83 lines
2.0 KiB
C++
83 lines
2.0 KiB
C++
namespace factor
|
|
{
|
|
|
|
#define FACTOR_CPU_STRING "ppc"
|
|
|
|
/* In the instruction sequence:
|
|
|
|
LOAD32 r3,...
|
|
B blah
|
|
|
|
the offset from the immediate operand to LOAD32 to the instruction after
|
|
the branch is one instruction. */
|
|
static const fixnum xt_tail_pic_offset = 4;
|
|
|
|
inline static void check_call_site(cell return_address)
|
|
{
|
|
#ifdef FACTOR_DEBUG
|
|
cell insn = *(cell *)return_address;
|
|
/* Check that absolute bit is 0 */
|
|
assert((insn & 0x2) == 0x0);
|
|
/* Check that instruction is branch */
|
|
assert((insn >> 26) == 0x12);
|
|
#endif
|
|
}
|
|
|
|
static const cell b_mask = 0x3fffffc;
|
|
|
|
inline static void *get_call_target(cell return_address)
|
|
{
|
|
return_address -= sizeof(cell);
|
|
check_call_site(return_address);
|
|
|
|
cell insn = *(cell *)return_address;
|
|
cell unsigned_addr = (insn & b_mask);
|
|
fixnum signed_addr = (fixnum)(unsigned_addr << 6) >> 6;
|
|
return (void *)(signed_addr + return_address);
|
|
}
|
|
|
|
inline static void set_call_target(cell return_address, void *target)
|
|
{
|
|
return_address -= sizeof(cell);
|
|
check_call_site(return_address);
|
|
|
|
cell insn = *(cell *)return_address;
|
|
|
|
fixnum relative_address = ((cell)target - return_address);
|
|
insn = ((insn & ~b_mask) | (relative_address & b_mask));
|
|
*(cell *)return_address = insn;
|
|
|
|
/* Flush the cache line containing the call we just patched */
|
|
__asm__ __volatile__ ("icbi 0, %0\n" "sync\n"::"r" (return_address):);
|
|
}
|
|
|
|
inline static bool tail_call_site_p(cell return_address)
|
|
{
|
|
return_address -= sizeof(cell);
|
|
cell insn = *(cell *)return_address;
|
|
return (insn & 0x1) == 0;
|
|
}
|
|
|
|
inline static unsigned int fpu_status(unsigned int status)
|
|
{
|
|
unsigned int r = 0;
|
|
|
|
if (status & 0x20000000)
|
|
r |= FP_TRAP_INVALID_OPERATION;
|
|
if (status & 0x10000000)
|
|
r |= FP_TRAP_OVERFLOW;
|
|
if (status & 0x08000000)
|
|
r |= FP_TRAP_UNDERFLOW;
|
|
if (status & 0x04000000)
|
|
r |= FP_TRAP_ZERO_DIVIDE;
|
|
if (status & 0x02000000)
|
|
r |= FP_TRAP_INEXACT;
|
|
|
|
return r;
|
|
}
|
|
|
|
/* Defined in assembly */
|
|
VM_C_API void flush_icache(cell start, cell len);
|
|
|
|
}
|