83 lines
2.1 KiB
C++
83 lines
2.1 KiB
C++
namespace factor {
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#ifdef FACTOR_64
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#define FACTOR_CPU_STRING "ppc.64"
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#else
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#define FACTOR_CPU_STRING "ppc.32"
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#endif
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#define CALLSTACK_BOTTOM(ctx) (ctx->callstack_seg->end - 32)
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// In the instruction sequence:
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// LOAD32 r3,...
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// B blah
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// the offset from the immediate operand to LOAD32 to the instruction after
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// the branch is one instruction.
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static const fixnum xt_tail_pic_offset = 4;
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inline static void check_call_site(cell return_address) {
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uint32_t insn = *(uint32_t*)return_address;
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// Check that absolute bit is 0
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FACTOR_ASSERT((insn & 0x2) == 0x0);
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// Check that instruction is branch
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FACTOR_ASSERT((insn >> 26) == 0x12);
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}
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static const uint32_t b_mask = 0x3fffffc;
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inline static void* get_call_target(cell return_address) {
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return_address -= 4;
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check_call_site(return_address);
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uint32_t insn = *(uint32_t*)return_address;
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uint32_t unsigned_addr = (insn & b_mask);
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int32_t signed_addr = (int32_t)(unsigned_addr << 6) >> 6;
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return (void*)(signed_addr + return_address);
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}
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inline static void set_call_target(cell return_address, cell target) {
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return_address -= 4;
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check_call_site(return_address);
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uint32_t insn = *(uint32_t*)return_address;
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fixnum relative_address = target - return_address;
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insn = ((insn & ~b_mask) | (relative_address & b_mask));
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*(uint32_t*)return_address = insn;
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// Flush the cache line containing the call we just patched
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__asm__ __volatile__("icbi 0, %0\n"
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"sync\n" ::"r"(return_address)
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:);
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}
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inline static bool tail_call_site_p(cell return_address) {
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return_address -= 4;
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uint32_t insn = *(uint32_t*)return_address;
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return (insn & 0x1) == 0;
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}
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inline static unsigned int fpu_status(unsigned int status) {
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unsigned int r = 0;
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if (status & 0x20000000)
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r |= FP_TRAP_INVALID_OPERATION;
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if (status & 0x10000000)
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r |= FP_TRAP_OVERFLOW;
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if (status & 0x08000000)
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r |= FP_TRAP_UNDERFLOW;
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if (status & 0x04000000)
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r |= FP_TRAP_ZERO_DIVIDE;
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if (status & 0x02000000)
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r |= FP_TRAP_INEXACT;
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return r;
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}
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// Defined in assembly
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VM_C_API void flush_icache(cell start, cell len);
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}
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