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Diffstat (limited to 'gdb/s390-tdep.c')
| -rw-r--r-- | gdb/s390-tdep.c | 1886 |
1 files changed, 0 insertions, 1886 deletions
diff --git a/gdb/s390-tdep.c b/gdb/s390-tdep.c deleted file mode 100644 index 49a15a2..0000000 --- a/gdb/s390-tdep.c +++ /dev/null @@ -1,1886 +0,0 @@ -/* Target-dependent code for GDB, the GNU debugger. - - Copyright 2001, 2002 Free Software Foundation, Inc. - - Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) - for IBM Deutschland Entwicklung GmbH, IBM Corporation. - - 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. */ - -#define S390_TDEP /* for special macros in tm-s390.h */ -#include <defs.h> -#include "arch-utils.h" -#include "frame.h" -#include "inferior.h" -#include "symtab.h" -#include "target.h" -#include "gdbcore.h" -#include "gdbcmd.h" -#include "symfile.h" -#include "objfiles.h" -#include "tm.h" -#include "../bfd/bfd.h" -#include "floatformat.h" -#include "regcache.h" -#include "value.h" -#include "gdb_assert.h" - - - - -/* Number of bytes of storage in the actual machine representation - for register N. */ -int -s390_register_raw_size (int reg_nr) -{ - if (S390_FP0_REGNUM <= reg_nr - && reg_nr < S390_FP0_REGNUM + S390_NUM_FPRS) - return S390_FPR_SIZE; - else - return 4; -} - -int -s390x_register_raw_size (int reg_nr) -{ - return (reg_nr == S390_FPC_REGNUM) - || (reg_nr >= S390_FIRST_ACR && reg_nr <= S390_LAST_ACR) ? 4 : 8; -} - -int -s390_cannot_fetch_register (int regno) -{ - return (regno >= S390_FIRST_CR && regno < (S390_FIRST_CR + 9)) || - (regno >= (S390_FIRST_CR + 12) && regno <= S390_LAST_CR); -} - -int -s390_register_byte (int reg_nr) -{ - if (reg_nr <= S390_GP_LAST_REGNUM) - return reg_nr * S390_GPR_SIZE; - if (reg_nr <= S390_LAST_ACR) - return S390_ACR0_OFFSET + (((reg_nr) - S390_FIRST_ACR) * S390_ACR_SIZE); - if (reg_nr <= S390_LAST_CR) - return S390_CR0_OFFSET + (((reg_nr) - S390_FIRST_CR) * S390_CR_SIZE); - if (reg_nr == S390_FPC_REGNUM) - return S390_FPC_OFFSET; - else - return S390_FP0_OFFSET + (((reg_nr) - S390_FP0_REGNUM) * S390_FPR_SIZE); -} - -#ifndef GDBSERVER -#define S390_MAX_INSTR_SIZE (6) -#define S390_SYSCALL_OPCODE (0x0a) -#define S390_SYSCALL_SIZE (2) -#define S390_SIGCONTEXT_SREGS_OFFSET (8) -#define S390X_SIGCONTEXT_SREGS_OFFSET (8) -#define S390_SIGREGS_FP0_OFFSET (144) -#define S390X_SIGREGS_FP0_OFFSET (216) -#define S390_UC_MCONTEXT_OFFSET (256) -#define S390X_UC_MCONTEXT_OFFSET (344) -#define S390_STACK_FRAME_OVERHEAD (GDB_TARGET_IS_ESAME ? 160:96) -#define S390_SIGNAL_FRAMESIZE (GDB_TARGET_IS_ESAME ? 160:96) -#define s390_NR_sigreturn 119 -#define s390_NR_rt_sigreturn 173 - - - -struct frame_extra_info -{ - int initialised; - int good_prologue; - CORE_ADDR function_start; - CORE_ADDR skip_prologue_function_start; - CORE_ADDR saved_pc_valid; - CORE_ADDR saved_pc; - CORE_ADDR sig_fixed_saved_pc_valid; - CORE_ADDR sig_fixed_saved_pc; - CORE_ADDR frame_pointer_saved_pc; /* frame pointer needed for alloca */ - CORE_ADDR stack_bought; /* amount we decrement the stack pointer by */ - CORE_ADDR sigcontext; -}; - - -static CORE_ADDR s390_frame_saved_pc_nofix (struct frame_info *fi); - -int -s390_readinstruction (bfd_byte instr[], CORE_ADDR at, - struct disassemble_info *info) -{ - int instrlen; - - static int s390_instrlen[] = { - 2, - 4, - 4, - 6 - }; - if ((*info->read_memory_func) (at, &instr[0], 2, info)) - return -1; - instrlen = s390_instrlen[instr[0] >> 6]; - if (instrlen > 2) - { - if ((*info->read_memory_func) (at + 2, &instr[2], instrlen - 2, info)) - return -1; - } - return instrlen; -} - -static void -s390_memset_extra_info (struct frame_extra_info *fextra_info) -{ - memset (fextra_info, 0, sizeof (struct frame_extra_info)); -} - - - -const char * -s390_register_name (int reg_nr) -{ - static char *register_names[] = { - "pswm", "pswa", - "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", - "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", - "acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7", - "acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15", - "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7", - "cr8", "cr9", "cr10", "cr11", "cr12", "cr13", "cr14", "cr15", - "fpc", - "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", - "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15" - }; - - if (reg_nr <= S390_LAST_REGNUM) - return register_names[reg_nr]; - else - return NULL; -} - - - - -int -s390_stab_reg_to_regnum (int regno) -{ - return regno >= 64 ? S390_PSWM_REGNUM - 64 : - regno >= 48 ? S390_FIRST_ACR - 48 : - regno >= 32 ? S390_FIRST_CR - 32 : - regno <= 15 ? (regno + 2) : - S390_FP0_REGNUM + ((regno - 16) & 8) + (((regno - 16) & 3) << 1) + - (((regno - 16) & 4) >> 2); -} - - -/* Return true if REGIDX is the number of a register used to pass - arguments, false otherwise. */ -static int -is_arg_reg (int regidx) -{ - return 2 <= regidx && regidx <= 6; -} - - -/* s390_get_frame_info based on Hartmuts - prologue definition in - gcc-2.8.1/config/l390/linux.c - - It reads one instruction at a time & based on whether - it looks like prologue code or not it makes a decision on - whether the prologue is over, there are various state machines - in the code to determine if the prologue code is possilby valid. - - This is done to hopefully allow the code survive minor revs of - calling conventions. - - */ - -int -s390_get_frame_info (CORE_ADDR pc, struct frame_extra_info *fextra_info, - struct frame_info *fi, int init_extra_info) -{ -#define CONST_POOL_REGIDX 13 -#define GOT_REGIDX 12 - bfd_byte instr[S390_MAX_INSTR_SIZE]; - CORE_ADDR test_pc = pc, test_pc2; - CORE_ADDR orig_sp = 0, save_reg_addr = 0, *saved_regs = NULL; - int valid_prologue, good_prologue = 0; - int gprs_saved[S390_NUM_GPRS]; - int fprs_saved[S390_NUM_FPRS]; - int regidx, instrlen; - int const_pool_state; - int varargs_state; - int loop_cnt, gdb_gpr_store, gdb_fpr_store; - int offset, expected_offset; - int err = 0; - disassemble_info info; - - /* Have we seen an instruction initializing the frame pointer yet? - If we've seen an `lr %r11, %r15', then frame_pointer_found is - non-zero, and frame_pointer_regidx == 11. Otherwise, - frame_pointer_found is zero and frame_pointer_regidx is 15, - indicating that we're using the stack pointer as our frame - pointer. */ - int frame_pointer_found = 0; - int frame_pointer_regidx = 0xf; - - /* What we've seen so far regarding saving the back chain link: - 0 -- nothing yet; sp still has the same value it had at the entry - point. Since not all functions allocate frames, this is a - valid state for the prologue to finish in. - 1 -- We've saved the original sp in some register other than the - frame pointer (hard-coded to be %r11, yuck). - save_link_regidx is the register we saved it in. - 2 -- We've seen the initial `bras' instruction of the sequence for - reserving more than 32k of stack: - bras %rX, .