-/* Low level MIPS interface to ptrace, for GDB when running under Unix.
+/* Low level DECstation interface to ptrace, for GDB when running native.
Copyright 1988, 1989, 1991, 1992 Free Software Foundation, Inc.
#include "defs.h"
#include "inferior.h"
#include "gdbcore.h"
-
-/* For now we stub this out; sgi core format is super-hairy (and completely
- different in the new release).
- For most mips systems, this function is defined in coredep.c. */
-
-#if defined(sgi)
-void
-fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
- char *core_reg_sect;
- unsigned core_reg_size;
- int which;
- unsigned int reg_addr;
-{
- return;
-}
-#endif
-
-/* Access to the inferior is only good for native systems, not cross.
-
-#if defined(sgi) || !defined(GDB_TARGET_IS_MIPS)
-
-/* ARGSUSED */
-void
-fetch_inferior_registers (regno)
- int regno;
-{
- return;
-}
-
-/* ARGSUSED */
-void
-store_inferior_registers (regno)
- int regno;
-{
- return;
-}
-
-
-#else
-
-/* DECstation native... */
-
#include <sys/ptrace.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/user.h>
+#undef JB_S0
+#undef JB_S1
+#undef JB_S2
+#undef JB_S3
+#undef JB_S4
+#undef JB_S5
+#undef JB_S6
+#undef JB_S7
+#undef JB_SP
+#undef JB_S8
+#undef JB_PC
+#undef JB_SR
+#undef NJBREGS
+#include <setjmp.h> /* For JB_XXX. */
+
+/* Size of elements in jmpbuf */
+
+#define JB_ELEMENT_SIZE 4
/* Map gdb internal register number to ptrace ``address''.
These ``addresses'' are defined in DECstation <sys/ptrace.h> */
: regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM) \
: 0)
-static const char zerobuf[MAX_REGISTER_RAW_SIZE];
+static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
/* Get all registers from the inferior */
|| regno == FCRIR_REGNUM || regno == FP_REGNUM
|| (regno >= FIRST_EMBED_REGNUM && regno <= LAST_EMBED_REGNUM))
continue;
- regaddr = register_addr (regno, 1);
+ regaddr = REGISTER_PTRACE_ADDR (regno);
errno = 0;
ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
read_register (regno));
}
}
-#endif /* sgi */
+/* Figure out where the longjmp will land.
+ We expect the first arg to be a pointer to the jmp_buf structure from which
+ we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
+ This routine returns true on success. */
+
+int
+get_longjmp_target(pc)
+ CORE_ADDR *pc;
+{
+ CORE_ADDR jb_addr;
+
+ jb_addr = read_register(A0_REGNUM);
+
+ if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, pc,
+ sizeof(CORE_ADDR)))
+ return 0;
+
+ SWAP_TARGET_AND_HOST(pc, sizeof(CORE_ADDR));
+
+ return 1;
+}
+
+/* Extract the register values out of the core file and store
+ them where `read_register' will find them.
+
+ CORE_REG_SECT points to the register values themselves, read into memory.
+ CORE_REG_SIZE is the size of that area.
+ WHICH says which set of registers we are handling (0 = int, 2 = float
+ on machines where they are discontiguous).
+ REG_ADDR is the offset from u.u_ar0 to the register values relative to
+ core_reg_sect. This is used with old-fashioned core files to
+ locate the registers in a large upage-plus-stack ".reg" section.
+ Original upage address X is at location core_reg_sect+x+reg_addr.
+ */
+
+void
+fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
+ char *core_reg_sect;
+ unsigned core_reg_size;
+ int which;
+ unsigned reg_addr;
+{
+ register int regno;
+ register unsigned int addr;
+ int bad_reg = -1;
+ register reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */
+
+ /* If u.u_ar0 was an absolute address in the core file, relativize it now,
+ so we can use it as an offset into core_reg_sect. When we're done,
+ "register 0" will be at core_reg_sect+reg_ptr, and we can use
+ register_addr to offset to the other registers. If this is a modern
+ core file without a upage, reg_ptr will be zero and this is all a big
+ NOP. */
+ if (reg_ptr > core_reg_size)
+ reg_ptr -= KERNEL_U_ADDR;
+
+ for (regno = 0; regno < NUM_REGS; regno++)
+ {
+ addr = register_addr (regno, reg_ptr);
+ if (addr >= core_reg_size) {
+ if (bad_reg < 0)
+ bad_reg = regno;
+ } else {
+ supply_register (regno, core_reg_sect + addr);
+ }
+ }
+ if (bad_reg >= 0)
+ {
+ error ("Register %s not found in core file.", reg_names[bad_reg]);
+ }
+ supply_register (ZERO_REGNUM, zerobuf);
+ /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
+ supply_register (FP_REGNUM, zerobuf);
+}
+
+/* Return the address in the core dump or inferior of register REGNO.
+ BLOCKEND is the address of the end of the user structure. */
+
+unsigned int
+register_addr (regno, blockend)
+ int regno;
+ int blockend;
+{
+ int addr;
+ if (regno < 0 || regno >= NUM_REGS)
+ error ("Invalid register number %d.", regno);
+
+ REGISTER_U_ADDR (addr, blockend, regno);
+
+ return addr;
+}
projects / binutils.git / blobdiff