flywithu/debugging
1
0
Fork 0
mirror of https://github.com/ioacademy-jikim/debugging synced 2025-06-08 16:36:21 +00:00
Code Issues Releases Wiki Activity
debugging/02_day/valgrind/valgrind-3.11.0/exp-bbv/tests/x86-linux/ll.S
jikim 0b589c7986 first commit
2015-12-13 22:34:58 +09:00

626 lines
14 KiB
ArmAsm
Raw Permalink Blame History

#
# linux_logo in i386 assembly language
# based on the code from ll_asm-0.36
#
# By Vince Weaver <vince _at_ deater.net>
#
# Modified to remove non-deterministic system calls
# And to avoid reading from /proc
#
.include "logo.include"
# offsets into the results returned by the uname syscall
.equ U_SYSNAME,0
.equ U_NODENAME,65
.equ U_RELEASE,65*2
.equ U_VERSION,(65*3)
.equ U_MACHINE,(65*4)
.equ U_DOMAINNAME,65*5
# offset into the results returned by the sysinfo syscall
.equ S_TOTALRAM,16
# Sycscalls
.equ SYSCALL_EXIT, 1
.equ SYSCALL_WRITE, 4
#
.equ STDIN,0
.equ STDOUT,1
.equ STDERR,2
.globl _start
_start:
#=========================
# PRINT LOGO
#=========================
# LZSS decompression algorithm implementation
# by Stephan Walter 2002, based on LZSS.C by Haruhiko Okumura 1989
# optimized some more by Vince Weaver
# we used to fill the buffer with FREQUENT_CHAR
# but, that only gains us one byte of space in the lzss image.
# the lzss algorithm does automatic RLE... pretty clever
# so we compress with NUL as FREQUENT_CHAR and it is pre-done for us
mov $(N-F), %bp # R
mov $logo, %esi # %esi points to logo (for lodsb)
mov $out_buffer, %edi # point to out_buffer
push %edi # save this value for later
decompression_loop:
lodsb # load in a byte
mov $0xff, %bh # re-load top as a hackish 8-bit counter
mov %al, %bl # move in the flags
test_flags:
cmp $logo_end, %esi # have we reached the end?
je done_logo # if so, exit
shr $1, %ebx # shift bottom bit into carry flag
jc discrete_char # if set, we jump to discrete char
offset_length:
lodsw # get match_length and match_position
mov %eax,%edx # copy to edx
# no need to mask dx, as we do it
# by default in output_loop
shr $(P_BITS),%eax
add $(THRESHOLD+1),%al
mov %al,%cl # cl = (ax >> P_BITS) + THRESHOLD + 1
# (=match_length)
output_loop:
and $POSITION_MASK,%dh # mask it
mov text_buf(%edx), %al # load byte from text_buf[]
inc %edx # advance pointer in text_buf
store_byte:
stosb # store it
mov %al, text_buf(%ebp) # store also to text_buf[r]
inc %ebp # r++
and $(N-1), %bp # mask r
loop output_loop # repeat until k>j
or %bh,%bh # if 0 we shifted through 8 and must
jnz test_flags # re-load flags
jmp decompression_loop
discrete_char:
