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QTest::CrashHandler: extract the address of the crashing instruction

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From the user and machine context provided in the signal handler.

Linux w/ GDB prints:
   0x563bb2ab7346 <_ZN11tst_Crashes5crashEv+28>:	movl   $0x1,(%rax)

FreeBSD w/ LLDB prints:
(lldb) x/i 0x0000319a0ae86996
    0x319a0ae86996: c7 40 04 01 00 00 00  other       movl   $0x1, 0x4(%rax)

macOS w/ LLDB prints (after disabling the check for SIP):
(lldb) x/i 0x00000001054086c8
    0x1054086c8: movl   $0x1, 0x4(%rax)

Done-With: Samuel Gaist
Done-With: Ivan Solovev
Change-Id: Iac02025b1922b6b4d927fffd3efe210ef51fc759
Reviewed-by: Ahmad Samir <a.samirh78@gmail.com>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Samuel Gaist <samuel.gaist@idiap.ch>
This commit is contained in:
Thiago Macieira 2025-05-14 19:26:22 -07:00
parent 33435ce567
commit 60f36b8d02
1 changed files with 40 additions and 1 deletions
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41
src/testlib/qtestcrashhandler_unix.cpp
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@ -35,6 +35,13 @@
# if !defined(Q_OS_INTEGRITY)
# include <sys/resource.h>
# endif
# if __has_include(<sys/ucontext.h>)
# include <sys/ucontext.h>
# elif __has_include(<ucontext.h>)
# include <ucontext.h>
# else
using ucontext_t = void;
# endif
#if defined(Q_OS_MACOS)
#include <QtCore/private/qcore_mac_p.h>
@ -361,7 +368,39 @@ void printTestRunTime()
static quintptr getProgramCounter(void *ucontext)
{
quintptr pc = 0;
Q_UNUSED(ucontext);
if ([[maybe_unused]] auto ctx = static_cast<ucontext_t *>(ucontext)) {
#if 0 // keep the list below alphabetical
#elif defined(Q_OS_DARWIN) && defined(Q_PROCESSOR_ARM_64)
pc = ctx->uc_mcontext->__ss.__pc;
#elif defined(Q_OS_DARWIN) && defined(Q_PROCESSOR_X86_64)
pc = ctx->uc_mcontext->__ss.__rip;
#elif defined(Q_OS_FREEBSD) && defined(Q_PROCESSOR_X86_32)
pc = ctx->uc_mcontext.mc_eip;
#elif defined(Q_OS_FREEBSD) && defined(Q_PROCESSOR_X86_64)
pc = ctx->uc_mcontext.mc_rip;
#elif defined(Q_OS_LINUX) && defined(Q_PROCESSOR_ARM_32)
// pc = ctx->uc_mcontext.arm_pc; // untested
#elif defined(Q_OS_LINUX) && defined(Q_PROCESSOR_ARM_64)
pc = ctx->uc_mcontext.pc;
#elif defined(Q_OS_LINUX) && defined(Q_PROCESSOR_MIPS)
// pc = ctx->uc_mcontext.pc; // untested
#elif defined(Q_OS_LINUX) && defined(Q_PROCESSOR_LOONGARCH)
// pc = ctx->uc_mcontext.__pc; // untested
#elif defined(Q_OS_LINUX) && defined(Q_PROCESSOR_POWER_32)
// pc = ctx->uc_mcontext.uc_regs->gregs[PT_NIP]; // untested
#elif defined(Q_OS_LINUX) && defined(Q_PROCESSOR_POWER_64)
// pc = ctx->uc_mcontext.gregs[PT_NIP]; // untested
#elif defined(Q_OS_LINUX) && defined(Q_PROCESSOR_RISCV)
// pc = ctx->uc_mcontext.__gregs[REG_PC]; // untested
#elif defined(Q_OS_LINUX) && defined(Q_PROCESSOR_X86_32)
pc = ctx->uc_mcontext.gregs[REG_EIP];
#elif defined(Q_OS_LINUX) && defined(Q_PROCESSOR_X86_64)
pc = ctx->uc_mcontext.gregs[REG_RIP];
#endif
}
return pc;
}