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ll.sh3.s
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ll.sh3.s
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!
! linux_logo in SH3 assembler 0.30
!
! By
! Vince Weaver <vince _at_ deater.net>
!
! assemble with "as -o ll.o ll.sh3.s"
! link with "ld -o ll ll.o"
! I have to cross-compile, so what I do is was more like
! make CROSS=sh3-linux- ARCH=sh3
! RISC
! 32-bit, 16-bit instructions. 16 gp registers, banked
! delayed branches. Also has DSP built-in.
! SH-3E has floating point built in.
! Bottom 8 registers are banked based on processor mode,
! but bank0 is always used in user space
! R0 has special meaning in some addressing modes
! GBR register = for I/O accesses?
! MACH/MACL multiply registers
! PR (Procedure Register)
! PC - Program counter
! can be either big or little endian
! T bit in condition codes set on compare instruction
! S bit used in 64-bit multiply
! addressing modes
! direct register rn
! indirect register @rn
! post-increment indirect @rn+
! pre-decrement indirect -@rn
! indirect w dispalcement @(disp:4,rn) [4 bit displacemnt]
! indirect indexed @(r0,rn) [has to be r0]
! ind GBR displacement @(disp:8,GBR) [8 bit displacement]
! ind indexed GBR @(R0,GBR) [has to be r0]
! ind PC w displacement @(disp:8,PC)
! PC relative disp [either 8 or 12 bits, or R0]
! immediate #val [tst,and,or,xor=zero extended,
! mov,add,comp=sign extended,
! quadupled for trapa]
! Instructions
! ADD Rm,Rn = Rm+Rn->Rn
! ADDC = add carry (T is carry reg) ADDV = add with overflow
! AND (full or 8-bit zero extend) AND.B (8-bit and w mem at GBR)
! BF (branch if false, no delay slot) BF/S (branch if false)
! BRA (branch always) BRAF (branch far [pc+reg])
! BSR (branch to subroutine, PC->PR)
! BSRF (branch to subroutine far [pc+reg])
! BT (branch if true, no delay slot) BT/S (branch if true)
! CLRMAC (clear multiply/accum reg) CLRS (clear S bit)
! CLRT (clear T bit)
! CMP/EQ CMP/GE CMP/GT CMP/HI CMP/HS CMP/PL CMP/PZ CMP/STR
! equal, greater than or equal, greater than
! higher than (ie unsigned gt), higher or same,
! positive, positive or zero, byte in rn=byte in rm
! only immediate compate is with CMP/EQ
! sets T flag
! DIV0S (divide step 0 signed) DIV0U (div step 0 unsigned)
! DIV1 (divide step 1)
! DMULS.L (do 32x32 multiply and store in MACL and MACH)
! DMULU.L (do unsigned 32x32 mult and store in MACL/MACH)
! DT (decrement and test. subtrace one, compare 0, set T)
! EXTS (extend as signed) EXTU (extend as unsigned)
! JMP (jump) JSR (jump subroutine)
! LDS, LDS.L (load to system reg). On plain sh3 only MACH and MACL targets
! MAC.L (multiply and accumulate. two 32-bit vals read from mem and
! multipled, then added to current MAC registers)
! MAC,MAC.W (two 16-bit vals read from mem and multiplied and added to MAC)
! MOV, MOV.B, MOV.W, MOV.L (move)
! MOVA (move effective address) PC+disp -> R0
! MOVT (T bit stored in REG, zero extended)
! MUL.L (two 32-bit values multiplied, bottom 32bits only stored in MAC)
! MULS.W (two 16-bit signed values multiplied, stored in MAC)
! MULU.W (16-bit unsigned mul)
! NEG (negate), NEGC (negate w carry, used for negating > 32bit num)
! NOP (nop) NOT (1's complement)
! OR, OR.B (logical OR)
! PREF (prefetch data to cache)
! ROTCL (rotate with carry, left) ROTCR (rotate with carry, right)
! ROTL (rotate [shift] left) ROTR (rotate [shift] right)
! RTS (return from subroutine) [PR->PC]
! SETS (set S flag) SETT (set T flag)
! SHAD (Shift arithmatically dynamically) [left and right arith shift]
! SHAL (shift left by one bit, moving T in)
! SHAR (shift right arith by one bit, shifting into T)
! SHLD (shift left dynamically) [meaning amount in reg]
