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Diffstat (limited to 'gdb/sparc64-tdep.c')
| -rw-r--r-- | gdb/sparc64-tdep.c | 1491 |
1 files changed, 1491 insertions, 0 deletions
diff --git a/gdb/sparc64-tdep.c b/gdb/sparc64-tdep.c new file mode 100644 index 0000000..da5d357 --- /dev/null +++ b/gdb/sparc64-tdep.c @@ -0,0 +1,1491 @@ +/* Target-dependent code for UltraSPARC. + + Copyright 2003 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include "defs.h" +#include "arch-utils.h" +#include "floatformat.h" +#include "frame.h" +#include "frame-base.h" +#include "frame-unwind.h" +#include "gdbcore.h" +#include "gdbtypes.h" +#include "osabi.h" +#include "regcache.h" +#include "target.h" +#include "value.h" + +#include "gdb_assert.h" +#include "gdb_string.h" + +#include "sparc64-tdep.h" + +/* This file implements the The SPARC 64-bit ABI as defined by the + section "Low-Level System Information" of the SPARC Compliance + Definition (SCD) 2.4.1, which is the 64-bit System V psABI for + SPARC. */ + +/* Please use the sparc32_-prefix for 32-bit specific code, the + sparc64_-prefix for 64-bit specific code and the sparc_-prefix for + code can handle both. */ + +/* The stack pointer is offset from the stack frame by a BIAS of 2047 + (0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC + hosts, so undefine it first. */ +#undef BIAS +#define BIAS 2047 + +/* Macros to extract fields from SPARC instructions. */ +#define X_OP(i) (((i) >> 30) & 0x3) +#define X_A(i) (((i) >> 29) & 1) +#define X_COND(i) (((i) >> 25) & 0xf) +#define X_OP2(i) (((i) >> 22) & 0x7) +#define X_IMM22(i) ((i) & 0x3fffff) +#define X_OP3(i) (((i) >> 19) & 0x3f) +/* Sign extension macros. */ +#define X_DISP22(i) ((X_IMM22 (i) ^ 0x200000) - 0x200000) +#define X_DISP19(i) ((((i) & 0x7ffff) ^ 0x40000) - 0x40000) + +/* Fetch the instruction at PC. Instructions are always big-endian + even if the processor operates in little-endian mode. */ + +static unsigned long +sparc_fetch_instruction (CORE_ADDR pc) +{ + unsigned char buf[4]; + unsigned long insn; + int i; + + read_memory (pc, buf, sizeof (buf)); + + insn = 0; + for (i = 0; i < sizeof (buf); i++) + insn = (insn << 8) | buf[i]; + return insn; +} + +/* The functions on this page are intended to be used to classify + function arguments. */ + +/* Return the contents if register REGNUM as an address. */ + +static CORE_ADDR +sparc_address_from_register (int regnum) +{ + ULONGEST addr; + + regcache_cooked_read_unsigned (current_regcache, regnum, &addr); + return addr; +} + +/* Check whether TYPE is "Integral or Pointer". */ + +static int +sparc64_integral_or_pointer_p (const struct type *type) +{ + switch (TYPE_CODE (type)) + { + case TYPE_CODE_INT: + case TYPE_CODE_BOOL: + case TYPE_CODE_CHAR: + case TYPE_CODE_ENUM: + case TYPE_CODE_RANGE: + { + int len = TYPE_LENGTH (type); + gdb_assert (len == 1 || len == 2 || len == 4 || len == 8); + } + return 1; + case TYPE_CODE_PTR: + case TYPE_CODE_REF: + { + int len = TYPE_LENGTH (type); + gdb_assert (len == 8); + } + return 1; + default: + break; + } + + return 0; +} + +/* Check whether TYPE is "Floating". */ + +static int +sparc64_floating_p (const struct type *type) +{ + switch (TYPE_CODE (type)) + { + case TYPE_CODE_FLT: + { + int len = TYPE_LENGTH (type); + gdb_assert (len == 4 || len == 8 || len == 16); + } + return 1; + default: + break; + } + + return 0; +} + +/* Check whether TYPE is "Structure or Union". */ + +static int +sparc64_structure_or_union_p (const struct type *type) +{ + switch (TYPE_CODE (type)) + { + case TYPE_CODE_STRUCT: + case TYPE_CODE_UNION: + return 1; + default: + break; + } + + return 0; +} + +/* UltraSPARC architecture specific information. */ + +struct gdbarch_tdep +{ + /* Offset of saved PC in jmp_buf. */ + int jb_pc_offset; +}; + +/* Register information. */ + +struct sparc64_register_info +{ + char *name; + struct type **type; +}; + +static struct sparc64_register_info sparc64_register_info[] = +{ + { "g0", &builtin_type_int64 }, + { "g1", &builtin_type_int64 }, + { "g2", &builtin_type_int64 }, + { "g3", &builtin_type_int64 }, + { "g4", &builtin_type_int64 }, + { "g5", &builtin_type_int64 }, + { "g6", &builtin_type_int64 }, + { "g7", &builtin_type_int64 }, + + { "o0", &builtin_type_int64 }, + { "o1", &builtin_type_int64 }, + { "o2", &builtin_type_int64 }, + { "o3", &builtin_type_int64 }, + { "o4", &builtin_type_int64 }, + { "o5", &builtin_type_int64 }, + { "sp", &builtin_type_void_data_ptr }, + { "o7", &builtin_type_int64 }, + + { "l0", &builtin_type_int64 }, + { "l1", &builtin_type_int64 }, + { "l2", &builtin_type_int64 }, + { "l3", &builtin_type_int64 }, + { "l4", &builtin_type_int64 }, + { "l5", &builtin_type_int64 }, + { "l6", &builtin_type_int64 }, + { "l7", &builtin_type_int64 }, + + { "i0", &builtin_type_int64 }, + { "i1", &builtin_type_int64 }, + { "i2", &builtin_type_int64 }, + { "i3", &builtin_type_int64 }, + { "i4", &builtin_type_int64 }, + { "i5", &builtin_type_int64 }, + { "fp", &builtin_type_void_data_ptr }, + { "i7", &builtin_type_int64 }, + + { "f0", &builtin_type_float }, + { "f1", &builtin_type_float }, + { "f2", &builtin_type_float }, + { "f3", &builtin_type_float }, + { "f4", &builtin_type_float }, + { "f5", &builtin_type_float }, + { "f6", &builtin_type_float }, + { "f7", &builtin_type_float }, + { "f8", &builtin_type_float }, + { "f9", &builtin_type_float }, + { "f10", &builtin_type_float }, + { "f11", &builtin_type_float }, + { "f12", &builtin_type_float }, + { "f13", &builtin_type_float }, + { "f14", &builtin_type_float }, + { "f15", &builtin_type_float }, + { "f16", &builtin_type_float }, + { "f17", &builtin_type_float }, + { "f18", &builtin_type_float }, + { "f19", &builtin_type_float }, + { "f20", &builtin_type_float }, + { "f21", &builtin_type_float }, + { "f22", &builtin_type_float }, + { "f23", &builtin_type_float }, + { "f24", &builtin_type_float }, + { "f25", &builtin_type_float }, + { "f26", &builtin_type_float }, + { "f27", &builtin_type_float }, + { "f28", &builtin_type_float }, + { "f29", &builtin_type_float }, + { "f30", &builtin_type_float }, + { "f31", &builtin_type_float }, + { "f32", &builtin_type_double }, + { "f34", &builtin_type_double }, + { "f36", &builtin_type_double }, + { "f38", &builtin_type_double }, + { "f40", &builtin_type_double }, + { "f42", &builtin_type_double }, + { "f44", &builtin_type_double }, + { "f46", &builtin_type_double }, + { "f48", &builtin_type_double }, + { "f50", &builtin_type_double }, + { "f52", &builtin_type_double }, + { "f54", &builtin_type_double }, + { "f56", &builtin_type_double }, + { "f58", &builtin_type_double }, + { "f60", &builtin_type_double }, + { "f62", &builtin_type_double }, + + { "pc", &builtin_type_void_func_ptr }, + { "npc", &builtin_type_void_func_ptr }, + + /* This raw register contains the contents of %cwp, %pstate, %asi + and %ccr as laid out in a %tstate register. */ + { NULL, &builtin_type_int64 }, + + { "fsr", &builtin_type_int64 }, + { "fprs", &builtin_type_int64 }, + + /* "Although Y is a 64-bit register, its high-order 32 bits are + reserved and always read as 0." */ + { "y", &builtin_type_int64 } +}; + +/* Total number of registers. */ +#define SPARC64_NUM_REGS \ + (sizeof (sparc64_register_info) / sizeof (sparc64_register_info[0])) + +/* We provide the aliases %d0..%d62 and %q0..%q60 for the floating + registers as "psuedo" registers. */ + +static struct sparc64_register_info sparc64_pseudo_register_info[] = +{ + { "cwp", &builtin_type_int64 }, + { "pstate", &builtin_type_int64 }, + { "asi", &builtin_type_int64 }, + { "ccr", &builtin_type_int64 }, + + { "d0", &builtin_type_double }, + { "d2", &builtin_type_double }, + { "d4", &builtin_type_double }, + { "d6", &builtin_type_double }, + { "d8", &builtin_type_double }, + { "d10", &builtin_type_double }, + { "d12", &builtin_type_double }, + { "d14", &builtin_type_double }, + { "d16", &builtin_type_double }, + { "d18", &builtin_type_double }, + { "d20", &builtin_type_double }, + { "d22", &builtin_type_double }, + { "d24", &builtin_type_double }, + { "d26", &builtin_type_double }, + { "d28", &builtin_type_double }, + { "d30", &builtin_type_double }, + { "d32", &builtin_type_double }, + { "d34", &builtin_type_double }, + { "d36", &builtin_type_double }, + { "d38", &builtin_type_double }, + { "d40", &builtin_type_double }, + { "d42", &builtin_type_double }, + { "d44", &builtin_type_double }, + { "d46", &builtin_type_double }, + { "d48", &builtin_type_double }, + { "d50", &builtin_type_double }, + { "d52", &builtin_type_double }, + { "d54", &builtin_type_double }, + { "d56", &builtin_type_double }, + { "d58", &builtin_type_double }, + { "d60", &builtin_type_double }, + { "d62", &builtin_type_double }, + + { "q0", &builtin_type_long_double }, + { "q4", &builtin_type_long_double }, + { "q8", &builtin_type_long_double }, + { "q12", &builtin_type_long_double }, + { "q16", &builtin_type_long_double }, + { "q20", &builtin_type_long_double }, + { "q24", &builtin_type_long_double }, + { "q28", &builtin_type_long_double }, + { "q32", &builtin_type_long_double }, + { "q36", &builtin_type_long_double }, + { "q40", &builtin_type_long_double }, + { "q44", &builtin_type_long_double }, + { "q48", &builtin_type_long_double }, + { "q52", &builtin_type_long_double }, + { "q56", &builtin_type_long_double }, + { "q60", &builtin_type_long_double } +}; + +/* Total number of pseudo registers. */ +#define SPARC64_NUM_PSEUDO_REGS \ + (sizeof (sparc64_pseudo_register_info) \ + / sizeof (sparc64_pseudo_register_info[0])) + +/* Return the name of register REGNUM. */ + +static const char * +sparc64_register_name (int regnum) +{ + if (regnum >= 0 && regnum < SPARC64_NUM_REGS) + return sparc64_register_info[regnum].name; + + if (regnum >= SPARC64_NUM_REGS + && regnum < SPARC64_NUM_REGS + SPARC64_NUM_PSEUDO_REGS) + return sparc64_pseudo_register_info[regnum - SPARC64_NUM_REGS].name; + + return NULL; +} + +/* Return the GDB type object for the "standard" data type of data in + register REGNUM. */ + +static struct type * +sparc64_register_type (struct