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diff --git a/Source/JavaScriptCore/heap/MachineStackMarker.cpp b/Source/JavaScriptCore/heap/MachineStackMarker.cpp
index 883914fd3d1..9c0209ad2f3 100644
--- a/Source/JavaScriptCore/heap/MachineStackMarker.cpp
+++ b/Source/JavaScriptCore/heap/MachineStackMarker.cpp
@@ -683,7 +683,19 @@ void* MachineThreads::Thread::Registers::framePointer() const
#endif
#else
-#error Need a way to get the frame pointer for another thread on this platform
+
+// The following sequence depends on musl libc's sys/ucontext.h.
+#if CPU(X86)
+ return reinterpret_cast<void*>((uintptr_t) regs.machineContext.gregs[REG_EBP]);
+#elif CPU(X86_64)
+ return reinterpret_cast<void*>((uintptr_t) regs.machineContext.gregs[REG_RBP]);
+#elif CPU(ARM)
+ return reinterpret_cast<void*>((uintptr_t) regs.machineContext.arm_fp);
+#elif CPU(ARM64)
+ return reinterpret_cast<void*>((uintptr_t) regs.machineContext.regs[29]);
+#elif CPU(MIPS)
+ return reinterpret_cast<void*>((uintptr_t) regs.machineContext.gregs[30]);
+#endif
#endif
}
@@ -765,7 +777,19 @@ void* MachineThreads::Thread::Registers::instructionPointer() const
#endif
#else
-#error Need a way to get the instruction pointer for another thread on this platform
+
+// The following sequence depends on musl libc's sys/ucontext.h.
+#if CPU(X86)
+ return reinterpret_cast<void*>((uintptr_t) regs.machineContext.gregs[REG_EIP]);
+#elif CPU(X86_64)
+ return reinterpret_cast<void*>((uintptr_t) regs.machineContext.gregs[REG_RIP]);
+#elif CPU(ARM)
+ return reinterpret_cast<void*>((uintptr_t) regs.machineContext.arm_pc);
+#elif CPU(ARM64)
+ return reinterpret_cast<void*>((uintptr_t) regs.machineContext.pc);
+#elif CPU(MIPS)
+ return reinterpret_cast<void *>((uintptr_t)regs.machineContext.pc);
+#endif
#endif
}
void* MachineThreads::Thread::Registers::llintPC() const
@@ -856,7 +880,19 @@ void* MachineThreads::Thread::Registers::llintPC() const
#endif
#else
-#error Need a way to get the LLIntPC for another thread on this platform
+
+// The following sequence depends on musl libc's sys/ucontext.h.
+#if CPU(X86)
+ return reinterpret_cast<void*>((uintptr_t) regs.machineContext.gregs[REG_ESI]);
+#elif CPU(X86_64)
+ return reinterpret_cast<void*>((uintptr_t) regs.machineContext.gregs[REG_R8]);
+#elif CPU(ARM)
+ return reinterpret_cast<void*>((uintptr_t) regs.machineContext.arm_r8);
+#elif CPU(ARM64)
+ return reinterpret_cast<void*>((uintptr_t) regs.machineContext.regs[4]);
+#elif CPU(MIPS)
+ return reinterpret_cast<void*>((uintptr_t) regs.machineContext.gregs[12]);
+#endif
#endif
}
#endif // ENABLE(SAMPLING_PROFILER)
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