Add initial ARM and MIPS support. To support this, also enable the

reading of .debug_frame sections (used in lieu of .eh_frame sections
when they're not available).

1 files changed, 298 insertions, 0 deletions

diff --git a/include/libunwind-arm.h b/include/libunwind-arm.h
new file mode 100644
index 00000000..492331e4
--- /dev/null
+++ b/include/libunwind-arm.h
@@ -0,0 +1,298 @@
+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2008 CodeSourcery
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+
+#ifndef LIBUNWIND_H
+#define LIBUNWIND_H
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+#include <inttypes.h>
+#include <ucontext.h>
+
+#define UNW_TARGET	arm
+#define UNW_TARGET_ARM	1
+
+#define _U_TDEP_QP_TRUE	0	/* see libunwind-dynamic.h  */
+
+/* This needs to be big enough to accommodate "struct cursor", while
+   leaving some slack for future expansion.  Changing this value will
+   require recompiling all users of this library.  Stack allocation is
+   relatively cheap and unwind-state copying is relatively rare, so we
+   want to err on making it rather too big than too small.  */
+   
+/* FIXME for ARM. Too big?  What do other things use for similar tasks?  */
+#define UNW_TDEP_CURSOR_LEN	4096
+
+typedef uint32_t unw_word_t;
+typedef int32_t unw_sword_t;
+
+typedef long double unw_tdep_fpreg_t;
+
+typedef enum
+  {
+    UNW_ARM_R0,
+    UNW_ARM_R1,
+    UNW_ARM_R2,
+    UNW_ARM_R3,
+    UNW_ARM_R4,
+    UNW_ARM_R5,
+    UNW_ARM_R6,
+    UNW_ARM_R7,
+    UNW_ARM_R8,
+    UNW_ARM_R9,
+    UNW_ARM_R10,
+    UNW_ARM_R11,
+    UNW_ARM_R12,
+    UNW_ARM_R13,
+    UNW_ARM_R14,
+    UNW_ARM_R15,
+    
+    /* VFPv2 s0-s31 (obsolescent numberings).  */
+    UNW_ARM_S0 = 64,
+    UNW_ARM_S1,
+    UNW_ARM_S2,
+    UNW_ARM_S3,
+    UNW_ARM_S4,
+    UNW_ARM_S5,
+    UNW_ARM_S6,
+    UNW_ARM_S7,
+    UNW_ARM_S8,
+    UNW_ARM_S9,
+    UNW_ARM_S10,
+    UNW_ARM_S11,
+    UNW_ARM_S12,
+    UNW_ARM_S13,
+    UNW_ARM_S14,
+    UNW_ARM_S15,
+    UNW_ARM_S16,
+    UNW_ARM_S17,
+    UNW_ARM_S18,
+    UNW_ARM_S19,
+    UNW_ARM_S20,
+    UNW_ARM_S21,
+    UNW_ARM_S22,
+    UNW_ARM_S23,
+    UNW_ARM_S24,
+    UNW_ARM_S25,
+    UNW_ARM_S26,
+    UNW_ARM_S27,
+    UNW_ARM_S28,
+    UNW_ARM_S29,
+    UNW_ARM_S30,
+    UNW_ARM_S31,
+    
+    /* FPA register numberings.  */
+    UNW_ARM_F0 = 96,
+    UNW_ARM_F1,
+    UNW_ARM_F2,
+    UNW_ARM_F3,
+    UNW_ARM_F4,
+    UNW_ARM_F5,
+    UNW_ARM_F6,
+    UNW_ARM_F7,
+    
+    /* iWMMXt GR register numberings.  */
+    UNW_ARM_wCGR0 = 104,
+    UNW_ARM_wCGR1,
+    UNW_ARM_wCGR2,
+    UNW_ARM_wCGR3,
+    UNW_ARM_wCGR4,
+    UNW_ARM_wCGR5,
+    UNW_ARM_wCGR6,
+    UNW_ARM_wCGR7,
+    
+    /* iWMMXt register numberings.  */
+    UNW_ARM_wR0 = 112,
+    UNW_ARM_wR1,
+    UNW_ARM_wR2,
+    UNW_ARM_wR3,
+    UNW_ARM_wR4,
+    UNW_ARM_wR5,
+    UNW_ARM_wR6,
+    UNW_ARM_wR7,
+    UNW_ARM_wR8,
+    UNW_ARM_wR9,
+    UNW_ARM_wR10,
+    UNW_ARM_wR11,
+    UNW_ARM_wR12,
+    UNW_ARM_wR13,
+    UNW_ARM_wR14,
+    UNW_ARM_wR15,
+    
+    /* Two-byte encodings from here on.  */
+    
+    /* SPSR.  */
+    UNW_ARM_SPSR = 128,
+    UNW_ARM_SPSR_FIQ,
+    UNW_ARM_SPSR_IRQ,
+    UNW_ARM_SPSR_ABT,
+    UNW_ARM_SPSR_UND,
+    UNW_ARM_SPSR_SVC,
+    
+    /* User mode registers.  */
+    UNW_ARM_R8_USR = 144,
+    UNW_ARM_R9_USR,
+    UNW_ARM_R10_USR,
+    UNW_ARM_R11_USR,