gdbarch *gdbarch, int regnum) +{ + if (regnum >= SPARC64_NUM_REGS + && regnum < SPARC64_NUM_REGS + SPARC64_NUM_PSEUDO_REGS) + return *sparc64_pseudo_register_info[regnum - SPARC64_NUM_REGS].type; + + gdb_assert (regnum >= 0 && regnum < SPARC64_NUM_REGS); + return *sparc64_register_info[regnum].type; +} + +static void +sparc64_pseudo_register_read (struct gdbarch *gdbarch, + struct regcache *regcache, + int regnum, void *buf) +{ + gdb_assert (regnum >= SPARC64_NUM_REGS); + + if (regnum >= SPARC64_D0_REGNUM && regnum <= SPARC64_D30_REGNUM) + { + regnum = SPARC_F0_REGNUM + 2 * (regnum - SPARC64_D0_REGNUM); + regcache_raw_read (regcache, regnum, buf); + regcache_raw_read (regcache, regnum + 1, ((char *)buf) + 4); + } + else if (regnum >= SPARC64_D32_REGNUM && regnum <= SPARC64_D62_REGNUM) + { + regnum = SPARC64_F32_REGNUM + (regnum - SPARC64_D32_REGNUM); + regcache_raw_read (regcache, regnum, buf); + } + else if (regnum >= SPARC64_Q0_REGNUM && regnum <= SPARC64_Q28_REGNUM) + { + regnum = SPARC_F0_REGNUM + 4 * (regnum - SPARC64_Q0_REGNUM); + regcache_raw_read (regcache, regnum, buf); + regcache_raw_read (regcache, regnum + 1, ((char *)buf) + 4); + regcache_raw_read (regcache, regnum + 2, ((char *)buf) + 8); + regcache_raw_read (regcache, regnum + 3, ((char *)buf) + 12); + } + else if (regnum >= SPARC64_Q32_REGNUM && regnum <= SPARC64_Q60_REGNUM) + { + regnum = SPARC64_F32_REGNUM + 2 * (regnum - SPARC64_Q32_REGNUM); + regcache_raw_read (regcache, regnum, buf); + regcache_raw_read (regcache, regnum + 1, ((char *)buf) + 8); + } + else if (regnum == SPARC64_CWP_REGNUM + || regnum == SPARC64_PSTATE_REGNUM + || regnum == SPARC64_ASI_REGNUM + || regnum == SPARC64_CCR_REGNUM) + { + ULONGEST state; + + regcache_raw_read_unsigned (regcache, SPARC64_STATE_REGNUM, &state); + switch (regnum) + { + SPARC64_CWP_REGNUM: + state = (state >> 0) & ((1 << 5) - 1); + break; + SPARC64_PSTATE_REGNUM: + state = (state >> 8) & ((1 << 12) - 1); + break; + SPARC64_ASI_REGNUM: + state = (state >> 24) & ((1 << 8) - 1); + break; + SPARC64_CCR_REGNUM: + state = (state >> 32) & ((1 << 8) - 1); + break; + } + store_unsigned_integer (buf, 8, state); + } +} + +static void +sparc64_pseudo_register_write (struct gdbarch *gdbarch, + struct regcache *regcache, + int regnum, const void *buf) +{ + gdb_assert (regnum >= SPARC64_NUM_REGS); + + if (regnum >= SPARC64_D0_REGNUM && regnum <= SPARC64_D30_REGNUM) + { + regnum = SPARC_F0_REGNUM + 2 * (regnum - SPARC64_D0_REGNUM); + regcache_raw_write (regcache, regnum, buf); + regcache_raw_write (regcache, regnum + 1, ((const char *)buf) + 4); + } + else if (regnum >= SPARC64_D32_REGNUM && regnum <= SPARC64_D62_REGNUM) + { + regnum = SPARC64_F32_REGNUM + (regnum - SPARC64_D32_REGNUM); + regcache_raw_write (regcache, regnum, buf); + } + else if (regnum >= SPARC64_Q0_REGNUM && regnum <= SPARC64_Q28_REGNUM) + { + regnum = SPARC_F0_REGNUM + 4 * (regnum - SPARC64_Q0_REGNUM); + regcache_raw_write (regcache, regnum, buf); + regcache_raw_write (regcache, regnum + 1, ((const char *)buf) + 4); + regcache_raw_write (regcache, regnum + 2, ((const char *)buf) + 8); + regcache_raw_write (regcache, regnum + 3, ((const char *)buf) + 12); + } + else if (regnum >= SPARC64_Q32_REGNUM && regnum <= SPARC64_Q60_REGNUM) + { + regnum = SPARC64_F32_REGNUM + 2 * (regnum - SPARC64_Q32_REGNUM); + regcache_raw_write (regcache, regnum, buf); + regcache_raw_write (regcache, regnum + 1, ((const char *)buf) + 8); + } +} + +/* Use the program counter to determine the contents and size of a + breakpoint instruction. Return a pointer to a string of bytes that + encode a breakpoint instruction, store the length of the string in + *LEN and optionally adjust *PC to point to the correct memory + location for inserting the breakpoint. */ + +static const unsigned char * +sparc_breakpoint_from_pc (CORE_ADDR *pc, int *len) +{ + static unsigned char break_insn[] = { 0x91, 0xd0, 0x20, 0x01 }; + + *len = sizeof (break_insn); + return break_insn; +} + + +struct sparc64_frame_cache +{ + /* Base address. */ + CORE_ADDR base; + CORE_ADDR pc; + + /* Do we have a frame? */ + int frameless_p; +}; + +/* Allocate and initialize a frame cache. */ + +static struct sparc64_frame_cache * +sparc64_alloc_frame_cache (void) +{ + struct sparc64_frame_cache *cache; + int i; + + cache = FRAME_OBSTACK_ZALLOC (struct sparc64_frame_cache); + + /* Base address. */ + cache->base = 0; + cache->pc = 0; + + /* Frameless until proven otherwise. */ + cache->frameless_p = 1; + + return cache; +} + +static CORE_ADDR +sparc64_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, + struct sparc64_frame_cache *cache) +{ + unsigned long insn; + + if (current_pc <= pc) + return current_pc; + + /* Check whether the function starts with a SAVE instruction. */ + insn = sparc_fetch_instruction (pc); + if (X_OP (insn) == 2 && X_OP3 (insn) == 0x3c) + { + cache->frameless_p = 0; + return pc + 4; + } + + return pc; +} + +static CORE_ADDR +sparc64_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) +{ + return