[src/trunk]: src/sys/lib/libunwind Add support for non-EABI (DWARF) ARM excep...

[matt <matt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a1a452f3cf88
branches:  trunk
changeset: 793175:a1a452f3cf88
user:      matt <matt%NetBSD.org@localhost>
date:      Wed Jan 29 06:59:53 2014 +0000

description:
Add support for non-EABI (DWARF) ARM exception handling.

diffstat:

 sys/lib/libunwind/Registers.hpp      |  72 ++++++++++++++++++++++++++++++++++++
 sys/lib/libunwind/libunwind.cxx      |   2 +
 sys/lib/libunwind/unwind_registers.S |  20 ++++++++++
 3 files changed, 94 insertions(+), 0 deletions(-)

diffs (121 lines):

diff -r 78cecb7805db -r a1a452f3cf88 sys/lib/libunwind/Registers.hpp
--- a/sys/lib/libunwind/Registers.hpp   Wed Jan 29 05:27:35 2014 +0000
+++ b/sys/lib/libunwind/Registers.hpp   Wed Jan 29 06:59:53 2014 +0000
@@ -229,6 +229,78 @@
   vecreg_t vecreg[64];
 };
 
+enum {
+  DWARF_ARM32_R0 = 0,
+  DWARF_ARM32_R15 = 15,
+  DWARF_ARM32_SPSR = 128,
+  DWARF_ARM32_D0 = 256,                // VFP-v3/Neon
+  DWARF_ARM32_D31 = 287,
+  REGNO_ARM32_R0 = 0,
+  REGNO_ARM32_SP = 13,
+  REGNO_ARM32_R15 = 15,
+  REGNO_ARM32_SPSR = 16,
+  REGNO_ARM32_D0 = 0,
+  REGNO_ARM32_D31 = 31,
+};
+
+class Registers_arm32 {
+public:
+  enum {
+    LAST_RESTORE_REG = REGNO_ARM32_SPSR,
+    IP_PSEUDO_REG = REGNO_ARM32_SPSR,
+    LAST_REGISTER = REGNO_ARM32_D31,
+  };
+
+  __dso_hidden Registers_arm32();
+
+  static int dwarf2regno(int num) {
+    if (num >= DWARF_ARM32_R0 && num <= DWARF_ARM32_R15)
+      return REGNO_ARM32_R0 + (num - DWARF_ARM32_R0);
+    if (num >= DWARF_ARM32_D0 && num <= DWARF_ARM32_D31)
+      return REGNO_ARM32_D0 + (num - DWARF_ARM32_D0);
+    if (num == DWARF_ARM32_SPSR)
+      return REGNO_ARM32_SPSR;
+    return LAST_REGISTER + 1;
+  }
+
+  bool validRegister(int num) const {
+    return num >= 0 && num <= LAST_RESTORE_REG;
+  }
+
+  uint64_t getRegister(int num) const {
+    assert(validRegister(num));
+    return reg[num];
+  }
+
+  void setRegister(int num, uint64_t value) {
+    assert(validRegister(num));
+    reg[num] = value;
+  }
+
+  uint64_t getIP() const { return reg[REGNO_ARM32_R15]; }
+
+  void setIP(uint64_t value) { reg[REGNO_ARM32_R15] = value; }
+
+  uint64_t getSP() const { return reg[REGNO_ARM32_SP]; }
+
+  void setSP(uint64_t value) { reg[REGNO_ARM32_SP] = value; }
+
+  bool validFloatVectorRegister(int num) const {
+    return (num >= REGNO_ARM32_D0 && num <= REGNO_ARM32_D31);
+  }
+
+  void copyFloatVectorRegister(int num, uint64_t addr_) {
+    const void *addr = reinterpret_cast<const void *>(addr_);
+    memcpy(fpreg + (num - REGNO_ARM32_D0), addr, sizeof(fpreg[0]));
+  }
+
+  __dso_hidden void jumpto() const __dead;
+
+private:
+  uint32_t reg[REGNO_ARM32_SPSR + 1];
+  uint64_t fpreg[32];
+};
+
 } // namespace _Unwind
 
 #endif // __REGISTERS_HPP__
diff -r 78cecb7805db -r a1a452f3cf88 sys/lib/libunwind/libunwind.cxx
--- a/sys/lib/libunwind/libunwind.cxx   Wed Jan 29 05:27:35 2014 +0000
+++ b/sys/lib/libunwind/libunwind.cxx   Wed Jan 29 06:59:53 2014 +0000
@@ -23,6 +23,8 @@
 typedef Registers_x86_64 ThisUnwindRegisters;
 #elif __powerpc__
 typedef Registers_ppc32 ThisUnwindRegisters;
+#elif __arm__ && !defined(__ARM_EABI__)
+typedef Registers_arm32 ThisUnwindRegisters;
 #else
 #error Unsupported architecture
 #endif
diff -r 78cecb7805db -r a1a452f3cf88 sys/lib/libunwind/unwind_registers.S
--- a/sys/lib/libunwind/unwind_registers.S      Wed Jan 29 05:27:35 2014 +0000
+++ b/sys/lib/libunwind/unwind_registers.S      Wed Jan 29 06:59:53 2014 +0000
@@ -210,3 +210,23 @@
        lwz             %r3,12(%r3)   /* do r3 last */
        bctr
 #endif
+
+#if defined(__arm__) && !defined(__ARM_EABI__)
+       .hidden _ZN7_Unwind15Registers_arm32C1Ev
+ENTRY(_ZN7_Unwind15Registers_arm32C1Ev)
+       stmia   r0, {r0-r14}
+
+       str     lr, [r0, #60]   /* PC */
+       mrs     r1, cpsr
+       str     r1, [r0, #64]   /* CPSR */
+
+       RET
+END(_ZN7_Unwind15Registers_arm32C1Ev)
+
+       .hidden _ZNK7_Unwind15Registers_arm326jumptoEv
+ENTRY(_ZNK7_Unwind15Registers_arm326jumptoEv)
+       ldr     r1, [r0, #64]
+       msr     cpsr_sxc, r1
+       ldmia   r0, {r0-r15}
+END(_ZNK7_Unwind15Registers_arm326jumptoEv)
+#endif