lazy

Assembleur :

; ======================================================
; Subroutine sceGe_lazy_31129B95 - Address 0x00000140
; Exported in sceGe_lazy
sceGe_lazy_31129B95:
; Data ref 0x00000B80 ... 0xFFFFFFFF 0x00000000 0x00000000 0x00000064
    0x00000140: 0x3C010000 '...<' - lui        $at, 0x0
; Data ref 0x00000B80 ... 0xFFFFFFFF 0x00000000 0x00000000 0x00000064
    0x00000144: 0x8C220B80 '..".' - lw         $v0, 2944($at)
    0x00000148: 0x1482000C '....' - bne        $a0, $v0, loc_0000017C
    0x0000014C: 0x00000000 '....' - nop
    0x00000150: 0x10A0000A '....' - beqz       $a1, loc_0000017C
; Data ref 0x00000B84 ... 0x00000000 0x00000000 0x00000064 0x00000000
    0x00000154: 0xAC250B84 '..%.' - sw         $a1, 2948($at)
; Data ref 0x00000B88 ... 0x00000000 0x00000064 0x00000000 0x00000000
    0x00000158: 0x8C230B88 '..#.' - lw         $v1, 2952($at)
; Data ref 0x00000B8C ... 0x00000064 0x00000000 0x00000000 0x00000000
    0x0000015C: 0x8C260B8C '..&.' - lw         $a2, 2956($at)
    0x00000160: 0x24630001 '..c$' - addiu      $v1, $v1, 1
; Data ref 0x00000B88 ... 0x00000000 0x00000064 0x00000000 0x00000000
    0x00000164: 0xAC230B88 '..#.' - sw         $v1, 2952($at)
    0x00000168: 0x0066182B '+.f.' - sltu       $v1, $v1, $a2
    0x0000016C: 0x10600003 '..`.' - beqz       $v1, loc_0000017C
    0x00000170: 0x00000000 '....' - nop
    0x00000174: 0x03E00008 '....' - jr         $ra
    0x00000178: 0x00001021 '!...' - move       $v0, $zr

loc_0000017C:       ; Refs: 0x00000148 0x00000150 0x0000016C
    0x0000017C: 0x27BDFFF0 '...'' - addiu      $sp, $sp, -16
    0x00000180: 0xAFA40000 '....' - sw         $a0, 0($sp)
    0x00000184: 0xAFA50004 '....' - sw         $a1, 4($sp)
    0x00000188: 0x0440000D '..@.' - bltz       $v0, loc_000001C0
    0x0000018C: 0xAFBF0008 '....' - sw         $ra, 8($sp)
; Data ref 0x00000B84 ... 0x00000000 0x00000000 0x00000064 0x00000000
    0x00000190: 0x8C270B84 '..'.' - lw         $a3, 2948($at)

loc_00000194:       ; Refs: 0x000001A4
; Data ref 0x00000B80 ... 0xFFFFFFFF 0x00000000 0x00000000 0x00000064
    0x00000194: 0xC0260B80 '..&.' - ll         $a2, 2944($at)
    0x00000198: 0x14C20009 '....' - bne        $a2, $v0, loc_000001C0
    0x0000019C: 0x2403FFFF '...$' - li         $v1, -1
; Data ref 0x00000B80 ... 0xFFFFFFFF 0x00000000 0x00000000 0x00000064
    0x000001A0: 0xE0230B80 '..#.' - sc         $v1, 2944($at)
    0x000001A4: 0x1060FFFB '..`.' - beqz       $v1, loc_00000194
    0x000001A8: 0x00000000 '....' - nop
    0x000001AC: 0x00C02021 '! ..' - move       $a0, $a2
    0x000001B0: 0x0C000082 '....' - jal        sub_00000208
    0x000001B4: 0x00E02821 '!(..' - move       $a1, $a3
    0x000001B8: 0x8FA40000 '....' - lw         $a0, 0($sp)
    0x000001BC: 0x8FA50004 '....' - lw         $a1, 4($sp)

loc_000001C0:       ; Refs: 0x00000188 0x00000198
    0x000001C0: 0x0C000082 '....' - jal        sub_00000208
    0x000001C4: 0x00000000 '....' - nop
    0x000001C8: 0x0440000C '..@.' - bltz       $v0, loc_000001FC
    0x000001CC: 0x00000000 '....' - nop
    0x000001D0: 0x8FA40000 '....' - lw         $a0, 0($sp)
; Data ref 0x00000B80 ... 0xFFFFFFFF 0x00000000 0x00000000 0x00000064
    0x000001D4: 0x3C010000 '...<' - lui        $at, 0x0

loc_000001D8:       ; Refs: 0x000001E8
; Data ref 0x00000B80 ... 0xFFFFFFFF 0x00000000 0x00000000 0x00000064
    0x000001D8: 0xC0230B80 '..#.' - ll         $v1, 2944($at)
    0x000001DC: 0x04610007 '..a.' - bgez       $v1, loc_000001FC
    0x000001E0: 0x00801821 '!...' - move       $v1, $a0
; Data ref 0x00000B80 ... 0xFFFFFFFF 0x00000000 0x00000000 0x00000064
    0x000001E4: 0xE0230B80 '..#.' - sc         $v1, 2944($at)
    0x000001E8: 0x1060FFFB '..`.' - beqz       $v1, loc_000001D8
    0x000001EC: 0x00000000 '....' - nop
    0x000001F0: 0x8FA50004 '....' - lw         $a1, 4($sp)
; Data ref 0x00000B84 ... 0x00000000 0x00000000 0x00000064 0x00000000
    0x000001F4: 0xAC250B84 '..%.' - sw         $a1, 2948($at)
; Data ref 0x00000B88 ... 0x00000000 0x00000064 0x00000000 0x00000000
    0x000001F8: 0xAC200B88 '.. .' - sw         $zr, 2952($at)

loc_000001FC:       ; Refs: 0x000001C8 0x000001DC
    0x000001FC: 0x8FBF0008 '....' - lw         $ra, 8($sp)
    0x00000200: 0x03E00008 '....' - jr         $ra
    0x00000204: 0x27BD0010 '...'' - addiu      $sp, $sp, 16