lodsb # load a byte
inc %ecx # we set ecx to one so byte
# will be output once
# (how do we know ecx is zero?)
jmp store_byte # and cleverly store it
# end of LZSS code
done_logo:
pop %ebp # get out_buffer and keep in bp
mov %ebp,%ecx # move out_buffer to ecx
call write_stdout # print the logo
#
# Setup
#
setup:
mov $strcat,%edx # use edx as call pointer
#==========================
# PRINT VERSION
#==========================
# push $SYSCALL_UNAME # uname syscall
# pop %eax # in 3 bytes
# mov $uname_info,%ebx # uname struct
# int $0x80 # do syscall
mov %ebp,%edi # point %edi to out_buffer
mov $(uname_info+U_SYSNAME),%esi # os-name from uname "Linux"
call *%edx # call strcat
mov $ver_string,%esi # source is " Version "
call *%edx # call strcat
push %esi # save our .txt pointer
mov $(uname_info+U_RELEASE),%esi # version from uname "2.4.1"
call *%edx # call strcat
pop %esi # restore .txt pointer
# source is ", Compiled "
call *%edx # call strcat
push %esi # store for later
mov $(uname_info+U_VERSION),%esi # compiled date
call *%edx # call strcat
mov %ebp,%ecx # move out_buffer to ecx
mov $0xa,%ax # store linefeed on end
stosw # and zero
call *%edx # call strcat
call center_and_print # center and print
#===============================
# Middle-Line
#===============================
#=========
# Load /proc/cpuinfo into buffer
#=========
push %edx # save call pointer
# push $SYSCALL_OPEN # load 5 [ open() ]
# pop %eax # in 3 bytes
# mov $cpuinfo,%ebx # '/proc/cpuinfo'
# xor %ecx,%ecx # 0 = O_RDONLY <bits/fcntl.h>
# cdq # clear edx in clever way
# int $0x80 # syscall. fd in eax.
# we should check that eax>=0
# mov %eax,%ebx # save our fd
# push $SYSCALL_READ # load 3 = read()
# pop %eax # in 3 bytes
mov $disk_buffer,%ecx
# mov $16,%dh # 4096 is maximum size of proc file #)
# we load sneakily by knowing
# 16<<8 = 4096. be sure edx clear
# int $0x80
# push $SYSCALL_CLOSE # close (to be correct)
# pop %eax
# int $0x80
#=============
# Number of CPUs
#=============
number_of_cpus:
xor %ebx,%ebx # chip count
# $disk_buffer still in ecx
bogo_loop:
mov (%ecx), %eax # load 4 bytes into eax
inc %ecx # increment pointer
cmp $0,%al # check for end of file
je done_bogo
# Grrr, due to a bug in binutils 2.18.50.0.9
# (which unfortunately shipped with Fedora 10)
# http://sourceware.org/bugzilla/show_bug.cgi?id=6878
# We can't use the apostrophe character
# cmp $('o'<<24+'g'<<16+'o'<<8+'b'),%eax
cmp $(0x6f<<24+0x67<<16+0x6f<<8+0x62),%eax
# "bogo" in little-endian
jne bogo_loop # if not equal, keep going
inc %ebx # otherwise, we have a bogo
inc %ebx # times two for future magic
jmp bogo_loop
done_bogo:
lea one-6(%ebx,%ebx,2), %esi
# Load into esi
# [one]+(num_cpus*6)
#
# the above multiplies by three
# esi = (ebx+(ebx*2))
# and we double-incremented ebx
# earlier
mov %ebp,%edi # move output buffer to edi
pop %edx # restore call pointer
call *%edx # copy it (call strcat)
# mov $' ',%al # print a space
mov $0x20,%al # print a space
stosb
push %ebx # store cpu count
push %edx # store strcat pointer
#=========
# MHz
#=========
print_mhz:
# mov $('z'<<24+'H'<<16+'M'<<8+' '),%ebx
mov $(0x7a<<24+0x48<<16+0x4d<<8+0x20),%ebx
# find ' MHz' and grab up to .
# we are little endian
# mov $'.',%ah
mov $0x2e,%ah
# below is same as "sub $(strcat-find_string),%edx
# gas won't let us force the one-byte constant
.byte 0x83,0xEA,strcat-find_string
call *%edx # call find string
mov %ebx,%eax # clever way to get MHz in, sadly
ror $8,%eax # not any smaller than a mov
stosl
#=========
# Chip Name
#=========
chip_name:
# because of ugly newer cpuinfos from intel I had to hack this
# now we grab the first two words in the name field and use that
# it works on all recent Intel and AMD chips. Older things
# might choke
# mov $('e'<<24+'m'<<16+'a'<<8+'n'),%ebx
mov $(0x65<<24+0x6d<<16+0x61<<8+0x6e),%ebx
# find 'name\t: ' and grab up to \n
# we are little endian
# mov $' ',%ah
mov $0x20,%ah
call *%edx # print first word
stosb # store a space
call skip_spaces # print next word
pop %edx
pop %ebx # restore chip count
pop %esi
call *%edx # ' Processor'
cmpb $2,%bl
jne print_s
inc %esi # if singular, skip the s
print_s:
call *%edx # 's, '
push %esi # restore the values
push %edx
#========
# RAM
#========
# push $SYSCALL_SYSINFO # sysinfo() syscall
# pop %eax
# mov $sysinfo_buff,%ebx
# int $0x80
mov (sysinfo_buff+S_TOTALRAM),%eax # size in bytes of RAM
shr $20,%eax # divide by 1024*1024 to get M
adc $0, %eax # round
call num_to_ascii
pop %edx # restore strcat pointer
pop %esi # print 'M RAM, '
call *%edx # call strcat
push %esi
#========
# Bogomips
#========
# mov $('s'<<24+'p'<<16+'i'<<8+'m'),%ebx
mov $(0x73<<24+0x70<<16+0x69<<8+0x6d),%ebx
# find 'mips\t: ' and grab up to \n
mov $0xa,%ah
call find_string
pop %esi # bogo total follows RAM
call *%edx # call strcat
push %esi
mov %ebp,%ecx # point ecx to out_buffer
call center_and_print # center and print
#=================================
# Print Host Name
#=================================
mov %ebp,%edi # point to output_buffer
mov $(uname_info+U_NODENAME),%esi # host name from uname()
call *%edx # call strcat
# ecx is unchanged
call center_and_print # center and print
pop %ecx # (.txt) pointer to default_colors
call write_stdout
#================================
# Exit
#================================
exit:
xor %ebx,%ebx
xor %eax,%eax
inc %eax # put exit syscall number (1) in eax
int $0x80 # and exit
#=================================
# FIND_STRING
#=================================
# ah is char to end at
# ebx is 4-char ascii string to look for
# edi points at output buffer
find_string:
mov $disk_buffer-1,%esi # look in cpuinfo buffer
find_loop:
inc %esi
cmpb $0, (%esi) # are we at EOF?
je done # if so, done
cmp (%esi), %ebx # do the strings match?
jne find_loop # if not, loop
# ! if we get this far, we matched
find_colon:
lodsb # repeat till we find colon
cmp $0,%al # this is actually smaller code
je done # than an or ecx/repnz scasb
# cmp $':',%al
cmp $0x3a,%al
jne find_colon
skip_spaces:
lodsb # skip spaces
cmp $0x20,%al # Loser new intel chips have lots??
je skip_spaces
store_loop:
cmp $0,%al
je done
cmp %ah,%al # is it end string?
je almost_done # if so, finish
# cmp $'\n',%al # also end if linefeed
cmp $0xa,%al # also end if linefeed
je almost_done
stosb # if not store and continue
lodsb # load value
jmp store_loop
almost_done:
movb $0, (%edi) # replace last value with NUL
done:
ret
#================================
# strcat
#================================
strcat:
lodsb # load a byte from [ds:esi]
stosb # store a byte to [es:edi]
cmp $0,%al # is it zero?