frame_unwind_register_unsigned (next_frame, SPARC64_PC_REGNUM); +} + +/* Return PC of first real instruction of the function starting at + START_PC. */ + +static CORE_ADDR +sparc64_skip_prologue (CORE_ADDR start_pc) +{ + struct symtab_and_line sal; + CORE_ADDR func_start, func_end; + struct sparc64_frame_cache cache; + + /* This is the preferred method, find the end of the prologue by + using the debugging information. */ + if (find_pc_partial_function (start_pc, NULL, &func_start, &func_end)) + { + sal = find_pc_line (func_start, 0); + + if (sal.end < func_end + && start_pc <= sal.end) + return sal.end; + } + + return sparc64_analyze_prologue (start_pc, 0xffffffffffffffffUL, &cache); +} + +/* Normal frames. */ + +static struct sparc64_frame_cache * +sparc64_frame_cache (struct frame_info *next_frame, void **this_cache) +{ + struct sparc64_frame_cache *cache; + + if (*this_cache) + return *this_cache; + + cache = sparc64_alloc_frame_cache (); + *this_cache = cache; + + /* In priciple, for normal frames, %fp (%i6) holds the frame + pointer, which holds the base address for the current stack + frame. */ + + cache->base = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM); + if (cache->base == 0) + return cache; + + cache->pc = frame_func_unwind (next_frame); + if (cache->pc != 0) + sparc64_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); + + if (cache->frameless_p) + { + /* We didn't find a valid frame, which means that CACHE->base + currently holds the frame pointer for our calling frame. */ + cache->base = frame_unwind_register_unsigned (next_frame, + SPARC_SP_REGNUM); + } + + return cache; +} + +static void +sparc64_frame_this_id (struct frame_info *next_frame, void **this_cache, + struct frame_id *this_id) +{ + struct sparc64_frame_cache *cache = + sparc64_frame_cache (next_frame, this_cache); + + /* This marks the outermost frame. */ + if (cache->base == 0) + return; + + (*this_id) = frame_id_build (cache->base, cache->pc); +} + +static void +sparc64_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) +{ + struct sparc64_frame_cache *cache = + sparc64_frame_cache (next_frame, this_cache); + + if (regnum == SPARC64_PC_REGNUM || regnum == SPARC64_NPC_REGNUM) + { + *optimizedp = 0; + *lvalp = not_lval; + *addrp = 0; + *realnump = -1; + if (valuep) + { + CORE_ADDR pc = (regnum == SPARC64_NPC_REGNUM) ? 4 : 0; + + regnum = cache->frameless_p ? SPARC_O7_REGNUM : SPARC_I7_REGNUM; + pc += frame_unwind_register_unsigned (next_frame, regnum) + 8; + store_unsigned_integer (valuep, 8, pc); + } + return; + } + + /* The previous frame's `local' and `in' registers have been saved + in the register save area. */ + if (!cache->frameless_p + && regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM) + { + *optimizedp = 0; + *lvalp = lval_memory; + *addrp = cache->base + BIAS + (regnum - SPARC_L0_REGNUM) * 8; + *realnump = -1; + if (valuep) + { + struct gdbarch *gdbarch = get_frame_arch (next_frame); + + /* Read the value in from memory. */ + read_memory (*addrp, valuep, register_size (gdbarch, regnum)); + } + return; + } + + /* The previous frame's `out' registers are accessable as the + current frame's `in' registers. */ + if (!cache->frameless_p + && regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM) + regnum += (SPARC_I0_REGNUM - SPARC_O0_REGNUM); + + frame_register_unwind (next_frame, regnum, + optimizedp, lvalp, addrp, realnump, valuep); +} + +static const struct frame_unwind sparc64_frame_unwind = +{ + NORMAL_FRAME, + sparc64_frame_this_id, + sparc64_frame_prev_register +}; + +static const struct frame_unwind * +sparc64_frame_sniffer (struct frame_info *next_frame) +{ + return &sparc64_frame_unwind; +} + + +static CORE_ADDR +sparc64_frame_base_address (struct frame_info *next_frame, void **this_cache) +{ + struct sparc64_frame_cache *cache = + sparc64_frame_cache (next_frame, this_cache); + + /* ??? Should we take BIAS into account here? */ + return cache->base; +} + +static const struct frame_base sparc64_frame_base = +{ + &sparc64_frame_unwind, + sparc64_frame_base_address, + sparc64_frame_base_address, + sparc64_frame_base_address +}; + +static struct frame_id +sparc_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) +{ + CORE_ADDR sp; + + sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM); + return frame_id_build (sp, frame_pc_unwind (next_frame)); +} + +/* Check whether TYPE must be 16-byte aligned. */ + +static int +sparc64_16_byte_align_p (struct type *type) +{ + if (sparc64_floating_p (type) && TYPE_LENGTH (type) == 16) + return 1; + + if (sparc64_structure_or_union_p (type)) + { + int i; + + for (i = 0; i < TYPE_NFIELDS (type); i++) + if (sparc64_16_byte_align_p (TYPE_FIELD_TYPE (type, i))) + return 1; + } + + return 0; +} + +/* Store floating fields of element ELEMENT of an "parameter array" + that has type TYPE and is stored at BITPOS in VALBUF in the + apropriate registers of REGCACHE. This function can be called + recursively and therefore handles floating types in addition to + structures. */ + +static