iOS: makefiles and runtime for new archs

1 files changed, 70 insertions, 0 deletions

diff --git a/src/rt/arch/armv7/morestack.S b/src/rt/arch/armv7/morestack.S
new file mode 100644
index 00000000000..0b9012cc2a8
--- /dev/null
+++ b/src/rt/arch/armv7/morestack.S
@@ -0,0 +1,70 @@
+// Mark stack as non-executable
+#if defined(__linux__) && defined(__ELF__)
+.section	.note.GNU-stack, "", %progbits
+#endif
+
+/* See i386/morestack.S for the lengthy, general explanation. */
+
+.text
+.code 32
+.arm
+#if defined(__APPLE__)
+.align 2
+#else
+.align
+#endif
+
+#if defined(__APPLE__)
+#define MORESTACK ___morestack
+#define STACK_EXHAUSTED _rust_stack_exhausted
+#else
+#define MORESTACK __morestack
+#define STACK_EXHAUSTED rust_stack_exhausted
+#endif
+
+.global STACK_EXHAUSTED
+.global MORESTACK
+
+// Unfortunately LLVM yet doesn't support emitting correct debug
+// DWARF information for non-ELF targets so to make it compile
+// on iOS all that directives are simply commented out
+#if defined(__APPLE__)
+#define UNWIND @
+#else
+#define UNWIND
+#endif
+
+#if defined(__APPLE__)
+.private_extern MORESTACK
+#else
+.hidden MORESTACK
+#endif
+
+#if !defined(__APPLE__)
+   .type MORESTACK,%function
+#endif
+
+// r4 and r5 are scratch registers for __morestack due to llvm
+// ARMFrameLowering::adjustForSegmentedStacks() implementation.
+MORESTACK:
+    UNWIND .fnstart
+
+    // Save frame pointer and return address
+    UNWIND .save {r4, r5}
+    UNWIND .save {lr}
+    UNWIND .save {r6, fp, lr}
+    push {r6, fp, lr}
+
+    UNWIND .movsp r6
+    mov r6, sp
+    UNWIND .setfp fp, sp, #4
+    add fp, sp, #4
+
+    // Save argument registers of the original function
+    push {r0, r1, r2, r3, lr}
+
+    // Create new stack
+    bl STACK_EXHAUSTED@plt
+
+    // the above function ensures that it never returns
+    UNWIND  .fnend