+    UNW_ARM_R12_USR,
+    UNW_ARM_R13_USR,
+    UNW_ARM_R14_USR,
+    
+    /* FIQ registers.  */
+    UNW_ARM_R8_FIQ = 151,
+    UNW_ARM_R9_FIQ,
+    UNW_ARM_R10_FIQ,
+    UNW_ARM_R11_FIQ,
+    UNW_ARM_R12_FIQ,
+    UNW_ARM_R13_FIQ,
+    UNW_ARM_R14_FIQ,
+    
+    /* IRQ registers.  */
+    UNW_ARM_R13_IRQ = 158,
+    UNW_ARM_R14_IRQ,
+    
+    /* ABT registers.  */
+    UNW_ARM_R13_ABT = 160,
+    UNW_ARM_R14_ABT,
+    
+    /* UND registers.  */
+    UNW_ARM_R13_UND = 162,
+    UNW_ARM_R14_UND,
+    
+    /* SVC registers.  */
+    UNW_ARM_R13_SVC = 164,
+    UNW_ARM_R14_SVC,
+    
+    /* iWMMXt control registers.  */
+    UNW_ARM_wC0 = 192,
+    UNW_ARM_wC1,
+    UNW_ARM_wC2,
+    UNW_ARM_wC3,
+    UNW_ARM_wC4,
+    UNW_ARM_wC5,
+    UNW_ARM_wC6,
+    UNW_ARM_wC7,
+
+    /* VFPv3/Neon 64-bit registers.  */
+    UNW_ARM_D0 = 256,
+    UNW_ARM_D1,
+    UNW_ARM_D2,
+    UNW_ARM_D3,
+    UNW_ARM_D4,
+    UNW_ARM_D5,
+    UNW_ARM_D6,
+    UNW_ARM_D7,
+    UNW_ARM_D8,
+    UNW_ARM_D9,
+    UNW_ARM_D10,
+    UNW_ARM_D11,
+    UNW_ARM_D12,
+    UNW_ARM_D13,
+    UNW_ARM_D14,
+    UNW_ARM_D15,
+    UNW_ARM_D16,
+    UNW_ARM_D17,
+    UNW_ARM_D18,
+    UNW_ARM_D19,
+    UNW_ARM_D20,
+    UNW_ARM_D21,
+    UNW_ARM_D22,
+    UNW_ARM_D23,
+    UNW_ARM_D24,
+    UNW_ARM_D25,
+    UNW_ARM_D26,
+    UNW_ARM_D27,
+    UNW_ARM_D28,
+    UNW_ARM_D29,
+    UNW_ARM_D30,
+    UNW_ARM_D31,
+
+    /* For ARM, the CFA is the value of SP (r13) at the call site in the
+       previous frame.  */
+    UNW_ARM_CFA,
+
+    UNW_TDEP_LAST_REG = UNW_ARM_D31,
+
+    UNW_TDEP_IP = UNW_ARM_R14,  /* A little white lie.  */
+    UNW_TDEP_SP = UNW_ARM_R13,
+    UNW_TDEP_EH = UNW_ARM_R0   /* FIXME.  */
+  }
+arm_regnum_t;
+
+#define UNW_TDEP_NUM_EH_REGS	2	/* FIXME for ARM.  */
+
+typedef struct unw_tdep_save_loc
+  {
+    /* Additional target-dependent info on a save location.  */
+  }
+unw_tdep_save_loc_t;
+
+/* On ARM, we can directly use ucontext_t as the unwind context.  */
+typedef ucontext_t unw_tdep_context_t;
+
+/* There is no getcontext() on ARM.  Use a stub version which only saves GP
+   registers.  FIXME: Not ideal, may not be sufficient for all libunwind
+   use cases.  Stores pc+8, which is only approximately correct, really.  */
+#ifndef __thumb__
+#define unw_tdep_getcontext(uc) (({					\
+  unw_tdep_context_t *unw_ctx = (uc);					\
+  register int unw_base asm ("r0")					\
+    = (int) (&unw_ctx->uc_mcontext.arm_r0);				\
+  __asm__ __volatile__ (						\
+    "stmia %[base], {r0-r15}"						\
+    : : [base] "r" (unw_base) : "memory");				\
+  }), 0)
+#else /* __thumb__ */
+#define unw_tdep_getcontext(uc) (({					\
+  unw_tdep_context_t *unw_ctx = (uc);					\
+  register int unw_base asm ("r0")					\
+    = (int) (&unw_ctx->uc_mcontext.arm_r0);				\
+  __asm__ __volatile__ (						\
+    ".align 2\nbx pc\nnop\n.code 32\n"					\
+    "stmia %[base], {r0-r15}\n"						\
+    "orr %[base], pc, #1\nbx %[base]"					\
+    : [base] "+r" (unw_base) : : "memory", "cc");			\
+  }), 0)
+#endif
+
+#include "libunwind-dynamic.h"
+
+typedef struct
+  {
+    /* no arm-specific auxiliary proc-info */
+  }
+unw_tdep_proc_info_t;
+
+#include "libunwind-common.h"
+
+#define unw_tdep_is_fpreg		UNW_ARCH_OBJ(is_fpreg)
+extern int unw_tdep_is_fpreg (int);
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}
+#endif
+
+#endif /* LIBUNWIND_H */