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Diffstat (limited to 'gdb/sh-tdep.c')
| -rw-r--r-- | gdb/sh-tdep.c | 732 |
1 files changed, 0 insertions, 732 deletions
diff --git a/gdb/sh-tdep.c b/gdb/sh-tdep.c deleted file mode 100644 index 6f9e4cc..0000000 --- a/gdb/sh-tdep.c +++ /dev/null @@ -1,732 +0,0 @@ -/* Target-dependent code for Hitachi Super-H, for GDB. - Copyright 1993, 1994, 1995, 1996, 1997, 1998 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. */ - -/* - Contributed by Steve Chamberlain - sac@cygnus.com - */ - -#include "defs.h" -#include "frame.h" -#include "obstack.h" -#include "symtab.h" -#include "symfile.h" -#include "gdbtypes.h" -#include "gdbcmd.h" -#include "gdbcore.h" -#include "value.h" -#include "dis-asm.h" -#include "inferior.h" /* for BEFORE_TEXT_END etc. */ -#include "gdb_string.h" - -/* A set of original names, to be used when restoring back to generic - registers from a specific set. */ - -static char *sh_generic_reg_names[] = { - "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", - "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", - "pc", "pr", "gbr", "vbr", "mach", "macl", "sr", - "fpul", "fpscr", - "fr0", "fr1", "fr2", "fr3", "fr4", "fr5", "fr6", "fr7", - "fr8", "fr9", "fr10", "fr11", "fr12", "fr13", "fr14", "fr15", - "ssr", "spc", - "r0b0", "r1b0", "r2b0", "r3b0", "r4b0", "r5b0", "r6b0", "r7b0", - "r0b1", "r1b1", "r2b1", "r3b1", "r4b1", "r5b1", "r6b1", "r7b1", -}; - -static char *sh_reg_names[] = { - "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", - "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", - "pc", "pr", "gbr", "vbr", "mach", "macl", "sr", - "", "", - "", "", "", "", "", "", "", "", - "", "", "", "", "", "", "", "", - "", "", - "", "", "", "", "", "", "", "", - "", "", "", "", "", "", "", "", -}; - -static char *sh3_reg_names[] = { - "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", - "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", - "pc", "pr", "gbr", "vbr", "mach", "macl", "sr", - "", "", - "", "", "", "", "", "", "", "", - "", "", "", "", "", "", "", "", - "ssr", "spc", - "r0b0", "r1b0", "r2b0", "r3b0", "r4b0", "r5b0", "r6b0", "r7b0", - "r0b1", "r1b1", "r2b1", "r3b1", "r4b1", "r5b1", "r6b1", "r7b1" -}; - -static char *sh3e_reg_names[] = { - "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", - "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", - "pc", "pr", "gbr", "vbr", "mach", "macl", "sr", - "fpul", "fpscr", - "fr0", "fr1", "fr2", "fr3", "fr4", "fr5", "fr6", "fr7", - "fr8", "fr9", "fr10", "fr11", "fr12", "fr13", "fr14", "fr15", - "ssr", "spc", - "r0b0", "r1b0", "r2b0", "r3b0", "r4b0", "r5b0", "r6b0", "r7b0", - "r0b1", "r1b1", "r2b1", "r3b1", "r4b1", "r5b1", "r6b1", "r7b1", -}; - -char **sh_register_names = sh_generic_reg_names; - - -struct { - char **regnames; - int mach; -} sh_processor_type_table[] = { - { sh_reg_names, bfd_mach_sh }, - { sh3_reg_names, bfd_mach_sh3 }, - { sh3e_reg_names, bfd_mach_sh3e }, - { sh3e_reg_names, bfd_mach_sh4 }, - { NULL, 0 } -}; - -/* Prologue looks like - [mov.l <regs>,@-r15]... - [sts.l pr,@-r15] - [mov.l r14,@-r15] - [mov r15,r14] -*/ - -#define IS_STS(x) ((x) == 0x4f22) -#define IS_PUSH(x) (((x) & 0xff0f) == 0x2f06) -#define GET_PUSHED_REG(x) (((x) >> 4) & 0xf) -#define IS_MOV_SP_FP(x) ((x) == 0x6ef3) -#define IS_ADD_SP(x) (((x) & 0xff00) == 0x7f00) -#define IS_MOV_R3(x) (((x) & 0xff00) == 0x1a00) -#define IS_SHLL_R3(x) ((x) == 0x4300) -#define IS_ADD_R3SP(x) ((x) == 0x3f3c) -#define IS_FMOV(x) (((x) & 0xf00f) == 0xf00b) -#define FPSCR_SZ (1 << 20) - - -/* Should call_function allocate stack space for a struct return? */ -int -sh_use_struct_convention (gcc_p, type) - int gcc_p; - struct type *type; -{ - return (TYPE_LENGTH (type) > 1); -} - - -/* Skip any prologue before the guts of a function */ - -CORE_ADDR -sh_skip_prologue (start_pc) - CORE_ADDR start_pc; -{ - int w; - - w = read_memory_integer (start_pc, 2); - while (IS_STS (w) - || IS_FMOV (w) - || IS_PUSH (w) - || IS_MOV_SP_FP (w) - || IS_MOV_R3 (w) - || IS_ADD_R3SP (w) - || IS_ADD_SP (w) - || IS_SHLL_R3 (w)) - { - start_pc += 2; - w = read_memory_integer (start_pc, 2); - } - - return start_pc; -} - -/* Disassemble an instruction. */ - -int -gdb_print_insn_sh (memaddr, info) - bfd_vma memaddr; - disassemble_info *info; -{ - if (TARGET_BYTE_ORDER == BIG_ENDIAN) - return print_insn_sh (memaddr, info); - else - return print_insn_shl (memaddr, info); -} - -/* Given a GDB frame, determine the address of the calling function's frame. - This will be used to create a new GDB frame struct, and then - INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. - - For us, the frame address is its stack pointer value, so we look up - the function prologue to determine the caller's sp value, and return it. */ - -CORE_ADDR -sh_frame_chain (frame) - struct frame_info *frame; -{ - if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) - return frame->frame; /* dummy frame same as caller's frame */ - if (!inside_entry_file (frame->pc)) - return read_memory_integer (FRAME_FP (frame) + frame->f_offset, 4); - else - return 0; -} - -/* Find REGNUM on the stack. Otherwise, it's in an active register. One thing - we might want to do here is to check REGNUM against the clobber mask, and - somehow flag it as invalid if it isn't saved on the stack somewhere. This - would provide a graceful failure mode when trying to get the value of - caller-saves registers for an inner frame. */ - -CORE_ADDR -sh_find_callers_reg (fi, regnum) - struct frame_info *fi; - int regnum; -{ - struct frame_saved_regs fsr; - - for (; fi; fi = fi->next) - if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) - /* When the caller requests PR from the dummy frame, we return PC because - that's where the previous routine appears to have done a call from. */ - return generic_read_register_dummy (fi->pc, fi->frame, regnum); - else - { - FRAME_FIND_SAVED_REGS(fi, fsr); - if (fsr.regs[regnum] != 0) - return read_memory_integer (fsr.regs[regnum], - REGISTER_RAW_SIZE(regnum)); - } - return read_register (regnum); -} - -/* Put here the code to store, into a struct frame_saved_regs, the - addresses of the saved registers of frame described by FRAME_INFO. - This includes special registers such as pc and fp saved in special - ways in the stack frame. sp is even more special: the address we - return for it IS the sp for the next frame. */ - -void -sh_frame_find_saved_regs (fi, fsr) - struct frame_info *fi; - struct frame_saved_regs *fsr; -{ - int where[NUM_REGS]; - int rn; - int have_fp = 0; - int depth; - int pc; - int opc; - int insn; - int r3_val = 0; - char * dummy_regs = generic_find_dummy_frame (fi->pc, fi->frame); - - if (dummy_regs) - { - /* DANGER! This is ONLY going to work if the char buffer format of - the saved registers is byte-for-byte identical to the - CORE_ADDR regs[NUM_REGS] format used by struct frame_saved_regs! */ - memcpy (&fsr->regs, dummy_regs, sizeof(fsr)); - return; - } - - opc = pc = get_pc_function_start (fi->pc); - - insn = read_memory_integer (pc, 2); - - fi->leaf_function = 1; - fi->f_offset = 0; - - for (rn = 0; rn < NUM_REGS; rn++) - where[rn] = -1; - - depth = 0; - - /* Loop around examining the prologue insns until we find something - that does not appear to be part of the prologue. But give up - after 20 of them, since we're getting silly then. */ - - while (pc < opc + 20 * 2) - { - /* See where the registers will be saved to */ - if (IS_PUSH (insn)) - { - pc += 2; - rn = GET_PUSHED_REG (insn); - where[rn] = depth; - insn = read_memory_integer (pc, 2); - depth += 4; - } - else if (IS_STS (insn)) - { - pc += 2; - where[PR_REGNUM] = depth; - insn = read_memory_integer (pc, 2); - /* If we're storing the pr then this isn't a leaf */ - fi->leaf_function = 0; - depth += 4; - } - else if (IS_MOV_R3 (insn)) - { - r3_val = ((insn & 0xff) ^ 0x80) - 0x80; - pc += 2; - insn = read_memory_integer (pc, 2); - } - else if (IS_SHLL_R3 (insn)) - { - r3_val <<= 1; - pc += 2; - insn = read_memory_integer (pc, 2); - } - else if (IS_ADD_R3SP (insn)) - { - depth += -r3_val; - pc += 2; - insn = read_memory_integer (pc, 2); - } - else if (IS_ADD_SP (insn)) - { - pc += 2; - depth -= ((insn & 0xff) ^ 0x80) - 0x80; - insn = read_memory_integer (pc, 2); - } - else if (IS_FMOV (insn)) - { - pc += 2; - insn = read_memory_integer (pc, 2); - if (read_register (FPSCR_REGNUM) & FPSCR_SZ) - { - depth += 8; - } - else - { - depth += 4; - } - } - else - break; - } - - /* Now we know how deep things are, we can work out their addresses */ - - for (rn = 0; rn < NUM_REGS; rn++) - { - if (where[rn] >= 0) - { - if (rn == FP_REGNUM) - have_fp = 1; - - fsr->regs[rn] = fi->frame - where[rn] + depth - 4; - } - else - { - fsr->regs[rn] = 0; - } - } - - if (have_fp) - { - fsr->regs[SP_REGNUM] = read_memory_integer (fsr->regs[FP_REGNUM], 4); - } - else - { - fsr->regs[SP_REGNUM] = fi->frame - 4; - } - - fi->f_offset = depth - where[FP_REGNUM] - 4; - /* Work out the return pc - either from the saved pr or the pr - value */ -} - -/* initialize the extra info saved in a FRAME */ - -void -sh_init_extra_frame_info (fromleaf, fi) - int fromleaf; - struct frame_info *fi; -{ - struct frame_saved_regs fsr; - - if (fi->next) - fi->pc = FRAME_SAVED_PC (fi->next); - - if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) - { - /* We need to setup fi->frame here because run_stack_dummy gets it wrong - by assuming it's always FP. */ - fi->frame = generic_read_register_dummy (fi->pc, fi->frame, - SP_REGNUM); - fi->return_pc = generic_read_register_dummy (fi->pc, fi->frame, - PC_REGNUM); - fi->f_offset = -(CALL_DUMMY_LENGTH + 4); - fi->leaf_function = 0; - return; - } - else - { - FRAME_FIND_SAVED_REGS (fi, fsr); - fi->return_pc = sh_find_callers_reg (fi, PR_REGNUM); - } -} - -/* Discard from the stack the innermost frame, - restoring all saved registers. */ - -void -sh_pop_frame () -{ - register struct frame_info *frame = get_current_frame (); - register CORE_ADDR fp; - register int regnum; - struct frame_saved_regs fsr; - - if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) - generic_pop_dummy_frame (); - else - { - fp = FRAME_FP (frame); - get_frame_saved_regs (frame, &fsr); - - /* Copy regs from where they were saved in the frame */ - for (regnum = 0; regnum < NUM_REGS; regnum++) - if (fsr.regs[regnum]) - write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); - - write_register (PC_REGNUM, frame->return_pc); - write_register (SP_REGNUM, fp + 4); - } - flush_cached_frames (); -} - -/* Function: push_arguments - Setup the function arguments for calling a function in the inferior. - - On the Hitachi SH architecture, there are four registers (R4 to R7) - which are dedicated for passing function arguments. Up to the first - four arguments (depending on size) may go into these registers. - The rest go on the stack. - - Arguments that are smaller than 4 bytes will still take up a whole - register or a whole 32-bit word on the stack, and will be - right-justified in the register or the stack word. This includes - chars, shorts, and small aggregate types. - - Arguments that are larger than 4 bytes may be split between two or - more registers. If there are not enough registers free, an argument - may be passed partly in a register (or registers), and partly on the - stack. This includes doubles, long longs, and larger aggregates. - As far as I know, there is no upper limit to the size of aggregates - that will be passed in this way; in other words, the convention of - passing a pointer to a large aggregate instead of a copy is not used. - - An exceptional case exists for struct arguments (and possibly other - aggregates such as arrays) if the size is larger than 4 bytes but - not a multiple of 4 bytes. In this case the argument is never split - between the registers and the stack, but instead is copied in its - entirety onto the stack, AND also copied into as many