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Temporarily disable use of Mach ports for trap handling on Darwin.

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This commit is contained in:
Dan Gohman
2018-12-04 19:57:12 -05:00
parent 4ae552c7bd
commit cfd28a7bc5
1 changed files with 22 additions and 8 deletions
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30
lib/execute/signalhandlers/SignalHandlers.cpp
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@@ -1,6 +1,9 @@
//! This file is largely derived from the code in WasmSignalHandlers.cpp in SpiderMonkey:
//!
//! https://dxr.mozilla.org/mozilla-central/source/js/src/wasm/WasmSignalHandlers.cpp
//!
//! Use of Mach ports on Darwin platforms (the USE_APPLE_MACH_PORTS code below) is
//! currently disabled.
#include "SignalHandlers.h"
@@ -12,7 +15,7 @@
#if defined(_WIN32)
# include <winternl.h> // must include before util/Windows.h's `#undef`s
# include "util/Windows.h"
#elif defined(__APPLE__)
#elif defined(USE_APPLE_MACH_PORTS)
# include <mach/exc.h>
# include <mach/mach.h>
# include <pthread.h>
@@ -176,7 +179,7 @@
# define EPC_sig(p) ((p)->uc_mcontext.mc_pc)
# define RFP_sig(p) ((p)->uc_mcontext.mc_regs[30])
# endif
#elif defined(__APPLE__)
#elif defined(USE_APPLE_MACH_PORTS)
# define EIP_sig(p) ((p)->thread.uts.ts32.__eip)
# define EBP_sig(p) ((p)->thread.uts.ts32.__ebp)
# define ESP_sig(p) ((p)->thread.uts.ts32.__esp)
@@ -187,6 +190,17 @@
# define R13_sig(p) ((p)->thread.__sp)
# define R14_sig(p) ((p)->thread.__lr)
# define R15_sig(p) ((p)->thread.__pc)
#elif defined(__APPLE__)
# define EIP_sig(p) ((p)->uc_mcontext->__ss.__eip)
# define EBP_sig(p) ((p)->uc_mcontext->__ss.__ebp)
# define ESP_sig(p) ((p)->uc_mcontext->__ss.__esp)
# define RIP_sig(p) ((p)->uc_mcontext->__ss.__rip)
# define RBP_sig(p) ((p)->uc_mcontext->__ss.__rbp)
# define RSP_sig(p) ((p)->uc_mcontext->__ss.__rsp)
# define R11_sig(p) ((p)->uc_mcontext->__ss.__r11)
# define R13_sig(p) ((p)->uc_mcontext->__ss.__sp)
# define R14_sig(p) ((p)->uc_mcontext->__ss.__lr)
# define R15_sig(p) ((p)->uc_mcontext->__ss.__pc)
#else
# error "Don't know how to read/write to the thread state via the mcontext_t."
#endif
@@ -271,7 +285,7 @@ enum { REG_EIP = 14 };
# endif // !defined(__BIONIC_HAVE_UCONTEXT_T)
#endif // defined(ANDROID)
#if defined(__APPLE__)
#if defined(USE_APPLE_MACH_PORTS)
# if defined(__x86_64__)
struct macos_x64_context {
x86_thread_state64_t thread;
@@ -405,7 +419,7 @@ HandleTrap(CONTEXT* context)
// a longjmp.
sAlreadyHandlingTrap = false;
#if defined(__APPLE__)
#if defined(USE_APPLE_MACH_PORTS)
// Reroute the PC to run the Unwind function on the main stack after the
// handler exits. This doesn't yet work for stack overflow traps, because
// in that case the main thread doesn't have any space left to run.
@@ -457,7 +471,7 @@ WasmTrapHandler(LPEXCEPTION_POINTERS exception)
return EXCEPTION_CONTINUE_EXECUTION;
}
#elif defined(__APPLE__)
#elif defined(USE_APPLE_MACH_PORTS)
// On OSX we are forced to use the lower-level Mach exception mechanism instead
// of Unix signals because breakpad uses Mach exceptions and would otherwise
// report a crash before wasm gets a chance to handle the exception.
@@ -687,7 +701,7 @@ EnsureEagerSignalHandlers()
return false;
}
#elif defined(__APPLE__)
#elif defined(USE_APPLE_MACH_PORTS)
// All the Mach setup in EnsureLazyProcessSignalHandlers.
#else
// SA_ONSTACK allows us to handle signals on an alternate stack, so that
@@ -751,10 +765,10 @@ EnsureEagerSignalHandlers()
return true;
}
#ifdef __APPLE__
bool
EnsureDarwinMachPorts()
{
#ifdef USE_APPLE_MACH_PORTS
pthread_attr_t handlerThreadAttr;
int r = pthread_attr_init(&handlerThreadAttr);
if (r != 0) {
@@ -803,6 +817,6 @@ EnsureDarwinMachPorts()
return false;
}
#endif
return true;
}
#endif