From: Michael Snyder Date: Sat, 10 Aug 2002 00:34:04 +0000 (+0000) Subject: 2002-08-09 Michael Snyder X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=cb3d25d11f6af715fc361ab4f8e3631be3f6a110;p=binutils-gdb.git 2002-08-09 Michael Snyder * mips-tdep.c (ROUND_DOWN, ROUND_UP): Move to global scope. (mips_push_arguments): Correct some comments. Use paddr_nz for printing addresses in debug output. Replace static allocation using MAX_REGISTER_RAW_SIZE with alloca. (mips_n32n64_push_arguments): New function, cloned from mips_push_arguments and tuned for the n32/n64 ABI. (mips_push_register): Buffer needs dynamic allocation. (mips_print_register): Ditto. (do_gp_register_row): Ditto. (mips_store_return_value): Ditto. (mips_gdbarch_init): Set gdbarch_push_arguments per ABI. --- diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 42d2bb06ded..af49ea70877 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,17 @@ +2002-08-09 Michael Snyder + + * mips-tdep.c (ROUND_DOWN, ROUND_UP): Move to global scope. + (mips_push_arguments): Correct some comments. Use paddr_nz + for printing addresses in debug output. Replace static + allocation using MAX_REGISTER_RAW_SIZE with alloca. + (mips_n32n64_push_arguments): New function, cloned from + mips_push_arguments and tuned for the n32/n64 ABI. + (mips_push_register): Buffer needs dynamic allocation. + (mips_print_register): Ditto. + (do_gp_register_row): Ditto. + (mips_store_return_value): Ditto. + (mips_gdbarch_init): Set gdbarch_push_arguments per ABI. + 2002-08-09 Don Howard * memattr.c (mem_info_command): Print special case of upper bound diff --git a/gdb/mips-tdep.c b/gdb/mips-tdep.c index 1faf071ab5c..c57a03b2609 100644 --- a/gdb/mips-tdep.c +++ b/gdb/mips-tdep.c @@ -2443,6 +2443,12 @@ mips_type_needs_double_align (struct type *type) return 0; } +/* Macros to round N up or down to the next A boundary; + A must be a power of two. */ + +#define ROUND_DOWN(n,a) ((n) & ~((a)-1)) +#define ROUND_UP(n,a) (((n)+(a)-1) & ~((a)-1)) + CORE_ADDR mips_push_arguments (int nargs, struct value **args, @@ -2457,16 +2463,12 @@ mips_push_arguments (int nargs, int stack_offset = 0; struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); - /* Macros to round N up or down to the next A boundary; A must be - a power of two. */ -#define ROUND_DOWN(n,a) ((n) & ~((a)-1)) -#define ROUND_UP(n,a) (((n)+(a)-1) & ~((a)-1)) - /* First ensure that the stack and structure return address (if any) - are properly aligned. The stack has to be at least 64-bit aligned - even on 32-bit machines, because doubles must be 64-bit aligned. - On at least one MIPS variant, stack frames need to be 128-bit - aligned, so we round to this widest known alignment. */ + are properly aligned. The stack has to be at least 64-bit + aligned even on 32-bit machines, because doubles must be 64-bit + aligned. For n32 and n64, stack frames need to be 128-bit + aligned, so we round to this widest known alignment. */ + sp = ROUND_DOWN (sp, 16); struct_addr = ROUND_DOWN (struct_addr, 16); @@ -2478,8 +2480,8 @@ mips_push_arguments (int nargs, sp -= ROUND_UP (len, 16); if (mips_debug) - fprintf_unfiltered (gdb_stdlog, "mips_push_arguments: sp=0x%lx allocated %d\n", - (long) sp, ROUND_UP (len, 16)); + fprintf_unfiltered (gdb_stdlog, "mips_push_arguments: sp=0x%s allocated %d\n", + paddr_nz (sp), ROUND_UP (len, 16)); /* Initialize the integer and float register pointers. */ argreg = A0_REGNUM; @@ -2490,8 +2492,8 @@ mips_push_arguments (int nargs, { if (mips_debug) fprintf_unfiltered (gdb_stdlog, - "mips_push_arguments: struct_return reg=%d 0x%lx\n", - argreg, (long) struct_addr); + "mips_push_arguments: struct_return reg=%d 0x%s\n", + argreg, paddr_nz (struct_addr)); write_register (argreg++, struct_addr); if (MIPS_REGS_HAVE_HOME_P) stack_offset += MIPS_STACK_ARGSIZE; @@ -2503,7 +2505,7 @@ mips_push_arguments (int nargs, for (argnum = 0; argnum < nargs; argnum++) { char *val; - char