! SHLL (shift left locgically, by one bit)
! SHLL2, SHLL8, SHLL16 (shift left by 2, 8, or 16 bits)
! SHLR (shift right logically, by one bit)
! SHLR2, SHLR8, SHLR16 (shift right by 2,8 ,or 16 bits)
! SUB (subtract) SUBC (subtract with carry)
! SUBV (subtract with overflow)
! SWAP.B SWAP.W (swap bytes)
! TAS (test and set) [for SMP]
! TRAPA (trap always) [system call]
! TST (test)
! XOR, XOR.B (exclusive or)
! XTRCT (extract middle 32 bits fro two registers paired)
! Syscalls
! number in r3, args in r4,r5,r6,r7,r0,r1
! use the "trapa" instruction. possibly 0x10+num_arguments
! result returned in r0
! r15 is stack pointer, r14 is frame pointer
! Optimizing
! + 1169 - Original working version
! + 1061 - Remove debugging hooks
! + 1049 - optimize/remove branch delay slots in lzss code
! + 1025 - optimize/remove branch delay slots in sysinfo code
! + 1021 - convert find_string into a loop
! + 1001 - optimize all but num_to_ascii
! + 994 - optimize num_to ascii. Wish I could put the 16 divide
! instructions in a loop somehow, that's 32 bytes there.
.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_READ, 3
.equ SYSCALL_WRITE, 4
.equ SYSCALL_OPEN, 5
.equ SYSCALL_CLOSE, 6
.equ SYSCALL_SYSINFO, 116
.equ SYSCALL_UNAME, 122
!
.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
mov.l @(out_addr-.,pc),r8 ! point r8 to out_buffer
mov r8,r10 ! copy for later
mov.l @(R-.,pc),r0 ! r is in r0
mov.l @(logo_addr-.,pc),r3 ! r3 points to logo data
mov.l @(logo_end_addr-.,pc),r7! r7 points to logo end
mov.l @(text_addr-.,pc),r9 ! r9 points to text buf
decompression_loop:
mov #8,r5 ! shift count
mov.b @r3+,r1 ! load a byte, increment pointer
test_flags:
cmp/ge r7,r3 ! have we reached the end?
bt done_logo ! if so, exit
! bt has no delay slot
shlr r1 ! shift bottom bit into carry flag
bt discrete_char ! if set, we jump to discrete char
! bt has no delay slot
offset_length:
mov.b @r3+,r12 ! load a byte, increment pointer
extu.b r12,r12
mov.b @r3+,r4 ! load a byte, increment pointer
! we can't load halfword as no unaligned loads
extu.b r4,r4
shll8 r4
or r4,r12 ! merge back into 16 bits
! this has match_length and match_position
! no need to mask r12, as we do it
! by default in output_loop
mov r12,r6 ! r6 will hold the count
shlr8 r6 ! assuming P_BITS is 10
shlr2 r6 ! have to shift in 2 parts
add #(THRESHOLD+1),r6
! r6 = (r4 >> P_BITS) + THRESHOLD + 1
! (=match_length)
output_loop:
mov.l @(pos_mask-.,pc),r13 ! urgh, can't handle simple constants
and r13,r12 ! mask it
mov r9,r13
add r12,r13
mov.b @r13,r4 ! load byte from text_buf[r12]
add #1,r12 ! increment pointer
store_byte:
mov.b r4,@r10 ! store a byte
add #1,r10 ! increment pointer
mov.b r4,@(r0,r9) ! store a byte to text_buf[r]
add #1,r0 ! r++
mov.w @(n_val-.,pc),r2
add #-1,r2 ! grrr no way to get this easier
and r2,r0 ! mask r
dt r6 ! decement count
bf output_loop ! repeat until k>j
! bf has no branch delay slot
dt r5 ! dt--. If dt=0, T=1
bf test_flags ! if not, re-load flags
! bf has no branch delay slot
bra decompression_loop ! loop
nop ! wasted branch delay
discrete_char:
mov.b @r3+,r4 ! load a byte, increment pointer
bra store_byte ! and store it (and delay slot)
mov #1,r6 ! we set r6 to one so byte
! will be output once
! end of LZSS code
done_logo:
bsr write_stdout ! print the logo
mov r8,r5 ! buffer we are printing to (br delay)
!==========================
! PRINT VERSION
!==========================
first_line:
mov r8,r10 ! copy in output pointer
mov #SYSCALL_UNAME,r3 ! uname number
mov.l @(uname_addr-.,pc),r4 ! uname struct
trapa #0x11 ! do syscall
bsr strcat_r4 ! os-name from uname "Linux"
mov r4,r11 ! save pnter for later (br delay)
bsr strcat_r9 ! call strcat