+8 - .long N - s %r15, 0(%rX) - where %rX is not the constant pool register. - subtract_sp_regidx is %rX, and fextra_info->stack_bought is N. - 3 -- We've reserved space for a new stack frame. This means we - either saw a simple `ahi %r15,-N' in state 1, or the final - `s %r15, ...' in state 2. - 4 -- The frame and link are now fully initialized. We've - reserved space for the new stack frame, and stored the old - stack pointer captured in the back chain pointer field. */ - int save_link_state = 0; - int save_link_regidx, subtract_sp_regidx; - - /* What we've seen so far regarding r12 --- the GOT (Global Offset - Table) pointer. We expect to see `l %r12, N(%r13)', which loads - r12 with the offset from the constant pool to the GOT, and then - an `ar %r12, %r13', which adds the constant pool address, - yielding the GOT's address. Here's what got_state means: - 0 -- seen nothing - 1 -- seen `l %r12, N(%r13)', but no `ar' - 2 -- seen load and add, so GOT pointer is totally initialized - When got_state is 1, then got_load_addr is the address of the - load instruction, and got_load_len is the length of that - instruction. */ - int got_state= 0; - CORE_ADDR got_load_addr = 0, got_load_len = 0; - - const_pool_state = varargs_state = 0; - - memset (gprs_saved, 0, sizeof (gprs_saved)); - memset (fprs_saved, 0, sizeof (fprs_saved)); - info.read_memory_func = dis_asm_read_memory; - - save_link_regidx = subtract_sp_regidx = 0; - if (fextra_info) - { - if (fi && fi->frame) - { - orig_sp = fi->frame; - if (! init_extra_info && fextra_info->initialised) - orig_sp += fextra_info->stack_bought; - saved_regs = fi->saved_regs; - } - if (init_extra_info || !fextra_info->initialised) - { - s390_memset_extra_info (fextra_info); - fextra_info->function_start = pc; - fextra_info->initialised = 1; - } - } - instrlen = 0; - do - { - valid_prologue = 0; - test_pc += instrlen; - /* add the previous instruction len */ - instrlen = s390_readinstruction (instr, test_pc, &info); - if (instrlen < 0) - { - good_prologue = 0; - err = -1; - break; - } - /* We probably are in a glibc syscall */ - if (instr[0] == S390_SYSCALL_OPCODE && test_pc == pc) - { - good_prologue = 1; - if (saved_regs && fextra_info && fi->next && fi->next->extra_info - && fi->next->extra_info->sigcontext) - { - /* We are backtracing from a signal handler */ - save_reg_addr = fi->next->extra_info->sigcontext + - REGISTER_BYTE (S390_GP0_REGNUM); - for (regidx = 0; regidx < S390_NUM_GPRS; regidx++) - { - saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr; - save_reg_addr += S390_GPR_SIZE; - } - save_reg_addr = fi->next->extra_info->sigcontext + - (GDB_TARGET_IS_ESAME ? S390X_SIGREGS_FP0_OFFSET : - S390_SIGREGS_FP0_OFFSET); - for (regidx = 0; regidx < S390_NUM_FPRS; regidx++) - { - saved_regs[S390_FP0_REGNUM + regidx] = save_reg_addr; - save_reg_addr += S390_FPR_SIZE; - } - } - break; - } - if (save_link_state == 0) - { - /* check for a stack relative STMG or STM */ - if (((GDB_TARGET_IS_ESAME && - ((instr[0] == 0xeb) && (instr[5] == 0x24))) || - (instr[0] == 0x90)) && ((instr[2] >> 4) == 0xf)) - { - regidx = (instr[1] >> 4); - if (regidx < 6) - varargs_state = 1; - offset = ((instr[2] & 0xf) << 8) + instr[3]; - expected_offset = - S390_GPR6_STACK_OFFSET + (S390_GPR_SIZE * (regidx - 6)); - if (offset != expected_offset) - { - good_prologue = 0; - break; - } - if (saved_regs) - save_reg_addr = orig_sp + offset; - for (; regidx <= (instr[1] & 0xf); regidx++) - { - if (gprs_saved[regidx]) - { - good_prologue = 0; - break; - } - good_prologue = 1; - gprs_saved[regidx] = 1; - if (saved_regs) - { - saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr; - save_reg_addr += S390_GPR_SIZE; - } - } - valid_prologue = 1; - continue; - } - } - /* check for a stack relative STG or ST */ - if ((save_link_state == 0 || save_link_state == 3) && - ((GDB_TARGET_IS_ESAME && - ((instr[0] == 0xe3) && (instr[5] == 