valbuf[MAX_REGISTER_RAW_SIZE]; + char *valbuf = alloca (MAX_REGISTER_RAW_SIZE); struct value *arg = args[argnum]; struct type *arg_type = check_typedef (VALUE_TYPE (arg)); int len = TYPE_LENGTH (arg_type); @@ -2675,10 +2677,10 @@ mips_push_arguments (int nargs, if (mips_debug) { - fprintf_unfiltered (gdb_stdlog, " - stack_offset=0x%lx", - (long) stack_offset); - fprintf_unfiltered (gdb_stdlog, " longword_offset=0x%lx", - (long) longword_offset); + fprintf_unfiltered (gdb_stdlog, " - stack_offset=0x%s", + paddr_nz (stack_offset)); + fprintf_unfiltered (gdb_stdlog, " longword_offset=0x%s", + paddr_nz (longword_offset)); } addr = sp + stack_offset + longword_offset; @@ -2686,10 +2688,12 @@ mips_push_arguments (int nargs, if (mips_debug) { int i; - fprintf_unfiltered (gdb_stdlog, " @0x%lx ", (long) addr); + fprintf_unfiltered (gdb_stdlog, " @0x%s ", + paddr_nz (addr)); for (i = 0; i < partial_len; i++) { - fprintf_unfiltered (gdb_stdlog, "%02x", val[i] & 0xff); + fprintf_unfiltered (gdb_stdlog, "%02x", + val[i] & 0xff); } } write_memory (addr, val, partial_len); @@ -2779,6 +2783,230 @@ mips_push_arguments (int nargs, return sp; } +CORE_ADDR +mips_n32n64_push_arguments (int nargs, + struct value **args, + CORE_ADDR sp, + int struct_return, + CORE_ADDR struct_addr) +{ + int argreg; + int float_argreg; + int argnum; + int len = 0; + int stack_offset = 0; + + /* First ensure that the stack and structure return address (if any) + are properly aligned. The stack has to be at least 64-bit + aligned even on 32-bit machines, because doubles must be 64-bit + aligned. For n32 and n64, stack frames need to be 128-bit + aligned, so we round to this widest known alignment. */ + + sp = ROUND_DOWN (sp, 16); + struct_addr = ROUND_DOWN (struct_addr, 16); + + /* Now make space on the stack for the args. */ + for (argnum = 0; argnum < nargs; argnum++) + len += ROUND_UP (TYPE_LENGTH (VALUE_TYPE (args[argnum])), + MIPS_STACK_ARGSIZE); + sp -= ROUND_UP (len, 16); + + if (mips_debug) + fprintf_unfiltered (gdb_stdlog, + "mips_n32n64_push_arguments: sp=0x%s allocated %d\n", + paddr_nz (sp), ROUND_UP (len, 16)); + + /* Initialize the integer and float register pointers. */ + argreg = A0_REGNUM; + float_argreg = FPA0_REGNUM; + + /* the struct_return pointer occupies the first parameter-passing reg */ + if (struct_return) + { + if (mips_debug) + fprintf_unfiltered (gdb_stdlog, + "mips_n32n64_push_arguments: struct_return reg=%d 0x%s\n", + argreg, paddr_nz (struct_addr)); + write_register (argreg++, struct_addr); + } + + /* Now load as many as possible of the first arguments into + registers, and push the rest onto the stack. Loop thru args + from first to last. */ + for (argnum = 0; argnum < nargs; argnum++) + { + char *val; + char *valbuf = alloca (MAX_REGISTER_RAW_SIZE); + struct value *arg = args[argnum]; + struct type *arg_type = check_typedef (VALUE_TYPE (arg)); + int len = TYPE_LENGTH (arg_type); + enum type_code typecode = TYPE_CODE (arg_type); + + if (mips_debug) + fprintf_unfiltered (gdb_stdlog, + "mips_n32n64_push_arguments: %d len=%d type=%d", + argnum + 1, len, (int) typecode); + + val = (char *) VALUE_CONTENTS (arg); + + if (fp_register_arg_p (typecode, arg_type) + && float_argreg <= MIPS_LAST_FP_ARG_REGNUM) + { + /* This is a floating point value that fits entirely + in a single register. */ + /* On 32 bit ABI's the float_argreg is further adjusted + above to ensure that it is even register aligned. */ + LONGEST regval = extract_unsigned_integer (val, len); + if (mips_debug) + fprintf_unfiltered (gdb_stdlog, " - fpreg=%d val=%s", + float_argreg, phex (regval, len)); + write_register (float_argreg++, regval); + + if (mips_debug) + fprintf_unfiltered (gdb_stdlog, " - reg=%d val=%s", + argreg, phex (regval, len)); + write_register (argreg, regval); + argreg += 1; + } + else + { + /* Copy the argument to general registers or the stack in + register-sized pieces. Large arguments are split between + registers and