void +sparc64_store_floating_fields (struct regcache *regcache, struct type *type, + char *valbuf, int element, int bitpos) +{ + gdb_assert (element < 16); + + if (sparc64_floating_p (type)) + { + int len = TYPE_LENGTH (type); + int regnum; + + if (len == 16) + { + gdb_assert (bitpos == 0); + gdb_assert ((element % 2) == 0); + + regnum = SPARC64_Q0_REGNUM + element / 2; + regcache_cooked_write (regcache, regnum, valbuf); + } + else if (len == 8) + { + gdb_assert (bitpos == 0 || bitpos == 64); + + regnum = SPARC64_D0_REGNUM + element + bitpos / 64; + regcache_cooked_write (regcache, regnum, valbuf + (bitpos / 8)); + } + else + { + gdb_assert (len == 4); + gdb_assert (bitpos % 32 == 0 && bitpos >= 0 && bitpos < 128); + + regnum = SPARC_F0_REGNUM + element * 2 + bitpos / 32; + regcache_cooked_write (regcache, regnum, valbuf + (bitpos / 8)); + } + } + else if (sparc64_structure_or_union_p (type)) + { + int i; + + for (i = 0; i < TYPE_NFIELDS (type); i++) + sparc64_store_floating_fields (regcache, TYPE_FIELD_TYPE (type, i), + valbuf, element, + bitpos + TYPE_FIELD_BITPOS (type, i)); + } +} + +/* Fetch floating fields from a variable of type TYPE from the + appropriate registers for BITPOS in REGCACHE and store it at BITPOS + in VALBUF. This function can be called recursively and therefore + handles floating types in addition to structures. */ + +static void +sparc64_extract_floating_fields (struct regcache *regcache, struct type *type, + char *valbuf, int bitpos) +{ + if (sparc64_floating_p (type)) + { + int len = TYPE_LENGTH (type); + int regnum; + + if (len == 16) + { + gdb_assert (bitpos == 0 || bitpos == 128); + + regnum = SPARC64_Q0_REGNUM + bitpos / 128; + regcache_cooked_read (regcache, regnum, valbuf + (bitpos / 8)); + } + else if (len == 8) + { + gdb_assert (bitpos % 64 == 0 && bitpos >= 0 && bitpos < 256); + + regnum = SPARC64_D0_REGNUM + bitpos / 64; + regcache_cooked_read (regcache, regnum, valbuf + (bitpos / 8)); + } + else + { + gdb_assert (len == 4); + gdb_assert (bitpos % 32 == 0 && bitpos >= 0 && bitpos < 256); + + regnum = SPARC_F0_REGNUM + bitpos / 32; + regcache_cooked_read (regcache, regnum, valbuf + (bitpos / 8)); + } + } + else if (sparc64_structure_or_union_p (type)) + { + int i; + + for (i = 0; i < TYPE_NFIELDS (type); i++) + sparc64_extract_floating_fields (regcache, TYPE_FIELD_TYPE (type, i), + valbuf, + bitpos + TYPE_FIELD_BITPOS (type, i)); + } +} + +/* Store the NARGS arguments ARGS and STRUCT_ADDR (if STRUCT_RETURN is + non-zero) in REGCACHE and on the stack (starting from address SP). */ + +static CORE_ADDR +sparc64_store_arguments (struct regcache *regcache, int nargs, + struct value **args, CORE_ADDR sp, + int struct_return, CORE_ADDR struct_addr) +{ + /* Number of extended words in the "parameter array". */ + int num_elements = 0; + int element = 0; + int i; + + /* Take BIAS into account. */ + sp += BIAS; + + /* First we calculate the number of extended words in the "parameter + array". While doing so we also convert some of the arguments. */ + + if (struct_return) + num_elements++; + + for (i = 0; i < nargs; i++) + { + struct type *type = VALUE_TYPE (args[i]); + int len = TYPE_LENGTH (type); + + if (sparc64_structure_or_union_p (type)) + { + /* Structure or Union arguments. */ + if (len <= 16) + { + if (num_elements % 2 && sparc64_16_byte_align_p (type)) + num_elements++; + num_elements += ((len + 7) / 8); + } + else + { + /* The psABI says that "Structures or unions larger than + sixteen bytes are copied by the caller and passed + indirectly; the caller will pass the address of a + correctly aligned structure value. This sixty-four + bit address will occupy one word in the parameter + array, and may be promoted to an %o register like any + other pointer value." Allocate memory for these + values on the stack. */ + sp -= len; + + /* Use 16-byte alignment for these values. That's + always correct, and wasting a few bytes shouldn't be + a problem. */ + sp &= ~0xf; + + write_memory (sp, VALUE_CONTENTS (args[i]), len); + args[i] = value_from_pointer (lookup_pointer_type (type), sp); + num_elements++; + } + } + else if (sparc64_floating_p (type)) + { + /* Floating arguments. */ + + if (len == 16) + { + /* The psABI says that "Each quad-precision parameter + value will be assigned to two extended words in the + parameter array. */ + num_elements += 2; + + /* The psABI says that "Long doubles must be + quad-aligned, and thus a hole might be introduced + into the parameter array to force alignment." Skip + an element if necessary. */ + if (num_elements % 2) + num_elements++; + } + else + num_elements++; + } + else + { + /* Integral and pointer arguments. */ + gdb_assert (sparc64_integral_or_pointer_p (type)); + + /* The psABI says that "Each argument value of integral type + smaller than an extended word will be widened by the + caller to an extended word according to the signed-ness + of the argument type." */ + if (len < 8) + args[i] = value_cast (builtin_type_int64, args[i]); + num_elements++; + } + } + + /* Allocate