0x24))) || - (instr[0] == 0x50)) && ((instr[2] >> 4) == 0xf)) - { - regidx = instr[1] >> 4; - offset = ((instr[2] & 0xf) << 8) + instr[3]; - if (offset == 0) - { - if (save_link_state == 3 && regidx == save_link_regidx) - { - save_link_state = 4; - valid_prologue = 1; - continue; - } - else - break; - } - if (regidx < 6) - varargs_state = 1; - expected_offset = - S390_GPR6_STACK_OFFSET + (S390_GPR_SIZE * (regidx - 6)); - if (offset != expected_offset) - { - good_prologue = 0; - break; - } - if (gprs_saved[regidx]) - { - good_prologue = 0; - break; - } - good_prologue = 1; - gprs_saved[regidx] = 1; - if (saved_regs) - { - save_reg_addr = orig_sp + offset; - saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr; - } - valid_prologue = 1; - continue; - } - - /* Check for an fp-relative STG, ST, or STM. This is probably - spilling an argument from a register out into a stack slot. - This could be a user instruction, but if we haven't included - any other suspicious instructions in the prologue, this - could only be an initializing store, which isn't too bad to - skip. The consequences of not including arg-to-stack spills - are more serious, though --- you don't see the proper values - of the arguments. */ - if ((save_link_state == 3 || save_link_state == 4) - && ((instr[0] == 0x50 /* st %rA, D(%rX,%rB) */ - && (instr[1] & 0xf) == 0 /* %rX is zero, no index reg */ - && is_arg_reg ((instr[1] >> 4) & 0xf) - && ((instr[2] >> 4) & 0xf) == frame_pointer_regidx) - || (instr[0] == 0x90 /* stm %rA, %rB, D(%rC) */ - && is_arg_reg ((instr[1] >> 4) & 0xf) - && is_arg_reg (instr[1] & 0xf) - && ((instr[2] >> 4) & 0xf) == frame_pointer_regidx))) - { - valid_prologue = 1; - continue; - } - - /* check for STD */ - if (instr[0] == 0x60 && (instr[2] >> 4) == 0xf) - { - regidx = instr[1] >> 4; - if (regidx == 0 || regidx == 2) - varargs_state = 1; - if (fprs_saved[regidx]) - { - good_prologue = 0; - break; - } - fprs_saved[regidx] = 1; - if (saved_regs) - { - save_reg_addr = orig_sp + (((instr[2] & 0xf) << 8) + instr[3]); - saved_regs[S390_FP0_REGNUM + regidx] = save_reg_addr; - } - valid_prologue = 1; - continue; - } - - - if (const_pool_state == 0) - { - - if (GDB_TARGET_IS_ESAME) - { - /* Check for larl CONST_POOL_REGIDX,offset on ESAME */ - if ((instr[0] == 0xc0) - && (instr[1] == (CONST_POOL_REGIDX << 4))) - { - const_pool_state = 2; - valid_prologue = 1; - continue; - } - } - else - { - /* Check for BASR gpr13,gpr0 used to load constant pool pointer to r13 in old compiler */ - if (instr[0] == 0xd && (instr[1] & 0xf) == 0 - && ((instr[1] >> 4) == CONST_POOL_REGIDX)) - { - const_pool_state = 1; - valid_prologue = 1; - continue; - } - } - /* Check for new fangled bras %r13,newpc to load new constant pool */ - /* embedded in code, older pre abi compilers also emitted this stuff. */ - if ((instr[0] == 0xa7) && ((instr[1] & 0xf) == 0x5) && - ((instr[1] >> 4) == CONST_POOL_REGIDX) - && ((instr[2] & 0x80) == 0)) - { - const_pool_state = 2; - test_pc += - (((((instr[2] & 0xf) << 8) + instr[3]) << 1) - instrlen); - valid_prologue = 1; - continue; - } - } - /* Check for AGHI or AHI CONST_POOL_REGIDX,val */ - if (const_pool_state == 1 && (instr[0] == 0xa7) && - ((GDB_TARGET_IS_ESAME && - (instr[1] == ((CONST_POOL_REGIDX << 4) | 0xb))) || - (instr[1] == ((CONST_POOL_REGIDX << 4) | 0xa)))) - { - const_pool_state = 2; - valid_prologue = 1; - continue; - } - /* Check for LGR or LR gprx,15 */ - if ((GDB_TARGET_IS_ESAME && - instr[0] == 0xb9 && instr[1] == 0x04 && (instr[3] & 0xf) == 0xf) || - (instr[0] == 0x18 && (instr[1] & 0xf) == 0xf)) - { - if (GDB_TARGET_IS_ESAME) - regidx = instr[3] >> 4; - else - regidx = instr[1] >> 4; - if (save_link_state == 0 && regidx != 0xb) - { - /* Almost defintely code for - decrementing the stack pointer - ( i.e. a non leaf function - or else leaf with locals ) */ - save_link_regidx = regidx; - save_link_state = 1; - valid_prologue = 1; - continue; - } - /* We use this frame pointer for alloca - unfortunately we need to assume its gpr11 - otherwise we would need a smarter prologue - walker. */ - if (!frame_pointer_found && regidx == 0xb) - { - frame_pointer_regidx = 0xb; - frame_pointer_found = 1; - if (fextra_info) - fextra_info->frame_pointer_saved_pc = test_pc; - valid_prologue = 1; - continue; - } - } - /* Check for AHI or AGHI gpr15,val */ - if (save_link_state == 1 && (instr[0] == 0xa7) && - ((GDB_TARGET_IS_ESAME && (instr[1] == 0xfb)) || (instr[1] == 0xfa))) - { - if (fextra_info) - fextra_info->stack_bought = - -extract_signed_integer (&instr[2], 2); - save_link_state = 3; - valid_prologue = 1; - continue; - } - /* Alternatively check for the complex construction for - buying more than 32k of stack - BRAS gprx,.+8 - long val - s %r15,0(%gprx) gprx currently r1 */ - if ((save_link_state == 1) && (instr[0] == 0xa7) - && ((instr[1] & 0xf) == 0x5) && (instr[2] == 0) - && (instr[3] == 0x4) && ((instr[1] >> 4) != CONST_POOL_REGIDX)) - { - subtract_sp_regidx = instr[1] >> 4; - save_link_state = 2; - if (fextra_info) - target_read_memory (test_pc + instrlen, - (char *) &fextra_info->stack_bought, - sizeof (fextra_info->stack_bought)); - test_pc += 4; - valid_prologue = 1; - continue; - } - if (save_link_state == 2 && instr[0] == 0x5b - && instr[1] == 0xf0 && - instr[2] == (subtract_sp_regidx << 4) && instr[3] == 0) - { - save_link_state = 3; - valid_prologue = 1; - continue; - } - /* check for LA gprx,offset(15) used for varargs */ - if ((instr[0] == 0x41) && ((instr[2] >> 4) == 0xf) && - ((instr[1] & 0xf) == 0)) - { - /* some code uses gpr7 to point to outgoing args */ - if (((instr[1] >> 4) == 7) && (save_link_state == 0) && - ((instr[2] & 0xf) == 0) - && (instr[3] == S390_STACK_FRAME_OVERHEAD)) - { - valid_prologue = 1; - continue; - } - if (varargs_state == 1) - { - varargs_state = 2; - valid_prologue = 1; - continue; - } - } - /* Check for a GOT load */ - - if (GDB_TARGET_IS_ESAME) - { - /* Check for larl GOT_REGIDX, on ESAME */ - if ((got_state == 0) && (instr[0] == 0xc0) - && (instr[1] == (GOT_REGIDX << 4))) - { - got_state = 2; - valid_prologue = 1; - continue; - } - } - else - { - /* check for l GOT_REGIDX,x(CONST_POOL_REGIDX) */ - if (got_state == 0 && const_pool_state == 2 && instr[0] == 0x58 - && (instr[2] == (CONST_POOL_REGIDX << 4)) - && ((instr[1] >> 4) == GOT_REGIDX)) - { - got_state = 1; - got_load_addr = test_pc; - got_load_len = instrlen; - valid_prologue = 1; - continue; - } - /* Check for subsequent ar got_regidx,basr_regidx */ - if (got_state == 1 && instr[0] == 0x1a && - instr[1] == ((GOT_REGIDX << 4) | CONST_POOL_REGIDX)) - { - got_state = 2; - valid_prologue = 1; - continue; - } - } - } - while (valid_prologue && good_prologue); - if (good_prologue) - { - /* If this function doesn't reference the global offset table, - then the compiler may use r12 for other things. If the last - instruction we saw was a load of r12 from the constant pool, - with no subsequent add to make the address PC-relative, then - the load was probably a genuine body instruction; don't treat - it as part of the prologue. */ - if (got_state == 1 - && got_load_addr + got_load_len == test_pc) - { - test_pc = got_load_addr; - instrlen = got_load_len; - } - - good_prologue = (((const_pool_state == 0) || (const_pool_state == 2)) && - ((save_link_state == 0) || (save_link_state == 4)) && - ((varargs_state == 0) || (varargs_state == 2))); - } - if (fextra_info) - { - fextra_info->good_prologue = good_prologue; - fextra_info->skip_prologue_function_start = - (good_prologue ? test_pc : pc); - } - if (saved_regs) - /* The SP's element of the saved_regs array holds the old SP, - not the address at which it is saved. */ - saved_regs[S390_SP_REGNUM] = orig_sp; - return err; -} - - -int -s390_check_function_end (CORE_ADDR pc) -{ - bfd_byte instr[S390_MAX_INSTR_SIZE]; - disassemble_info info; - int regidx, instrlen; - - info.read_memory_func = dis_asm_read_memory; - instrlen = s390_readinstruction (instr, pc, &info); - if (instrlen < 0) - return -1; - /* check for BR */ - if (instrlen != 2 || instr[0] != 07 || (instr[1] >> 4) != 0xf) - return 0; - regidx = instr[1] & 0xf; - /* Check for LMG or LG */ - instrlen = - s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 6 : 4), &info); - if (instrlen < 0) - return -1; - if (GDB_TARGET_IS_ESAME) - { - - if (instrlen != 6 || instr[0] != 0xeb || instr[5] != 0x4) - return 0; - } - else if (instrlen != 4 || instr[0] != 0x98) - { - return 0; - } - if ((instr[2] >> 4) != 0xf) - return 0; - if (regidx == 14) - return 1; - instrlen = s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 12 : 8), - &info); - if (instrlen < 0) - return -1; - if (GDB_TARGET_IS_ESAME) - { - /* Check for LG */ - if (instrlen != 6 || instr[0] != 0xe3 || instr[5] != 0x4) - return 0; - } - else - { - /* Check for L */ - if (instrlen != 4 || instr[0] != 0x58) - return 0; - } - if (instr[2] >> 4 != 0xf) - return 0; - if (instr[1] >> 4 != regidx) - return 0; - return 1; -} - -static CORE_ADDR -s390_sniff_pc_function_start (CORE_ADDR pc, struct frame_info *fi) -{ - CORE_ADDR function_start, test_function_start; - int loop_cnt, err, function_end; - struct frame_extra_info fextra_info; - function_start = get_pc_function_start (pc); - - if (function_start == 0) - { - test_function_start = pc; - if (test_function_start & 1) - return 0; /* This has to be bogus */ - loop_cnt = 0; - do - { - - err = - s390_get_frame_info (test_function_start, &fextra_info, fi, 1); - loop_cnt++; - test_function_start -= 2; - function_end = s390_check_function_end (test_function_start); - } - while (!(function_end == 1 || err || loop_cnt >= 4096 || - (fextra_info.good_prologue))); - if (fextra_info.good_prologue) - function_start = fextra_info.function_start; - else if (function_end == 1) - function_start = test_function_start; - } - return function_start; -} - - - -CORE_ADDR -s390_function_start (struct frame_info *fi) -{ - CORE_ADDR function_start = 0; - - if (fi->extra_info && fi->extra_info->initialised) - function_start = fi->extra_info->function_start; - else if (fi->pc) - function_start = get_pc_function_start (fi->pc); - return function_start; -} - - - - -int -s390_frameless_function_invocation (struct frame_info *fi) -{ - struct frame_extra_info fextra_info, *fextra_info_ptr; - int frameless = 0; - - if (fi->next == NULL) /* no may be frameless */ - { - if (fi->extra_info) - fextra_info_ptr = fi->extra_info; - else - { - fextra_info_ptr = &fextra_info; - s390_get_frame_info (s390_sniff_pc_function_start (fi->pc, fi), - fextra_info_ptr, fi, 1); - } - frameless = ((fextra_info_ptr->stack_bought == 0)); - } - return frameless; - -} - - -static int -s390_is_sigreturn (CORE_ADDR pc, struct frame_info *sighandler_fi, - CORE_ADDR *sregs, CORE_ADDR *sigcaller_pc) -{ - bfd_byte instr[S390_MAX_INSTR_SIZE]; - disassemble_info