stack. */ + /* Note: structs whose size is not a multiple of MIPS_REGSIZE + are treated specially: Irix cc passes them in registers + where gcc sometimes puts them on the stack. For maximum + compatibility, we will put them in both places. */ + int odd_sized_struct = ((len > MIPS_SAVED_REGSIZE) && + (len % MIPS_SAVED_REGSIZE != 0)); + /* Note: Floating-point values that didn't fit into an FP + register are only written to memory. */ + while (len > 0) + { + /* Rememer if the argument was written to the stack. */ + int stack_used_p = 0; + int partial_len = len < MIPS_SAVED_REGSIZE ? + len : MIPS_SAVED_REGSIZE; + + if (mips_debug) + fprintf_unfiltered (gdb_stdlog, " -- partial=%d", + partial_len); + + /* Write this portion of the argument to the stack. */ + if (argreg > MIPS_LAST_ARG_REGNUM + || odd_sized_struct + || fp_register_arg_p (typecode, arg_type)) + { + /* Should shorter than int integer values be + promoted to int before being stored? */ + int longword_offset = 0; + CORE_ADDR addr; + stack_used_p = 1; + if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) + { + if (MIPS_STACK_ARGSIZE == 8 && + (typecode == TYPE_CODE_INT || + typecode == TYPE_CODE_PTR || + typecode == TYPE_CODE_FLT) && len <= 4) + longword_offset = MIPS_STACK_ARGSIZE - len; + else if ((typecode == TYPE_CODE_STRUCT || + typecode == TYPE_CODE_UNION) && + TYPE_LENGTH (arg_type) < MIPS_STACK_ARGSIZE) + longword_offset = MIPS_STACK_ARGSIZE - len; + } + + if (mips_debug) + { + fprintf_unfiltered (gdb_stdlog, " - stack_offset=0x%s", + paddr_nz (stack_offset)); + fprintf_unfiltered (gdb_stdlog, " longword_offset=0x%s", + paddr_nz (longword_offset)); + } + + addr = sp + stack_offset + longword_offset; + + if (mips_debug) + { + int i; + fprintf_unfiltered (gdb_stdlog, " @0x%s ", + paddr_nz (addr)); + for (i = 0; i < partial_len; i++) + { + fprintf_unfiltered (gdb_stdlog, "%02x", + val[i] & 0xff); + } + } + write_memory (addr, val, partial_len); + } + + /* Note!!! This is NOT an else clause. Odd sized + structs may go thru BOTH paths. Floating point + arguments will not. */ + /* Write this portion of the argument to a general + purpose register. */ + if (argreg <= MIPS_LAST_ARG_REGNUM + && !fp_register_arg_p (typecode, arg_type)) + { + LONGEST regval = extract_unsigned_integer (val, partial_len); + + /* A non-floating-point argument being passed in a + general register. If a struct or union, and if + the remaining length is smaller than the register + size, we have to adjust the register value on + big endian targets. + + It does not seem to be necessary to do the + same for integral types. + + cagney/2001-07-23: gdb/179: Also, GCC, when + outputting LE O32 with sizeof (struct) < + MIPS_SAVED_REGSIZE, generates a left shift as + part of storing the argument in a register a + register (the left shift isn't generated when + sizeof (struct) >= MIPS_SAVED_REGSIZE). Since it + is quite possible that this is GCC contradicting + the LE/O32 ABI, GDB has not been adjusted to + accommodate this. Either someone needs to + demonstrate that the LE/O32 ABI specifies such a + left shift OR this new ABI gets identified as + such and GDB gets tweaked accordingly. */ + + if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG + && partial_len < MIPS_SAVED_REGSIZE + && (typecode == TYPE_CODE_STRUCT || + typecode == TYPE_CODE_UNION)) + regval <<= ((MIPS_SAVED_REGSIZE - partial_len) * + TARGET_CHAR_BIT); + + if (mips_debug) + fprintf_filtered (gdb_stdlog, " - reg=%d val=%s", + argreg, + phex (regval, MIPS_SAVED_REGSIZE)); + write_register (argreg, regval); + argreg++; + } + + len -= partial_len; + val += partial_len; + + /* Compute the the offset into the stack at which we + will copy the next parameter. + + In N32 (N64?), the stack_offset only needs to be + adjusted when it has been used. */ + + if (stack_used_p) + stack_offset += ROUND_UP (partial_len, MIPS_STACK_ARGSIZE); + } + } + if (mips_debug) + fprintf_unfiltered (gdb_stdlog, "\n"); + } + + /* Return adjusted stack pointer. */ + return sp; +} + CORE_ADDR mips_push_return_address (CORE_ADDR pc, CORE_ADDR sp) { @@ -2791,7 +3019,7 @@ mips_push_return_address (CORE_ADDR pc, CORE_ADDR sp) static void mips_push_register (CORE_ADDR * sp, int regno) { - char buffer[MAX_REGISTER_RAW_SIZE]; + char *buffer = alloca (MAX_REGISTER_RAW_SIZE); int regsize; int offset; if (MIPS_SAVED_REGSIZE < REGISTER_RAW_SIZE (regno)) @@ -3070,7 +3298,7 @@ mips_read_fp_register_double (int regno, char *rare_buffer) static void mips_print_register (int regnum, int all) { - char raw_buffer[MAX_REGISTER_RAW_SIZE]; + char *raw_buffer (MAX_REGISTER_RAW_SIZE); /* Get the data in raw format. */ if (!frame_register_read (selected_frame, regnum, raw_buffer)) @@ -3087,7 +3315,7 @@ mips_print_register (int regnum, int all) || mips2_fp_compat ()) && !((regnum - FP0_REGNUM) & 1)) { - char dbuffer[2 * MAX_REGISTER_RAW_SIZE]; + char *dbuffer = alloca (2 * MAX_REGISTER_RAW_SIZE); mips_read_fp_register_double (regnum, dbuffer); @@ -3222,7 +3450,7 @@ static int do_gp_register_row (int regnum) { /* do values for GP (int) regs */ - char raw_buffer[MAX_REGISTER_RAW_SIZE]; + char *raw_buffer = alloca (MAX_REGISTER_RAW_SIZE); int ncols = (MIPS_REGSIZE == 8 ? 4 : 8); /* display cols per row */ int col, byte; int start_regnum = regnum; @@ -3715,7 +3943,7 @@ mips_extract_return_value (struct type *valtype, void mips_store_return_value (struct type *valtype, char *valbuf) { - char raw_buffer[MAX_REGISTER_RAW_SIZE]; + char *raw_buffer = alloca (MAX_REGISTER_RAW_SIZE); struct return_value_word lo; struct return_value_word hi; return_value_location (valtype, &hi, &lo); @@ -4547,6 +4775,7 @@ mips_gdbarch_init (struct gdbarch_info info, switch (mips_abi) { case MIPS_ABI_O32: + set_gdbarch_push_arguments (gdbarch, mips_push_arguments); tdep->mips_default_saved_regsize = 4; tdep->mips_default_stack_argsize = 4; tdep->mips_fp_register_double = 0; @@ -4564,6 +4793,7 @@ mips_gdbarch_init (struct gdbarch_info info, mips_o32_use_struct_convention); break; case MIPS_ABI_O64: + set_gdbarch_push_arguments (gdbarch, mips_push_arguments); tdep->mips_default_saved_regsize = 8; tdep->mips_default_stack_argsize = 8; tdep->mips_fp_register_double = 1; @@ -4581,6 +4811,7 @@ mips_gdbarch_init (struct gdbarch_info info, mips_o32_use_struct_convention); break; case MIPS_ABI_EABI32: + set_gdbarch_push_arguments (gdbarch, mips_push_arguments); tdep->mips_default_saved_regsize = 4; tdep->mips_default_stack_argsize = 4; tdep->mips_fp_register_double = 0; @@ -4598,6 +4829,7 @@ mips_gdbarch_init (struct gdbarch_info info, mips_eabi_use_struct_convention); break; case MIPS_ABI_EABI64: + set_gdbarch_push_arguments (gdbarch, mips_push_arguments); tdep->mips_default_saved_regsize = 8; tdep->mips_default_stack_argsize = 8; tdep->mips_fp_register_double = 1; @@ -4615,6 +4847,7 @@ mips_gdbarch_init (struct gdbarch_info info, mips_eabi_use_struct_convention); break; case MIPS_ABI_N32: + set_gdbarch_push_arguments (gdbarch, mips_n32n64_push_arguments); tdep->mips_default_saved_regsize = 8; tdep->mips_default_stack_argsize = 8; tdep->mips_fp_register_double = 1; @@ -4644,6 +4877,7 @@ mips_gdbarch_init (struct gdbarch_info info, mips_n32n64_reg_struct_has_addr); break; case MIPS_ABI_N64: + set_gdbarch_push_arguments (gdbarch, mips_n32n64_push_arguments); tdep->mips_default_saved_regsize = 8; tdep->mips_default_stack_argsize = 8; tdep->mips_fp_register_double = 1; @@ -4763,7 +4997,6 @@ mips_gdbarch_init (struct gdbarch_info info, set_gdbarch_call_dummy_words (gdbarch, mips_call_dummy_words); set_gdbarch_sizeof_call_dummy_words (gdbarch, sizeof (mips_call_dummy_words)); set_gdbarch_push_return_address (gdbarch, mips_push_return_address); - set_gdbarch_push_arguments (gdbarch, mips_push_arguments); set_gdbarch_register_convertible (gdbarch, generic_register_convertible_not); set_gdbarch_coerce_float_to_double (gdbarch, mips_coerce_float_to_double);