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Fix trap handler in WSL environment.

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This commit is contained in:
losfair 2019-07-15 23:00:27 +08:00
parent 8a471cc235
commit 263afa8a80
1 changed files with 13 additions and 3 deletions
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16
lib/runtime-core/src/fault.rs
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@ -304,8 +304,9 @@ pub struct FaultInfo {
#[cfg(all(target_os = "linux", target_arch = "x86_64"))]
pub unsafe fn get_fault_info(siginfo: *const c_void, ucontext: *const c_void) -> FaultInfo {
use libc::{
_libc_xmmreg, ucontext_t, REG_R10, REG_R11, REG_R12, REG_R13, REG_R14, REG_R15, REG_R8,
REG_R9, REG_RAX, REG_RBP, REG_RBX, REG_RCX, REG_RDI, REG_RDX, REG_RIP, REG_RSI, REG_RSP,
_libc_fpstate, _libc_xmmreg, mcontext_t, ucontext_t, REG_R10, REG_R11, REG_R12, REG_R13,
REG_R14, REG_R15, REG_R8, REG_R9, REG_RAX, REG_RBP, REG_RBX, REG_RCX, REG_RDI, REG_RDX,
REG_RIP, REG_RSI, REG_RSP,
};
fn read_xmm(reg: &_libc_xmmreg) -> u64 {
@ -327,7 +328,16 @@ pub unsafe fn get_fault_info(siginfo: *const c_void, ucontext: *const c_void) ->
let ucontext = ucontext as *const ucontext_t;
let gregs = &(*ucontext).uc_mcontext.gregs;
let fpregs = &*(*ucontext).uc_mcontext.fpregs;
// WSL bug: (*ucontext).uc_mcontext.fpregs is always null.
let fpregs: &_libc_fpstate =
&*(((&(*ucontext).uc_mcontext) as *const mcontext_t).offset(1) as *const _libc_fpstate);
if !(*ucontext).uc_mcontext.fpregs.is_null() {
assert_eq!(
(*ucontext).uc_mcontext.fpregs as *const _,
fpregs as *const _
);
}
let mut known_registers: [Option<u64>; 24] = [None; 24];
known_registers[X64Register::GPR(GPR::R15).to_index().0] = Some(gregs[REG_R15 as usize] as _);