registers as - there is room for. In other words, space in registers permitting, - two copies of the same argument are passed in. As far as I can tell, - only the one on the stack is used, although that may be a function - of the level of compiler optimization. I suspect this is a compiler - bug. Arguments of these odd sizes are left-justified within the - word (as opposed to arguments smaller than 4 bytes, which are - right-justified). - - - If the function is to return an aggregate type such as a struct, it - is either returned in the normal return value register R0 (if its - size is no greater than one byte), or else the caller must allocate - space into which the callee will copy the return value (if the size - is greater than one byte). In this case, a pointer to the return - value location is passed into the callee in register R2, which does - not displace any of the other arguments passed in via registers R4 - to R7. */ - -CORE_ADDR -sh_push_arguments (nargs, args, sp, struct_return, struct_addr) - int nargs; - value_ptr *args; - CORE_ADDR sp; - unsigned char struct_return; - CORE_ADDR struct_addr; -{ - int stack_offset, stack_alloc; - int argreg; - int argnum; - struct type *type; - CORE_ADDR regval; - char *val; - char valbuf[4]; - int len; - int odd_sized_struct; - - /* first force sp to a 4-byte alignment */ - sp = sp & ~3; - - /* The "struct return pointer" pseudo-argument has its own dedicated - register */ - if (struct_return) - write_register (STRUCT_RETURN_REGNUM, struct_addr); - - /* Now make sure there's space on the stack */ - for (argnum = 0, stack_alloc = 0; - argnum < nargs; argnum++) - stack_alloc += ((TYPE_LENGTH(VALUE_TYPE(args[argnum])) + 3) & ~3); - sp -= stack_alloc; /* make room on stack for args */ - - - /* Now load as many as possible of the first arguments into - registers, and push the rest onto the stack. There are 16 bytes - in four registers available. Loop thru args from first to last. */ - - argreg = ARG0_REGNUM; - for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++) - { - type = VALUE_TYPE (args[argnum]); - len = TYPE_LENGTH (type); - memset(valbuf, 0, sizeof(valbuf)); - if (len < 4) - { /* value gets right-justified in the register or stack word */ - memcpy(valbuf + (4 - len), - (char *) VALUE_CONTENTS (args[argnum]), len); - val = valbuf; - } - else - val = (char *) VALUE_CONTENTS (args[argnum]); - - if (len > 4 && (len & 3) != 0) - odd_sized_struct = 1; /* such structs go entirely on stack */ - else - odd_sized_struct = 0; - while (len > 0) - { - if (argreg > ARGLAST_REGNUM || odd_sized_struct) - { /* must go on the stack */ - write_memory (sp + stack_offset, val, 4); - stack_offset += 4; - } - /* NOTE WELL!!!!! This is not an "else if" clause!!! - That's because some *&^%$ things get passed on the stack - AND in the registers! */ - if (argreg <= ARGLAST_REGNUM) - { /* there's room in a register */ - regval = extract_address (val, REGISTER_RAW_SIZE(argreg)); - write_register (argreg++, regval); - } - /* Store the value 4 bytes at a time. This means that things - larger than 4 bytes may go partly in registers and partly - on the stack. */ - len -= REGISTER_RAW_SIZE(argreg); - val += REGISTER_RAW_SIZE(argreg); - } - } - return sp; -} - -/* Function: push_return_address (pc) - Set up the return address for the inferior function call. - Needed for targets where we don't actually execute a JSR/BSR instruction */ - -CORE_ADDR -sh_push_return_address (pc, sp) - CORE_ADDR pc; - CORE_ADDR sp; -{ - write_register (PR_REGNUM, CALL_DUMMY_ADDRESS ()); - return sp; -} - -/* Function: fix_call_dummy - Poke the callee function's address into the destination part of - the CALL_DUMMY. The address is actually stored in a data word - following the actualy CALL_DUMMY instructions, which will load - it into a register using PC-relative addressing. This function - expects the CALL_DUMMY to look like this: - - mov.w @(2,PC), R8 - jsr @R8 - nop - trap - <destination> - */ - -#if 