#include "elf-bfd.h"
#include "elf/frv.h"
#include "frv-tdep.h"
+#include "trad-frame.h"
+#include "frame-unwind.h"
/* Define the size (in bytes) of an FR-V instruction. */
static const int frv_instr_size = 4;
return retval;
}
-/* Given NEXT_FRAME, "callee" frame of the sigtramp frame that we
+/* Given NEXT_FRAME, the "callee" frame of the sigtramp frame that we
wish to decode, and REGNO, one of the frv register numbers defined
in frv-tdep.h, return the address of the saved register (corresponding
to REGNO) in the sigtramp frame. Return -1 if the register is not
found in the sigtramp frame. The magic numbers in the code below
were computed by examining the following kernel structs:
- From arch/frvnommu/signal.c:
+ From arch/frv/kernel/signal.c:
struct sigframe
{
uint32_t retcode[2];
};
- From include/asm-frvnommu/ucontext.h:
+ From include/asm-frv/ucontext.h:
struct ucontext {
unsigned long uc_flags;
sigset_t uc_sigmask;
};
- From include/asm-frvnommu/sigcontext.h:
+ From include/asm-frv/signal.h:
+
+ typedef struct sigaltstack {
+ void *ss_sp;
+ int ss_flags;
+ size_t ss_size;
+ } stack_t;
+
+ From include/asm-frv/sigcontext.h:
struct sigcontext {
struct user_context sc_context;
unsigned long sc_oldmask;
} __attribute__((aligned(8)));
- From include/asm-frvnommu/registers.h:
+ From include/asm-frv/registers.h:
struct user_int_regs
{
unsigned long psr;
void *extension;
} __attribute__((aligned(8))); */
-static CORE_ADDR
+static LONGEST
frv_linux_sigcontext_reg_addr (struct frame_info *next_frame, int regno,
CORE_ADDR *sc_addr_cache_ptr)
{
else if (tramp_type == RT_SIGTRAMP)
{
/* For a realtime sigtramp frame, SP + 12 contains a pointer
- to the a ucontext struct. The ucontext struct contains
- a sigcontext struct starting 12 bytes in. */
+ to a ucontext struct. The ucontext struct contains a
+ sigcontext struct starting 24 bytes in. (The offset of
+ uc_mcontext within struct ucontext is derived as follows:
+ stack_t is a 12-byte struct and struct sigcontext is
+ 8-byte aligned. This gives an offset of 8 + 12 + 4 (for
+ padding) = 24.) */
if (target_read_memory (sp + 12, buf, sizeof buf) != 0)
{
- warning ("Can't read realtime sigtramp frame.");
+ warning (_("Can't read realtime sigtramp frame."));
return 0;
}
sc_addr = extract_unsigned_integer (buf, sizeof buf);
- sc_addr += 12;
+ sc_addr += 24;
}
else
- internal_error (__FILE__, __LINE__, "not a signal trampoline");
+ internal_error (__FILE__, __LINE__, _("not a signal trampoline"));
if (sc_addr_cache_ptr)
*sc_addr_cache_ptr = sc_addr;
}
}
+/* Signal trampolines. */
+
+static struct trad_frame_cache *
+frv_linux_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache)
+{
+ struct trad_frame_cache *cache;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ CORE_ADDR addr;
+ char buf[4];
+ int regnum;
+ CORE_ADDR sc_addr_cache_val = 0;
+ struct frame_id this_id;
+
+ if (*this_cache)
+ return *this_cache;
+
+ cache = trad_frame_cache_zalloc (next_frame);
+
+ /* FIXME: cagney/2004-05-01: This is is long standing broken code.
+ The frame ID's code address should be the start-address of the
+ signal trampoline and not the current PC within that
+ trampoline. */
+ frame_unwind_register (next_frame, sp_regnum, buf);
+ this_id = frame_id_build (extract_unsigned_integer (buf, sizeof buf),
+ frame_pc_unwind (next_frame));
+ trad_frame_set_id (cache, this_id);
+
+ for (regnum = 0; regnum < frv_num_regs; regnum++)
+ {
+ LONGEST reg_addr = frv_linux_sigcontext_reg_addr (next_frame, regnum,
+ &sc_addr_cache_val);
+ if (reg_addr != -1)
+ trad_frame_set_reg_addr (cache, regnum, reg_addr);
+ }
+
+ *this_cache = cache;
+ return cache;
+}
+
+static void
+frv_linux_sigtramp_frame_this_id (struct frame_info *next_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct trad_frame_cache *cache =
+ frv_linux_sigtramp_frame_cache (next_frame, this_cache);
+ trad_frame_get_id (cache, this_id);
+}
+
+static void
+frv_linux_sigtramp_frame_prev_register (struct frame_info *next_frame,
+ void **this_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, void *valuep)
+{
+ /* Make sure we've initialized the cache. */
+ struct trad_frame_cache *cache =
+ frv_linux_sigtramp_frame_cache (next_frame, this_cache);
+ trad_frame_get_register (cache, next_frame, regnum, optimizedp, lvalp,
+ addrp, realnump, valuep);
+}
+
+static const struct frame_unwind frv_linux_sigtramp_frame_unwind =
+{
+ SIGTRAMP_FRAME,
+ frv_linux_sigtramp_frame_this_id,
+ frv_linux_sigtramp_frame_prev_register
+};
+
+static const struct frame_unwind *
+frv_linux_sigtramp_frame_sniffer (struct frame_info *next_frame)
+{
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
+ char *name;
+
+ find_pc_partial_function (pc, &name, NULL, NULL);
+ if (frv_linux_pc_in_sigtramp (pc, name))
+ return &frv_linux_sigtramp_frame_unwind;
+
+ return NULL;
+}
+
static void
frv_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
- /* When the FR-V Linux kernel calls a signal handler, the return
- address points to a bit of code on the stack. This function is
- used to identify this bit of code as a signal trampoline in order
- to support backtracing through calls to signal handlers. */
- set_gdbarch_deprecated_pc_in_sigtramp (gdbarch, frv_linux_pc_in_sigtramp);
- frv_set_sigcontext_reg_addr (gdbarch, frv_linux_sigcontext_reg_addr);
+ /* Set the sigtramp frame sniffer. */
+ frame_unwind_append_sniffer (gdbarch, frv_linux_sigtramp_frame_sniffer);
}
static enum gdb_osabi
projects / deliverable / binutils-gdb.git / blobdiff