diff options
Diffstat (limited to 'usr/src')
| -rw-r--r-- | usr/src/uts/intel/ia32/ml/exception.s | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/usr/src/uts/intel/ia32/ml/exception.s b/usr/src/uts/intel/ia32/ml/exception.s index 08817134a9..c7e6e843f7 100644 --- a/usr/src/uts/intel/ia32/ml/exception.s +++ b/usr/src/uts/intel/ia32/ml/exception.s @@ -116,9 +116,23 @@ ndptrap_frstor(void) * Nobody said that the design of sysenter was particularly * elegant, did they? */ + pushq %r11 + + /* + * At this point the stack looks like this: + * + * (high address) r_ss + * r_rsp + * r_rfl + * r_cs + * r_rip <-- %rsp + 24 + * r_err <-- %rsp + 16 + * r_trapno <-- %rsp + 8 + * (low address) %r11 <-- %rsp + */ leaq sys_sysenter(%rip), %r11 - cmpq %r11, 8(%rsp) + cmpq %r11, 24(%rsp) /* Compare to saved r_rip on the stack */ jne 1f SWAPGS 1: popq %r11 |