     cd/syscall 0x80/imm8
+68     c3/return
+69 
+70 # https://github.com/torvalds/linux/blob/fa121bb3fed6313b1f0af23952301e06cf6d32ed/mm/nommu.c#L1352
+71 syscall_mmap:  # arg/ebx: (addr mmap_arg_struct) -> status/eax: int
+72     # the important thing: ebx+4 contains the 32-bit size to be allocated
+73     b8/copy-to-eax 0x5a/imm32
+74     cd/syscall 0x80/imm8
+75     c3/return
+76 
+77 syscall_ioctl:  # fd/ebx: int, cmd/ecx: int, arg/edx: (addr _)
+78     b8/copy-to-eax 0x36/imm32
+79     cd/syscall 0x80/imm8
+80     c3/return
+81 
+82 syscall_nanosleep:  # req/ebx: (addr timespec)
+83     b8/copy-to-eax 0xa2/imm32  # 162
+84     cd/syscall 0x80/imm8
+85     c3/return
+86 
+87 syscall_clock_gettime:  # clock/ebx: int, out/ecx: (addr timespec)
+88     b8/copy-to-eax 0x109/imm32  # 265
+89     cd/syscall 0x80/imm8
+90     c3/return
+
+ + + -- cgit 1.4.1-2-gfad0