the "parameter array". */ + sp -= num_elements * 8; + + /* The psABI says that "Every stack frame must be 16-byte aligned." */ + sp &= ~0xf; + + /* Now we store the arguments in to the "paramater array". Some + Integer or Pointer arguments and Structure or Union arguments + will be passed in %o registers. Some Floating arguments and + floating members of structures are passed in floating-point + registers. However, for functions with variable arguments, + floating arguments are stored in an %0 register, and for + functions without a prototype floating arguments are stored in + both a floating-point and an %o registers, or a floating-point + register and memory. To simplify the logic here we always pass + arguments in memory, an %o register, and a floating-point + register if appropriate. This should be no problem since the + contents of any unused memory or registers in the "parameter + array" are undefined. */ + + if (struct_return) + { + regcache_cooked_write_unsigned (regcache, SPARC_O0_REGNUM, struct_addr); + element++; + } + + for (i = 0; i < nargs; i++) + { + char *valbuf = VALUE_CONTENTS (args[i]); + struct type *type = VALUE_TYPE (args[i]); + int len = TYPE_LENGTH (type); + int regnum = -1; + char buf[16]; + + if (sparc64_structure_or_union_p (type)) + { + /* Structure or Union arguments. */ + gdb_assert (len <= 16); + memset (buf, 0, sizeof (buf)); + valbuf = memcpy (buf, valbuf, len); + + if (element % 2 && sparc64_16_byte_align_p (type)) + element++; + + if (element < 6) + { + regnum = SPARC_O0_REGNUM + element; + if (len > 8 && element < 5) + regcache_cooked_write (regcache, regnum + 1, valbuf + 8); + } + + if (element < 16) + sparc64_store_floating_fields (regcache, type, valbuf, element, 0); + } + else if (sparc64_floating_p (type)) + { + /* Floating arguments. */ + if (len == 16) + { + if (element % 2) + element++; + if (element < 16) + regnum = SPARC64_Q0_REGNUM + element / 2; + } + else if (len == 8) + { + if (element < 16) + regnum = SPARC64_D0_REGNUM + element; + } + else + { + /* The psABI says "Each single-precision parameter value + will be assigned to one extended word in the + parameter array, and right-justified within that + word; the left half (even floatregister) is + undefined." Even though the psABI says that "the + left half is undefined", set it to zero here. */ + memset (buf, 0, 4); + valbuf = memcpy (buf + 4, valbuf, 4); + len = 8; + if (element < 16) + regnum = SPARC64_D0_REGNUM; + } + } + else + { + /* Integral and pointer arguments. */ + gdb_assert (len == 8); + if (element < 6) + regnum = SPARC_O0_REGNUM + element; + } + + if (regnum != -1) + { + regcache_cooked_write (regcache, regnum, valbuf); + + /* If we're storing the value in a floating-point register, + also store it in the corresponding %0 register(s). */ + if (regnum >= SPARC64_D0_REGNUM && regnum <= SPARC64_D10_REGNUM) + { + gdb_assert (element < 6); + regnum = SPARC_O0_REGNUM + element; + regcache_cooked_write (regcache, regnum, valbuf); + } + else if (regnum >= SPARC64_Q0_REGNUM && regnum <= SPARC64_Q8_REGNUM) + { + gdb_assert (element < 6); + regnum = SPARC_O0_REGNUM + element; + regcache_cooked_write (regcache, regnum, valbuf); + regcache_cooked_write (regcache, regnum + 1, valbuf); + } + } + + /* Always store the argument in memeory. */ + write_memory (sp + element * 8, valbuf, len); + element += ((len + 7) / 8); + } + + gdb_assert (element == num_elements); + + /* Take BIAS into account. */ + sp -= BIAS; + return sp; +} + +static CORE_ADDR +sparc64_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr, + struct regcache *regcache, CORE_ADDR bp_addr, + int nargs, struct value **args, CORE_ADDR sp, + int struct_return, CORE_ADDR struct_addr) +{ + /* Set return address. */ + regcache_cooked_write_unsigned (regcache, SPARC_O7_REGNUM, bp_addr - 8); + + /* Set up function arguments. */ + sp = sparc64_store_arguments (regcache, nargs, args, sp, + struct_return, struct_addr); + + /* Allocate the register save area. */ + sp -= 16 * 8; + + /* Stack should be 16-byte aligned at this point. */ + gdb_assert (sp % 16 == 0); + + /* Finally, update the stack pointer. */ + regcache_cooked_write_unsigned (regcache, SPARC_SP_REGNUM, sp); + + return sp; +} + + +/* Extract from an array REGBUF containing the (raw) register state, a + function return value of TYPE, and copy that into VALBUF. */ + +static void +sparc64_extract_return_value (struct type *type, struct regcache *regcache, + void *valbuf) +{ + int len = TYPE_LENGTH (type); + char buf[32]; + int i; + + if (sparc64_structure_or_union_p (type)) + { + /* Structure or Union return values. */ + gdb_assert (len <= 32); + + for (i = 0; i < ((len + 7) / 8); i++) + regcache_cooked_read (regcache, SPARC_O0_REGNUM + i, buf + i * 8); + if (TYPE_CODE (type) != TYPE_CODE_UNION) + sparc64_extract_floating_fields (regcache, type, buf, 0); + memcpy (valbuf, buf, len); + } + else if (sparc64_floating_p (type)) + { + /* Floating return values. */ + for (i = 0; i < len / 4; i++) + regcache_cooked_read (regcache, SPARC_F0_REGNUM + i, buf + i * 4); + memcpy (valbuf, buf, len); + } + else + { + /* Integral and pointer return values. */ + gdb_assert (sparc64_integral_or_pointer_p (type)); + + /* Just stripping off any unused bytes should preserve the + signed-ness just fine. */ + regcache_cooked_read (regcache, SPARC_O0_REGNUM, buf); + memcpy (valbuf, buf + 8 - len, len); + } +} + +/* Write into the appropriate registers a function return value stored + in VALBUF of type TYPE. */ + +static void +sparc64_store_return_value (struct type *type, struct regcache *regcache, + const void *valbuf) +{ + int len = TYPE_LENGTH (type); + char buf[16]; + int i; + + if (sparc64_structure_or_union_p (type)) + { + /* Structure or Union return values. */ + gdb_assert (len <= 32); + + /* Simplify matters by storing the complete value (including + floating members) into %o0 and %o1. Floating members are + also store in the appropriate floating-point registers. */ + memset (buf, 0, sizeof (buf)); + memcpy (buf, valbuf, len); + for (i = 0; i < ((len + 7) / 8); i++) + regcache_cooked_write (regcache, SPARC_O0_REGNUM + i, buf + i * 4); + if (TYPE_CODE (type) != TYPE_CODE_UNION) + sparc64_store_floating_fields (regcache, type, buf, 0, 0); + } + else if (sparc64_floating_p (type)) + { + /* Floating return values. */ + memcpy (buf, valbuf, len); + for (i = 0; i < len / 4; i++) + regcache_cooked_write (regcache, SPARC_F0_REGNUM + i, buf + i * 4); + } + else + { + /* Integral and pointer return values. */ + gdb_assert (sparc64_integral_or_pointer_p (type)); + + /* ??? Do we need to do any sign-extension here? */ + memset (buf, 0, 8); + memcpy (buf + 8 - len, valbuf, len); + regcache_cooked_write (regcache, SPARC_O0_REGNUM, buf); + } +} + +/* Extract from REGCACHE, which contains the (raw) register state, the + address in which a function should return its structure value, as a + CORE_ADDR. */ + +static CORE_ADDR +sparc_extract_struct_value_address (struct regcache *regcache) +{ + ULONGEST addr; + + regcache_cooked_read_unsigned (regcache, SPARC_O0_REGNUM, &addr); + return addr; +} + +static int +sparc64_use_struct_convention (int gcc_p, struct type *type) +{ + /* Structure and union types up to 32 bytes in size are returned in + registers. */ + return (TYPE_LENGTH (type) > 32); +} + + +/* The SPARC Architecture doesn't have hardware single-step support, + and most operating systems don't implement it either, so we provide + software single-step mechanism. */ + +static CORE_ADDR +sparc_analyze_control_transfer (CORE_ADDR pc, CORE_ADDR *npc) +{ + unsigned long insn = sparc_fetch_instruction (pc); + int conditional_p = X_COND (insn) & 0x7; + int branch_p = 0; + long offset = 0; /* Must be signed for sign-extend. */ + + if (X_OP (insn) == 0 && X_OP2 (insn) == 3 && (insn & 0x1000000) == 0) + { + /* Branch on Integer Register with Prediction (BPr). */ + branch_p = 1; + conditional_p = 1; + } + else if (X_OP (insn) == 0 && X_OP2 (insn) == 6) + { + /* Branch on Floating-Point Condition Codes (FBfcc). */ + branch_p = 1; + offset = 4 * X_DISP22 (insn); + } + else if (X_OP (insn) == 0 && X_OP2 (insn) == 5) + { + /* Branch on Floating-Point Condition Codes with Prediction + (FBPfcc). */ + branch_p = 1; + offset = 4 * X_DISP19 (insn); + } + else if (X_OP (insn) == 0 && X_OP2 (insn) == 2) + { + /* Branch on Integer Condition Codes (Bicc). */ + branch_p = 1; + offset = 4 * X_DISP22 (insn); + } + else if (X_OP (insn) == 0 && X_OP2 (insn) == 1) + { + /* Branch on Integer Condition Codes with Prediction (BPcc). */ + branch_p = 1; + offset = 4 * X_DISP19 (insn); + } + + /* FIXME: Handle DONE and RETRY instructions. */ + + /* FIXME: Handle the Trap instruction. */ + + if (branch_p) + { + if (conditional_p) + { + /* For conditional branches, return nPC + 4 iff the annul + bit is 1. */ + return (X_A (insn) ? *npc + 4 : 0); + } + else + { + /* For unconditional branches, return the target if its + specified condition is "always" and return nPC + 4 if the + condition is "never". If the annul bit is 1, set *NPC to + zero. */ + if (X_COND (insn) == 0x0) + pc = *npc, offset = 4; + if (X_A (insn)) + *npc = 0; + + gdb_assert (offset != 0); + return pc + offset; + } + } + + return 0; +} + +void +sparc_software_single_step (enum target_signal sig, int insert_breakpoints_p) +{ + static CORE_ADDR npc, nnpc; + static char npc_save[4], nnpc_save[4]; + + if (insert_breakpoints_p) + { + CORE_ADDR pc; + + gdb_assert (npc == 0); + gdb_assert (nnpc == 0); + + pc = sparc_address_from_register (SPARC64_PC_REGNUM); + npc = sparc_address_from_register (SPARC64_NPC_REGNUM); + + /* Analyze the instruction at PC. */ + nnpc = sparc_analyze_control_transfer (pc, &npc); + if (npc != 0) + target_insert_breakpoint (npc, npc_save); + if (nnpc != 0) + target_insert_breakpoint (nnpc, nnpc_save); + + /* Assert that we have set at least one breakpoint. */ + gdb_assert (npc != 0 || nnpc != 0); + } + else + { + if (npc != 0) + target_remove_breakpoint (npc, npc_save); + if (nnpc != 0) + target_remove_breakpoint (nnpc, nnpc_save); + + npc = 0; + nnpc = 0; + } +} + + +static struct gdbarch * +sparc64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) +{ + struct gdbarch_tdep *tdep; + struct gdbarch *gdbarch; + + /* If there is already a candidate, use it. */ + arches = gdbarch_list_lookup_by_info (arches, &info); + if (arches != NULL) + return arches->gdbarch; + + /* Allocate space for the new architecture. */ + tdep = XMALLOC (struct gdbarch_tdep); + gdbarch = gdbarch_alloc (&info, tdep); + + set_gdbarch_long_bit (gdbarch, 64); + set_gdbarch_long_long_bit (gdbarch, 64); + set_gdbarch_ptr_bit (gdbarch, 64); + set_gdbarch_long_double_bit (gdbarch, 128); + + set_gdbarch_num_regs (gdbarch, SPARC64_NUM_REGS); + set_gdbarch_register_name (gdbarch, sparc64_register_name); + set_gdbarch_register_type (gdbarch, sparc64_register_type); + set_gdbarch_num_pseudo_regs (gdbarch, SPARC64_NUM_PSEUDO_REGS); + set_gdbarch_pseudo_register_read (gdbarch, sparc64_pseudo_register_read); + set_gdbarch_pseudo_register_write (gdbarch, sparc64_pseudo_register_write); + + /* Register numbers of various important registers. */ + set_gdbarch_sp_regnum (gdbarch, SPARC_SP_REGNUM); /* %sp */ + set_gdbarch_pc_regnum (gdbarch, SPARC64_PC_REGNUM); /* %pc */ + set_gdbarch_npc_regnum (gdbarch, SPARC64_NPC_REGNUM); + set_gdbarch_fp0_regnum (gdbarch, SPARC_F0_REGNUM); /* %f0 */ + + /* Call dummy code. */ + set_gdbarch_push_dummy_call (gdbarch, sparc64_push_dummy_call); + + set_gdbarch_extract_return_value (gdbarch, sparc64_extract_return_value); + set_gdbarch_store_return_value (gdbarch, sparc64_store_return_value); + set_gdbarch_extract_struct_value_address + (gdbarch, sparc_extract_struct_value_address); + set_gdbarch_use_struct_convention (gdbarch, sparc64_use_struct_convention); + + set_gdbarch_skip_prologue (gdbarch, sparc64_skip_prologue); + + /* Stack grows downward. */ + set_gdbarch_inner_than (gdbarch, core_addr_lessthan); + + set_gdbarch_breakpoint_from_pc (gdbarch, sparc_breakpoint_from_pc); + set_gdbarch_decr_pc_after_break (gdbarch, 0); + set_gdbarch_function_start_offset (gdbarch, 0); + + set_gdbarch_frame_args_skip (gdbarch, 8); + + set_gdbarch_print_insn (gdbarch, print_insn_sparc); + + set_gdbarch_software_single_step (gdbarch, sparc_software_single_step); + + set_gdbarch_unwind_dummy_id (gdbarch, sparc_unwind_dummy_id); + + set_gdbarch_unwind_pc (gdbarch, sparc64_unwind_pc); + + frame_base_set_default (gdbarch, &sparc64_frame_base); + + /* Hook in ABI-specific overrides, if they have been registered. */ + gdbarch_init_osabi (info, gdbarch); + + frame_unwind_append_sniffer (gdbarch, sparc64_frame_sniffer); + + return gdbarch; +} + +/* Helper functions for dealing with register windows. */ + +static void +sparc_supply_rwindow (CORE_ADDR sp, int regnum) +{ + int offset = 0; + char buf[8]; + int i; + + /* Clear out the top half of the temporary buffer, and put the + register value in the bottom half if we're in 64-bit mode. */ + if (gdbarch_ptr_bit (current_gdbarch) == 64) + { + memset (buf, 0, 4); + offset = 4; + } + + for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) + { + if (regnum == i || regnum == -1) + { + target_read_memory (sp + ((i - SPARC_L0_REGNUM) * 4), + buf + offset, 4); + supply_register (i, buf); + } + } +} + +void +sparc64_supply_rwindow (CORE_ADDR sp, int regnum) +{ + if (sp & 1) + { + char buf[8]; + int i; + + /* Registers are 64-bit. */ + sp += BIAS; + + for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) + { + if (regnum == i || regnum == -1) + { + target_read_memory (sp + ((i - SPARC_L0_REGNUM) * 8), + buf, sizeof (buf)); + supply_register (i, buf); + } + } + } + else + { + /* Registers are 32-bit. Toss any sign-extension of the stack + pointer. */ + sparc_supply_rwindow (sp & 0xffffffffUL, regnum); + } +} + +static void +sparc_fill_rwindow (CORE_ADDR sp, int regnum) +{ + int offset = 0; + char buf[8]; + int i; + + /* Only use the bottom half if we're in 64-bit mode. */ + if (gdbarch_ptr_bit (current_gdbarch) == 64) + offset = 4; + + for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) + { + if (regnum == -1 || regnum == SPARC_SP_REGNUM || regnum == i) + { + regcache_collect (i, buf); + target_write_memory (sp + ((i - SPARC_L0_REGNUM) * 4), buf, 4); + } + } +} + +void +sparc64_fill_rwindow (CORE_ADDR sp, int regnum) +{ + if (sp & 1) + { + char buf[8]; + int i; + + /* Registers are 64-bit. */ + sp += BIAS; + + for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) + { + if (regnum == -1 || regnum == SPARC_SP_REGNUM || regnum == i) + { + regcache_collect (i, buf); + target_write_memory (sp + ((i - SPARC_L0_REGNUM) * 8), + buf, sizeof (buf)); + } + } + } + else + { + /* Registers are 32-bit. Toss any sign-extension of the stack + pointer. */ + sparc_fill_rwindow (sp & 0xffffffffUL, regnum); + } +} + + +/* Provide a prototype to silence -Wmissing-prototypes. */ +void _initialize_sparc64_tdep (void); + +void +_initialize_sparc64_tdep (void) +{ + register_gdbarch_init (bfd_arch_sparc, sparc64_gdbarch_init); +} |