mov.l @(data_addr-.,pc),r9 ! source is " Version " (br delay)
add #(U_RELEASE/2),r11 ! too big to fit in 8bit offset
mov r11,r3 ! save pointer for later
add #(U_RELEASE/2),r3
bsr strcat_r4 ! call strcat
mov r3,r4 ! version from uname, "2.6.20" (brdly)
bsr strcat_r9 ! source is ", Compiled "
nop ! delay slot (wasted)
add #(U_VERSION/3),r3 ! point to compiled date
bsr strcat_r4 ! call strcat
mov r3,r4 ! point to compiled data (br delay)
bsr strcat_r9 ! source is "\n"
nop ! delay slot (wasted)
bsr center_and_print ! center and print
nop ! branch delay slot (wasted)
!===============================
! Middle-Line
!===============================
middle_line:
!=========
! Load /proc/cpuinfo into buffer
!=========
mov r8,r10 ! restore output pointer
mov #SYSCALL_OPEN,r3
mov.l @(cpu_addr-.,pc),r4 ! uname struct
! '/proc/cpuinfo'
mov #0,r5 ! 0 = O_RDONLY <bits/fcntl.h>
trapa #0x12 ! open() fd returned in r0
mov r0,r1 ! save our fd
mov #SYSCALL_READ,r3
mov r1,r4 ! move in fd
mov.l @(disk_addr-.,pc),r5 ! load pointer to disk address
mov #16,r6
shll8 r6 ! load 4096 (16<<8)
! 4096 is maximum size of proc file ;)
trapa #0x13 ! read()
mov #SYSCALL_CLOSE,r3
mov r1,r4 ! restore fd
trapa #0x11 ! close (to be correct)
!=============
! Number of CPUs
!=============
number_of_cpus:
bsr strcat_r9 ! assume no SMP, print "One"
nop ! branch delay slot (wasted)
!=========
! MHz
!=========
print_mhz:
bsr find_string ! call find_string
mov.l @(mhz_search-.,pc),r4 ! look for "MHz" (br delay)
bsr strcat_r9 ! print MHz
nop ! branch delay slot (wasted)
!=========
! Chip Name
!=========
chip_name:
bsr find_string ! call find_string
mov.l @(family_search-.,pc),r4 ! find "mily"
bsr strcat_r9 ! print " Processor, "
nop ! branch delay (wasted)
!========
! RAM
!========
mov #SYSCALL_SYSINFO,r3 ! sysinfo() syscall
mov.l @(sys_addr-.,pc),r4 ! sysinfo addr
trapa #0x11
mov.l @(S_TOTALRAM,r4),r4
! size in bytes of RAM
shlr16 r4 ! divide by 1024*1024 to get M
shlr2 r4 ! we shift by 16,2,2
shlr2 r4 ! because sh can't do >>20 direct
bsr num_to_ascii ! convert to ASCII
mov #1,r3 ! use strcat
bsr strcat_r9 ! print 'M RAM, '
nop ! branch delay (wasted)
!=========
! Bogomips
!=========
bsr find_string ! call find_string
mov.l @(bogo_search-.,pc),r4 ! look for 'mips' (br delay)
bsr strcat_r9 ! print bogomips total
nop ! branch delay (wasted)
bsr center_and_print ! center and print
nop ! branch delay (wasted)
!=================================
! Print Host Name
!=================================
last_line:
mov r8,r10 ! restore out_buffer
bsr strcat_r4 ! call strcat
mov r11,r4 ! restore uname ptr (branch delay)
bsr center_and_print ! center and print
nop ! branch delay (wasted)
bsr write_stdout ! restore colors, print a few linefeeds
mov r9,r5 ! point to linefeeds (branch delay)
!================================
! Exit
!================================
exit:
mov #SYSCALL_EXIT,r3
mov #0,r4 ! result is zero
trapa #0x11 ! and exit
!=======================================
! Constants used by the logo code
! (have to be within 256 bytes of use)
!=======================================
.align 2
out_addr: .long out_buffer
logo_addr: .long logo
logo_end_addr: .long logo_end
text_addr: .long text_buf
pos_mask: .long ((POSITION_MASK<<8)+0xff)
R: .long N-F
.align 1
n_val: .word N
!=================================
! FIND_STRING
!=================================
! r3=char to stop at
! r4=string to find
! r5 trashed
find_string:
mov.l @(disk_addr-.,pc),r5 ! load pointer to disk buffer
find_loop:
! this would be easier with unaligned loads
! but SH doesn't support them
! (this is trickier because qemu-sh4 on x86 does)
! wish we could use
! mov.l @r5,r0
! turn into a loop?
