kvm has a bug with instructions of the form opcode $imm, displ(%%rip)
Where the effective address was not calculated correctly. Test it now. Signed-off-by: Avi Kivity <[email protected]> --- x86/emulator.c | 17 +++++++++++++++++ 1 files changed, 17 insertions(+), 0 deletions(-) diff --git a/x86/emulator.c b/x86/emulator.c index 967f2a4..d4f0363 100644 --- a/x86/emulator.c +++ b/x86/emulator.c @@ -627,15 +627,31 @@ static void test_sse(sse_union *mem) report("movdqu (write)", sseeq(mem, &v)); } +static void test_rip_relative(unsigned *mem, char *insn_ram) +{ + /* movb $1, mem+2(%rip) */ + insn_ram[0] = 0xc6; + insn_ram[1] = 0x05; + *(unsigned *)&insn_ram[2] = 2 + (char *)mem - (insn_ram + 7); + insn_ram[6] = 0x01; + /* ret */ + insn_ram[7] = 0xc3; + + *mem = 0; + asm("callq *%1" : "+m"(*mem) : "r"(insn_ram)); + report("movb $imm, 0(%rip)", *mem == 0x10000); +} int main() { void *mem; + void *insn_ram; unsigned long t1, t2; setup_vm(); setup_idt(); mem = vmap(IORAM_BASE_PHYS, IORAM_LEN); + insn_ram = vmalloc(4096); // test mov reg, r/m and mov r/m, reg t1 = 0x123456789abcdef; @@ -667,6 +683,7 @@ int main() test_imul(mem); test_div(mem); test_sse(mem); + test_rip_relative(mem, insn_ram); printf("\nSUMMARY: %d tests, %d failures\n", tests, fails); return fails ? 1 : 0; -- 1.7.5.3 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