jne strcat # if not loop
dec %edi # point to one less than null
ret # return
#==============================
# center_and_print
#==============================
# string to center in ecx
center_and_print:
push %edx
push %ecx # save the string pointer
inc %edi # move to a clear buffer
push %edi # save for later
# mov $('['<<8+27),%ax # we want to output ^[[
mov $(0x5b<<8+27),%ax # we want to output ^[[
stosw
cdq # clear dx
str_loop2: # find end of string
inc %edx
cmpb $0,(%ecx,%edx) # repeat till we find zero
jne str_loop2
push $81 # one added to cheat, we don't
# count the trailing '\n'
pop %eax
cmp %eax,%edx # see if we are >=80
jl not_too_big # if so, don't center
push $80
pop %edx
not_too_big:
sub %edx,%eax # subtract size from 80
shr %eax # then divide by 2
call num_to_ascii # print number of spaces
# mov $'C',%al # tack a 'C' on the end
mov $0x43,%al # tack a 'C' on the end
# ah is zero from num_to_ascii
stosw # store C and a NULL
pop %ecx # pop the pointer to ^[[xC
call write_stdout # write to the screen
done_center:
pop %ecx # restore string pointer
# and trickily print the real string
pop %edx
#================================
# WRITE_STDOUT
#================================
# ecx has string
# eax,ebx,ecx,edx trashed
write_stdout:
push %edx
push $SYSCALL_WRITE # put 4 in eax (write syscall)
pop %eax # in 3 bytes of code
cdq # clear edx
xor %ebx,%ebx # put 1 in ebx (stdout)
inc %ebx # in 3 bytes of code
# another way of doing this: lea 1(%edx), %ebx
str_loop1:
inc %edx
cmpb $0,(%ecx,%edx) # repeat till zero
jne str_loop1
int $0x80 # run the syscall
pop %edx
ret
##############################
# num_to_ascii
##############################
# ax = value to print
# edi points to where we want it
num_to_ascii:
push $10
pop %ebx
xor %ecx,%ecx # clear ecx
div_by_10:
cdq # clear edx
div %ebx # divide
push %edx # save for later
inc %ecx # add to length counter
or %eax,%eax # was Q zero?
jnz div_by_10 # if not divide again
write_out:
pop %eax # restore in reverse order
add $0x30, %al # convert to ASCII
stosb # save digit
loop write_out # loop till done
ret
#===========================================================================
# section .data
#===========================================================================
.data
ver_string: .ascii " Version \0"
compiled_string: .ascii ", Compiled \0"
processor: .ascii " Processor\0"
s_comma: .ascii "s, \0"
ram_comma: .ascii "M RAM, \0"
bogo_total: .ascii " Bogomips Total\n\0"
default_colors: .ascii "\033[0m\n\n\0"
cpuinfo: .ascii "/proc/cpuinfo\0"
one: .ascii "One\0\0\0"
two: .ascii "Two\0\0\0"
three: .ascii "Three\0"
four: .ascii "Four\0"
.include "logo.lzss_new"
disk_buffer:
.ascii "processor : 0\n"
.ascii "vendor_id : AuthenticAMD\n"
.ascii "cpu family : 6\n"
.ascii "model : 6\n"
.ascii "model name : AMD Athlon(tm) XP 2000+\n"
.ascii "stepping : 2\n"
.ascii "cpu MHz : 1665.267\n"
.ascii "cache size : 256 KB\n"
.ascii "fdiv_bug : no\n"
.ascii "hlt_bug : no\n"
.ascii "f00f_bug : no\n"
.ascii "coma_bug : no\n"
.ascii "fpu : yes\n"
.ascii "fpu_exception : yes\n"
.ascii "cpuid level : 1\n"
.ascii "wp : yes\n"
.ascii "flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow up\n"
.ascii "bogomips : 3330.53\n"
.ascii "clflush size : 32\n"
.ascii "power management: ts\n\0"
uname_info:
.ascii "Linux\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
.ascii "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
.ascii "tobler\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
.ascii "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
.ascii "2.6.29\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
.ascii "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
.ascii "#1 SMP Mon May 4 09:51:54 EDT 2009\0\0"
.ascii "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
.ascii "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
.ascii "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
.ascii "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
.ascii "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
sysinfo_buff:
.long 0,0,0,0,512*1024*1024,0,0,0,0
.long 0,0,0,0,0,0,0,0,0
#============================================================================
# section .bss
#============================================================================
.bss
.lcomm text_buf, (N+F-1)
.lcomm out_buffer,16384
Reference in New Issue View Git Blame Copy Permalink