0 -void -sh_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) - char *dummy; - CORE_ADDR pc; - CORE_ADDR fun; - int nargs; - value_ptr *args; - struct type *type; - int gcc_p; -{ - *(unsigned long *) (dummy + 8) = fun; -} -#endif - -/* Function: get_saved_register - Just call the generic_get_saved_register function. */ - -void -get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval) - char *raw_buffer; - int *optimized; - CORE_ADDR *addrp; - struct frame_info *frame; - int regnum; - enum lval_type *lval; -{ - generic_get_saved_register (raw_buffer, optimized, addrp, - frame, regnum, lval); -} - - -/* Modify the actual processor type. */ - -int -sh_target_architecture_hook (ap) - const bfd_arch_info_type *ap; -{ - int i, j; - - if (ap->arch != bfd_arch_sh) - return 0; - - for (i = 0; sh_processor_type_table[i].regnames != NULL; i++) - { - if (sh_processor_type_table[i].mach == ap->mach) - { - sh_register_names = sh_processor_type_table[i].regnames; - return 1; - } - } - - fatal ("Architecture `%s' unreconized", ap->printable_name); -} - -/* Print the registers in a form similar to the E7000 */ - -static void -sh_show_regs (args, from_tty) - char *args; - int from_tty; -{ - int cpu; - if (TARGET_ARCHITECTURE->arch == bfd_arch_sh) - cpu = TARGET_ARCHITECTURE->mach; - else - cpu = 0; - /* FIXME: sh4 has more registers */ - if (cpu == bfd_mach_sh4) - cpu = bfd_mach_sh3; - - printf_filtered ("PC=%08x SR=%08x PR=%08x MACH=%08x MACHL=%08x\n", - read_register (PC_REGNUM), - read_register (SR_REGNUM), - read_register (PR_REGNUM), - read_register (MACH_REGNUM), - read_register (MACL_REGNUM)); - - printf_filtered ("GBR=%08x VBR=%08x", - read_register (GBR_REGNUM), - read_register (VBR_REGNUM)); - if (cpu == bfd_mach_sh3 || cpu == bfd_mach_sh3e) - { - printf_filtered (" SSR=%08x SPC=%08x", - read_register (SSR_REGNUM), - read_register (SPC_REGNUM)); - if (cpu == bfd_mach_sh3e) - { - printf_filtered (" FPUL=%08x FPSCR=%08x", - read_register (FPUL_REGNUM), - read_register (FPSCR_REGNUM)); - } - } - - printf_filtered ("\nR0-R7 %08x %08x %08x %08x %08x %08x %08x %08x\n", - read_register (0), - read_register (1), - read_register (2), - read_register (3), - read_register (4), - read_register (5), - read_register (6), - read_register (7)); - printf_filtered ("R8-R15 %08x %08x %08x %08x %08x %08x %08x %08x\n", - read_register (8), - read_register (9), - read_register (10), - read_register (11), - read_register (12), - read_register (13), - read_register (14), - read_register (15)); - if (cpu == bfd_mach_sh3e) - { - printf_filtered ("FP0-FP7 %08x %08x %08x %08x %08x %08x %08x %08x\n", - read_register (FP0_REGNUM + 0), - read_register (FP0_REGNUM + 1), - read_register (FP0_REGNUM + 2), - read_register (FP0_REGNUM + 3), - read_register (FP0_REGNUM + 4), - read_register (FP0_REGNUM + 5), - read_register (FP0_REGNUM + 6), - read_register (FP0_REGNUM + 7)); - printf_filtered ("FP8-FP15 %08x %08x %08x %08x %08x %08x %08x %08x\n", - read_register (FP0_REGNUM + 8), - read_register (FP0_REGNUM + 9), - read_register (FP0_REGNUM + 10), - read_register (FP0_REGNUM + 11), - read_register (FP0_REGNUM + 12), - read_register (FP0_REGNUM + 13), - read_register (FP0_REGNUM + 14), - read_register (FP0_REGNUM + 15)); - } -} - -/* Function: extract_return_value - Find a function's return value in the appropriate registers (in regbuf), - and copy it into valbuf. */ - -void -sh_extract_return_value (type, regbuf, valbuf) - struct type *type; - void *regbuf; - void *valbuf; -{ - int len = TYPE_LENGTH(type); - - if (len <= 4) - memcpy (valbuf, ((char *) regbuf) + 4 - len, len); - else if (len <= 8) - memcpy (valbuf, ((char *) regbuf) + 8 - len, len); - else - error ("bad size for return value"); -} - -void -_initialize_sh_tdep () -{ - struct cmd_list_element *c; - - tm_print_insn = gdb_print_insn_sh; - - target_architecture_hook = sh_target_architecture_hook; - - add_com ("regs", class_vars, sh_show_regs, "Print all registers"); -} |