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As AMD64 architecture volume 1 chapter 3.1.2 says, high 32 bits of %rflags

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are resevered, they can be written with anything, but they always read
as zero, we should simulate it in set_regs() as we are reading/writting
real hardware %rflags register.
This commit is contained in:
davidxu 2004-08-10 12:15:27 +00:00
parent 87253c6200
commit 8c3963846d
1 changed files with 4 additions and 3 deletions
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7
sys/amd64/amd64/machdep.c
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@ -1348,10 +1348,11 @@ set_regs(struct thread *td, struct reg *regs)
{
struct pcb *pcb;
struct trapframe *tp;
register_t rflags;
tp = td->td_frame;
if (!EFL_SECURE(regs->r_rflags, tp->tf_rflags) ||
!CS_SECURE(regs->r_cs))
rflags = regs->r_rflags & 0xffffffff;
if (!EFL_SECURE(rflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs))
return (EINVAL);
tp->tf_r15 = regs->r_r15;
tp->tf_r14 = regs->r_r14;
@ -1370,7 +1371,7 @@ set_regs(struct thread *td, struct reg *regs)
tp->tf_rax = regs->r_rax;
tp->tf_rip = regs->r_rip;
tp->tf_cs = regs->r_cs;
tp->tf_rflags = regs->r_rflags;
tp->tf_rflags = rflags;
tp->tf_rsp = regs->r_rsp;
tp->tf_ss = regs->r_ss;
pcb = td->td_pcb;