void dcbInitThunk(DCThunk* p, void (*entry)())
{
/*
Thunk Register: $t4 ($12)
According to o32abi: $t9
'The Linux/MIPS convention is that all PIC calls use t9 to hold the address of
the called function.' [See MIPS Run, p.413]
mips thunk code:
lui $t4, %hi(p)
lui $t9, %hi(entry)
ori $t9, $t9, %lo(entry)
jr $t9
ori $t4, $t4, %lo(p) ; branch delay slot
thunk.o: file format elf32-tradbigmips
Disassembly of section .text:
00000000 <thunk>:
0: 3c0c0000 lui t4,0x0
4: 3c190000 lui t9,0x0
8: 37390000 ori t9,t9,0x0
c: 03200008 jr t9
10: 00200825 move at,at
14: 358c0000 ori t4,t4,0x0
18: 00200825 move at,at
1c: 00200825 move at,at
*/
#if defined(DC__Endian_BIG)
p->data[0] = 0x3c0c; p->data[1] = hi16(p); /* lui $t4, hi(p) */
p->data[2] = 0x3c19; p->data[3] = hi16(entry); /* lui $t9, hi(entry) */
p->data[4] = 0x3739; p->data[5] = lo16(entry); /* ori $t9, $t9, lo(entry) */
p->jump = 0x03200008; /* jr $t9 */
p->bddt[0] = 0x358c; p->bddt[1] = lo16(p); /* ori $t4, $t4, lo(p) - branch delay slot */
#else /* defined(DC__Endian_LITTLE) */
p->data[1] = 0x3c0c; p->data[0] = hi16(p); /* lui $t4, hi(p) */
p->data[3] = 0x3c19; p->data[2] = hi16(entry); /* lui $t9, hi(entry) */
p->data[5] = 0x3739; p->data[4] = lo16(entry); /* ori $t9, $t9, lo(entry) */
p->jump = 0x03200008; /* jr $t9 */
p->bddt[1] = 0x358c; p->bddt[0] = lo16(p); /* ori $t4, $t4, lo(p) - branch delay slot */
#endif
}
void dcbInitThunk(DCThunk* p, void (*entry)())
{
/*
mips thunk code:
lui $t4, hi(p)
lui $t5, hi(entry)
ori $t5, $t5, lo(entry)
jr $t5
ori $t4, $t4, lo(p) - branch delay slot
*/
p->data[0] = hi16(p); /* lui $t4, hi(p) */
p->data[1] = 0x3c0c;
p->data[2] = hi16(entry); /* lui $t5, hi(entry) */
p->data[3] = 0x3c0d;
p->data[4] = lo16(entry); /* ori $t5, $t5, lo(entry) */
p->data[5] = 0x35ad;
p->jump = 0x01a00008; /* jr $t5 */
p->bddt[0] = lo16(p); /* ori $t4, $t4, lo(p) - branch delay slot */
p->bddt[1] = 0x358c;
}
void dcbInitThunk(DCThunk* p, void (*entry)())
{
/*
0: 3d 60 00 00 lis r11,0
4: 61 6b 00 01 ori r11,r11,1
8: 81 82 00 14 lwz r12,20(r2)
c: 7d 89 03 a6 mtctr r12
10: 4e 80 04 20 bctr
*/
p->code_load_hi = 0x3d60U; /* lis r11, HI16(p) */
p->addr_self_hi = hi16(p);
p->code_load_lo = 0x616bU; /* ori r11, r11, LO16(p) */
p->addr_self_lo = lo16(p);
p->code_jump[0] = 0x818b0014U; /* lwz r12, 20(r11) */
p->code_jump[1] = 0x7d8903a6U; /* mtclr r12 */
p->code_jump[2] = 0x4e800420U; /* bctr */
p->addr_entry = entry;
}
void dcbInitThunk(DCThunk* p, void (*entry)())
{
/*
ppc32 thunk code:
lis r2 , HI16(p)
ori r2 , r2, LO16(p)
lwz r12, 20(r2)
mtctr r12
bctr
*/
p->code_load_hi = 0x3c40U; /* lis r2, HI16(p) */
p->addr_self_hi = hi16(p);
p->code_load_lo = 0x6042U; /* ori r2, r2, LO16(p) */
p->addr_self_lo = lo16(p);
p->code_jump[0] = 0x81820014U; /* lwz r12, 20(r2) */
p->code_jump[1] = 0x7d8903a6U; /* mtclr r12 */
p->code_jump[2] = 0x4e800420U; /* bctr */
p->addr_entry = entry;
}
