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path: root/srcpkgs/qt5-webkit/patches/musl-mcontext.patch
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--- Source/JavaScriptCore/heap/MachineStackMarker.cppg	2019-01-12 19:48:12.801137040 +0100
+++ Source/JavaScriptCore/heap/MachineStackMarker.cpp	2019-01-12 20:09:03.662201571 +0100
@@ -681,7 +681,19 @@
 #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
 }
 
@@ -761,7 +773,19 @@
 #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
@@ -850,7 +874,19 @@
 #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)