xor r1,r1 ! clear r1
mov #0,r0 ! clear r0
looper:
mov.b @(r0,r5),r14 ! load byte
shll8 r1 ! shift old part
or r14,r1 ! or new part in
add #1,r0 ! increment pointer
cmp/eq #4,r0 ! have we done 4?
bf looper ! if not loop
xor r0,r0 ! was our result 0?
cmp/eq r1,r0
bt done ! if so, off end, done
cmp/eq r4,r1 ! compare to our string
bf/s find_loop ! if no match, loop
add #1,r5 ! incrememnt pointer (br delay)
find_colon:
mov.b @r5+,r0 ! load a byte, increment pointer
cmp/eq #':',r0
bf/s find_colon ! repeat till we find colon
nop ! branch delay slot (wasted)
add #1,r5 ! skip the space
store_loop:
mov.b @r5+,r0 ! load a byte, increment pointer
mov.b r0,@r10 ! store a byte
add #1,r10 ! increment pointer
cmp/eq #'\n',r0 ! is it linefeed?
bf/s store_loop ! if not loop
nop ! branch delay slot
xor r0,r0 ! clear r0
done:
rts ! return
mov.b r0,@-r10 ! replace last value with NUL (brdly)
!================================
! strcat_r9
!================================
! value to cat in r9
! output pointer in r10
! r0 trashed
strcat_r9:
mov.b @r9+,r0 ! load a byte, increment pointer
mov.b r0,@r10 ! store a byte
add #1,r10 ! increment pointer
cmp/eq #0,r0 ! is it zero?
bf strcat_r9 ! if not loop
! bf has no delay slot
rts ! return
add #-1,r10 ! point to one less than null (brdlay)
!================================
! strcat_r4
!================================
! value to cat in r4
! output pointer in r10
! r0 trashed
strcat_r4:
mov.b @r4+,r0 ! load a byte, increment pointer
mov.b r0,@r10 ! store a byte
add #1,r10 ! increment pointer
cmp/eq #0,r0 ! is it zero?
bf strcat_r4 ! if not loop
! bf has no branch delay
rts ! return
add #-1,r10 ! point to one less than null (brdly)
!==============================
! center_and_print
!==============================
! string to center in at output_buffer
center_and_print:
sts.l pr,@-r15 ! store return address on stack
bsr write_stdout
mov.l @(escape_addr-.,pc),r5 ! we want to output ^[[
str_loop2:
mov r10,r0 ! point r0 to out pointer
sub r8,r0 ! get length by subtracting
mov #81,r4 ! we use 81 to not count ending \n
subv r0,r4 ! subtract. T=1 on underflow
bt done_center ! if result negative, don't center
! bt has no branch delay
shlr r4 ! divide by 2
xor r0,r0
addc r0,r4 ! round
bsr num_to_ascii ! print number of spaces
mov #0,r3 ! print to stdout (branch delay)
bsr write_stdout
mov.l @(c_addr-.,pc),r5 ! we want to output C (brnch delay)
done_center:
lds.l @r15+,pr ! restore return address from stack
mov r8,r5 ! point to output
! fall through to write_stdout
!================================
! WRITE_STDOUT
!================================
! string to write in r5
! r0,r1,r2,r3,r4,r6 trashed
write_stdout:
mov #-1,r0 ! init count
mov #0,r2 !