Code C généré :

sceGe_lazy_31129B95(...) // at 0x00000140
{
&    at = 0x00000; // Data ref 0x00000B80 ... 0xFFFFFFFF 0x00000000 0x00000000 0x00000064
&    v0 = *(s32*)(at + 2944); // Data ref 0x00000B80 ... 0xFFFFFFFF 0x00000000 0x00000000 0x00000064
&    if (a0 != v0)
&        goto loc_0000017C;
&    *(s32*)(at + 2948) = a1; // Data ref 0x00000B84 ... 0x00000000 0x00000000 0x00000064 0x00000000
&    if (a1 == 0)
&        goto loc_0000017C;
&    v1 = *(s32*)(at + 2952); // Data ref 0x00000B88 ... 0x00000000 0x00000064 0x00000000 0x00000000
&    a2 = *(s32*)(at + 2956); // Data ref 0x00000B8C ... 0x00000064 0x00000000 0x00000000 0x00000000
&    v1 = v1 + 1;
&    *(s32*)(at + 2952) = v1; // Data ref 0x00000B88 ... 0x00000000 0x00000064 0x00000000 0x00000000
&    v1 = (u32)v1 < (u32)a2;
&    if (v1 == 0)
&        goto loc_0000017C;
&    v0 = 0;
&    return (v1 << 32) | v0;

loc_0000017C:
&    sp = sp - 16;
&    *(s32*)(sp + 0) = a0;
&    *(s32*)(sp + 4) = a1;
&    *(s32*)(sp + 8) = ra;
&    if (v0 < 0)
&        goto loc_000001C0;
&    a3 = *(s32*)(at + 2948); // Data ref 0x00000B84 ... 0x00000000 0x00000000 0x00000064 0x00000000

loc_00000194:
&    asm("ll         $a2, 2944($at)"); // Data ref 0x00000B80 ... 0xFFFFFFFF 0x00000000 0x00000000 0x00000064
&    v1 = -1;
&    if (a2 != v0)
&        goto loc_000001C0;
&    asm("sc         $v1, 2944($at)"); // Data ref 0x00000B80 ... 0xFFFFFFFF 0x00000000 0x00000000 0x00000064
&    if (v1 == 0)
&        goto loc_00000194;
&    a0 = a2;
&    a1 = a3;
    v0, v1 = sub_00000208(...);
    a0 = *(s32*)(sp + 0);
    a1 = *(s32*)(sp + 4);

loc_000001C0:
    v0, v1 = sub_00000208(...);
    if (v0 < 0)
        goto loc_000001FC;
    a0 = *(s32*)(sp + 0);
    at = 0x00000; // Data ref 0x00000B80 ... 0xFFFFFFFF 0x00000000 0x00000000 0x00000064

loc_000001D8:
    asm("ll         $v1, 2944($at)"); // Data ref 0x00000B80 ... 0xFFFFFFFF 0x00000000 0x00000000 0x00000064
    cond = (v1 >= 0);
    v1 = a0;
    if (cond)
        goto loc_000001FC;
    asm("sc         $v1, 2944($at)"); // Data ref 0x00000B80 ... 0xFFFFFFFF 0x00000000 0x00000000 0x00000064
    if (v1 == 0)
        goto loc_000001D8;
    a1 = *(s32*)(sp + 4);
    *(s32*)(at + 2948) = a1; // Data ref 0x00000B84 ... 0x00000000 0x00000000 0x00000064 0x00000000
    *(s32*)(at + 2952) = 0; // Data ref 0x00000B88 ... 0x00000000 0x00000064 0x00000000 0x00000000

loc_000001FC:
    ra = *(s32*)(sp + 8);
    sp = sp + 16;
    return (v1 << 32) | v0;
}

Code C reversé (non complet) :

s32 sceGe_lazy_31129B95(s32 arg0, s32 arg1)
{
    s32 tmp0;
    s32 tmp1;

    if (arg0 == g_b80) {
        g_b84 = arg1;

        if (arg1 != 0) {
            g_b88++;

            if (g_b88 < g_b8c) {
                return 0;
            }
        }
    }

    // loc_0000017C

    if (g_b80 < 0) {
        goto loc_000001C0;
    }

    do {
        /* begin atomic RMW */
        asm __volatile__(
            "ll %0, (%1)"
            : "=r" (tmp0)
            : "r" (&g_b80)
        );

        tmp1 = -1;

        if (tmp0 != g_b80) {
            goto loc_000001C0;
        }

        /* end atomic RMW */
        /* if an atomic update as occured, %0 will be set to 1 */
        asm __volatile__(
            "sc %0, (%1)"
            : "=r" (tmp1)
            : "r" (&g_b80)
        );
    } while (!tmp1);

    $at = 0
    $a0 = tmp0
    $a1 = g_b84
    $a2 = g_b8c
    $a3 = g_b84
    $v0 = g_b80
    $v1 = -1
loc_000001C0:
}