/* ARM assembly AARCH64 Raspberry PI 3B */
/*  program filelen64.s   */

/************************************/
/* Constantes                       */
/************************************/
/* for this file see task include a file in language AArch64 assembly*/
.include "../includeConstantesARM64.inc"

.equ FSTAT,  0x50

/************************************/
/* structure de type   stat  : file infos   */
/************************************/
    .struct  0
Stat_dev_t:               /* ID of device containing file */
    .struct Stat_dev_t + 8
Stat_ino_t:              /* inode */
    .struct Stat_ino_t + 8
Stat_mode_t:              /* File type and mode */
    .struct Stat_mode_t + 4
Stat_nlink_t:               /* Number of hard links */
    .struct Stat_nlink_t + 4
Stat_uid_t:               /* User ID of owner */
    .struct Stat_uid_t + 4
Stat_gid_t:                 /* Group ID of owner */
    .struct Stat_gid_t + 4
Stat_rdev_t:                /* Device ID (if special file) */
    .struct Stat_rdev_t + 8
Stat_size_deb:           /* la taille est sur 8 octets si gros fichiers */
     .struct Stat_size_deb + 8
Stat_size_t:                /* Total size, in bytes */
    .struct Stat_size_t + 8
Stat_blksize_t:                /* Block size for filesystem I/O */
    .struct Stat_blksize_t + 8
Stat_blkcnt_t:               /* Number of 512B blocks allocated */
    .struct Stat_blkcnt_t + 8
Stat_atime:               /*   date et heure fichier */
    .struct Stat_atime + 8
Stat_mtime:               /*   date et heure modif fichier */
    .struct Stat_atime + 8
Stat_ctime:               /*   date et heure creation fichier */
    .struct Stat_atime + 8
Stat_End:

/*********************************/
/* Initialized data              */
/*********************************/
.data
szMessResult:       .asciz " File size = "
szCarriageReturn:   .asciz "\n"
szMessErrOpen:      .asciz "Error open file\n"
szMessErrStat:      .asciz "Error stats file\n"
szFileName:         .asciz "input.txt"
szFileName1:        .asciz "../../../input.txt"

/*********************************/
/* UnInitialized data            */
/*********************************/
.bss
sZoneConv:           .skip 24
sBuffer:             .skip Stat_End
/*********************************/
/*  code section                 */
/*********************************/
.text
.global main
main:
    ldr x0,qAdrszFileName       // file name
    bl filesize
    cmp x0,#0
    blt 100f
    ldr x1,qAdrsZoneConv
    bl conversion10             // call décimal conversion
    mov x0,#4
    ldr x1,qAdrszFileName
    ldr x2,qAdrszMessResult
    ldr x3,qAdrsZoneConv        // insert conversion in message
    ldr x4,qAdrszCarriageReturn
    stp x4,x4,[sp,-16]!         // save  registers
    bl displayStrings           // display message
    add sp,sp,#16                   // 1 parameter on stack

    ldr x0,qAdrszFileName1       // file name
    bl filesize
    cmp x0,#0
    blt 100f
    ldr x1,qAdrsZoneConv
    bl conversion10             // call décimal conversion
    ldr x0,qAdrsZoneConv
    mov x0,#4
    ldr x1,qAdrszFileName1
    ldr x2,qAdrszMessResult
    ldr x3,qAdrsZoneConv        // insert conversion in message
    ldr x4,qAdrszCarriageReturn
    stp x4,x4,[sp,-16]!         // save  registers
    bl displayStrings           // display message
    add sp,sp,#16                  // 1 parameter on stack

100:                            // standard end of the program
    mov x0, #0                  // return code
    mov x8,EXIT
    svc #0                      // perform the system call
qAdrszCarriageReturn:    .quad szCarriageReturn
qAdrsZoneConv:           .quad sZoneConv
qAdrszMessResult:        .quad szMessResult
qAdrszFileName:          .quad szFileName
qAdrszFileName1:         .quad szFileName1
qAdrsBuffer:             .quad sBuffer
qAdrszMessErrOpen:       .quad szMessErrOpen
qAdrszMessErrStat:       .quad szMessErrStat
/***************************************************/
/*   display multi strings                    */
/***************************************************/
/* x0  contains number strings address */
filesize:                       // INFO:  filesize
    stp x1,lr,[sp,-16]!         // save  registers
    stp x2,x3,[sp,-16]!         // save  registers
    stp x4,x5,[sp,-16]!         // save  registers
    stp x6,x7,[sp,-16]!         // save  registers
    stp x8,x9,[sp,-16]!         // save  registers
    mov x1,x0
    mov x0,#AT_FDCWD
    mov x2,#O_RDWR              //  flags
    mov x3,#0                   // mode
    mov x8,#OPEN
    svc 0
    cmp x0,#0                   // error ?
    ble 99f
    mov x8,x0                   // Fd save
    ldr x1,qAdrsBuffer          // buffer address
    mov x8,#FSTAT
    svc 0
    cmp x0,#0
    blt 98f
    ldr x1,qAdrsBuffer          // buffer address
    ldr x4,[x1,#Stat_size_t]    // file size
    mov x0,x8
    mov x8,CLOSE
    mov x0,x4                   // return size
    b 100f
98:
    ldr x0,qAdrszMessErrStat
    bl affichageMess
    mov x0,#-1
    b 100f
99:
    ldr x0,qAdrszMessErrOpen
    bl affichageMess
    mov x0,#-1
100:
    ldp x8,x9,[sp],16        // restaur  registers
    ldp x6,x7,[sp],16        // restaur  registers
    ldp x4,x5,[sp],16        // restaur  registers
    ldp x2,x3,[sp],16        // restaur  registers
    ldp x1,lr,[sp],16            // restaur  registers
    ret
/***************************************************/
/*   display multi strings                    */
/***************************************************/
/* x0  contains number strings address */
/* x1 address string1 */
/* x2 address string2 */
/* x3 address string3 */
/* other address on the stack */
/* thinck to add  number other address * 4 to add to the stack */
displayStrings:            // INFO:  displayStrings
    stp x1,lr,[sp,-16]!          // save  registers
    stp x2,x3,[sp,-16]!          // save  registers
    stp x4,x5,[sp,-16]!          // save  registers
    add fp,sp,#48          // save paraméters address (6 registers saved * 4 bytes)
    mov x4,x0              // save strings number
    cmp x4,#0              // 0 string -> end
    ble 100f
    mov x0,x1              // string 1
    bl affichageMess
    cmp x4,#1              // number > 1
    ble 100f
    mov x0,x2
    bl affichageMess
    cmp x4,#2
    ble 100f
    mov x0,x3
    bl affichageMess
    cmp x4,#3
    ble 100f
    mov x3,#3
    sub x2,x4,#4
1:                            // loop extract address string on stack
    ldr x0,[fp,x2,lsl #3]
    bl affichageMess
    subs x2,x2,#1
    bge 1b
100:
    ldp x4,x5,[sp],16        // restaur  registers
    ldp x2,x3,[sp],16        // restaur  registers
    ldp x1,lr,[sp],16            // restaur  registers
    ret
/***************************************************/
/*      ROUTINES INCLUDE                           */
/***************************************************/
/* for this file see task include a file in language AArch64 assembly */
.include "../includeARM64.inc"