strlen:
add #1,r0 ! increment count
mov.b @(r0,r5),r1 ! load byte from memory
cmp/eq r2,r1 ! compare against zero
bf/s strlen ! loop
mov r0,r6 ! branch delay slot
mov #SYSCALL_WRITE,r3 ! syscall #
mov #STDOUT,r4 ! write to stdout
trapa #0x13 ! do the syscall
rts ! return
nop ! branch delay slot (wasted)
!=============================
! num_to_ascii
!=============================
! r4 = value to print
! r3 = 0=stdout, 1=strcat
! r2,r5,r6 trashed?
num_to_ascii:
mov.l @(ascii_addr-.,pc),r5 ! point to end of ascii buffer
div_by_10:
mov #10,r6 ! we'll be dividing by 10
shll16 r6
div0u ! set up for unsigned division
mov r4,r2
divloop:
div1 r6,r2 ! can't do this in a loop
div1 r6,r2 ! because it depends on value of T
div1 r6,r2 ! and can't compare for loop end
div1 r6,r2 ! without setting T
div1 r6,r2
div1 r6,r2 ! could we be clever with rotates
div1 r6,r2 ! to save/restore the T book somehow?
div1 r6,r2
div1 r6,r2
div1 r6,r2
div1 r6,r2
div1 r6,r2
div1 r6,r2
div1 r6,r2
div1 r6,r2
div1 r6,r2
rotcl r2
extu.w r2,r2
mov #10,r6
! Q is in r2
mul.l r6,r2 ! multiply Q by 10, store in MACL
sts macl,r0 ! move macl to r0
mov r4,r6
sub r0,r6 ! subtract, R is now in r6
add #0x30,r6 ! convert to ascii
mov.b r6,@-r5 ! store a byte, decrement pointer
mov r2,r4 ! move Q in for next divide
xor r0,r0
cmp/eq r0,r4
bf div_by_10 ! if Q not zero, loop
! bf has no branch delay
write_out:
cmp/eq r3,r0 ! r0 should still be zero
bt write_stdout ! if r3==0, goto stdout
! bt has no branch delay
bra strcat_r4 ! if 1, strcat
mov r5,r4 ! but string in right place (brdelay)
.align 2
cpu_addr: .long cpuinfo
data_addr: .long data_begin
uname_addr: .long uname_info
disk_addr: .long disk_buffer
sys_addr: .long sysinfo_buff
escape_addr: .long escape
ascii_addr: .long (ascii_buffer+10)
c_addr: .long C
family_search: .long 'm'<<24+'i'<<16+'l'<<8+'y'
mhz_search: .long 'u'<<24+' '<<16+'c'<<8+'l'
bogo_search: .long 'm'<<24+'i'<<16+'p'<<8+'s'
.align 1
!===========================================================================
! section .data
!===========================================================================
.data
data_begin:
ver_string: .ascii " Version \0"
compiled_string: .ascii ", Compiled \0"
linefeed: .ascii "\n\0"
one: .ascii "One \0"
mhz: .ascii " \0"
processor: .ascii " Processor, \0"
ram_comma: .ascii "M RAM, \0"
bogo_total: .ascii " Bogomips Total\n\0"
default_colors: .ascii "\033[0m\n\n\0"
escape: .ascii "\033[\0"
C: .ascii "C\0"
.ifdef FAKE_PROC
cpuinfo: .ascii "proc/cpui.sh3\0"
.else
cpuinfo: .ascii "/proc/cpuinfo\0"
.endif
.include "logo.lzss_new"
.align 2
!============================================================================
! section .bss
!============================================================================
!.bss
bss_begin:
.comm uname_info,(65*6)
.comm sysinfo_buff,(64)
.comm ascii_buffer,10
.comm text_buf, (N+F-1)
.comm disk_buffer,4096 ! we cheat!!!!
.comm out_buffer,16384
! see /usr/src/linux/include/linux/kernel.h