info; - int instrlen; - CORE_ADDR scontext; - int retval = 0; - CORE_ADDR orig_sp; - CORE_ADDR temp_sregs; - - scontext = temp_sregs = 0; - - info.read_memory_func = dis_asm_read_memory; - instrlen = s390_readinstruction (instr, pc, &info); - if (sigcaller_pc) - *sigcaller_pc = 0; - if (((instrlen == S390_SYSCALL_SIZE) && - (instr[0] == S390_SYSCALL_OPCODE)) && - ((instr[1] == s390_NR_sigreturn) || (instr[1] == s390_NR_rt_sigreturn))) - { - if (sighandler_fi) - { - if (s390_frameless_function_invocation (sighandler_fi)) - orig_sp = sighandler_fi->frame; - else - orig_sp = ADDR_BITS_REMOVE ((CORE_ADDR) - read_memory_integer (sighandler_fi-> - frame, - S390_GPR_SIZE)); - if (orig_sp && sigcaller_pc) - { - scontext = orig_sp + S390_SIGNAL_FRAMESIZE; - if (pc == scontext && instr[1] == s390_NR_rt_sigreturn) - { - /* We got a new style rt_signal */ - /* get address of read ucontext->uc_mcontext */ - temp_sregs = orig_sp + (GDB_TARGET_IS_ESAME ? - S390X_UC_MCONTEXT_OFFSET : - S390_UC_MCONTEXT_OFFSET); - } - else - { - /* read sigcontext->sregs */ - temp_sregs = ADDR_BITS_REMOVE ((CORE_ADDR) - read_memory_integer (scontext - + - (GDB_TARGET_IS_ESAME - ? - S390X_SIGCONTEXT_SREGS_OFFSET - : - S390_SIGCONTEXT_SREGS_OFFSET), - S390_GPR_SIZE)); - - } - /* read sigregs->psw.addr */ - *sigcaller_pc = - ADDR_BITS_REMOVE ((CORE_ADDR) - read_memory_integer (temp_sregs + - REGISTER_BYTE - (S390_PC_REGNUM), - S390_PSW_ADDR_SIZE)); - } - } - retval = 1; - } - if (sregs) - *sregs = temp_sregs; - return retval; -} - -/* - We need to do something better here but this will keep us out of trouble - for the moment. - For some reason the blockframe.c calls us with fi->next->fromleaf - so this seems of little use to us. */ -void -s390_init_frame_pc_first (int next_fromleaf, struct frame_info *fi) -{ - CORE_ADDR sigcaller_pc; - - fi->pc = 0; - if (next_fromleaf) - { - fi->pc = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM)); - /* fix signal handlers */ - } - else if (fi->next && fi->next->pc) - fi->pc = s390_frame_saved_pc_nofix (fi->next); - if (fi->pc && fi->next && fi->next->frame && - s390_is_sigreturn (fi->pc, fi->next, NULL, &sigcaller_pc)) - { - fi->pc = sigcaller_pc; - } - -} - -void -s390_init_extra_frame_info (int fromleaf, struct frame_info *fi) -{ - fi->extra_info = frame_obstack_alloc (sizeof (struct frame_extra_info)); - if (fi->pc) - s390_get_frame_info (s390_sniff_pc_function_start (fi->pc, fi), - fi->extra_info, fi, 1); - else - s390_memset_extra_info (fi->extra_info); -} - -/* If saved registers of frame FI are not known yet, read and cache them. - &FEXTRA_INFOP contains struct frame_extra_info; TDATAP can be NULL, - in which case the framedata are read. */ - -void -s390_frame_init_saved_regs (struct frame_info *fi) -{ - - int quick; - - if (fi->saved_regs == NULL) - { - /* zalloc memsets the saved regs */ - frame_saved_regs_zalloc (fi); - if (fi->pc) - { - quick = (fi->extra_info && fi->extra_info->initialised - && fi->extra_info->good_prologue); - s390_get_frame_info (quick ? fi->extra_info->function_start : - s390_sniff_pc_function_start (fi->pc, fi), - fi->extra_info, fi, !quick); - } - } -} - - - -CORE_ADDR -s390_frame_args_address (struct frame_info *fi) -{ - - /* Apparently gdb already knows gdb_args_offset itself */ - return fi->frame; -} - - -static CORE_ADDR -s390_frame_saved_pc_nofix (struct frame_info *fi) -{ - if (fi->extra_info && fi->extra_info->saved_pc_valid) - return fi->extra_info->saved_pc; - - if (deprecated_generic_find_dummy_frame (fi->pc, fi->frame)) - return generic_read_register_dummy (fi->pc, fi->frame, S390_PC_REGNUM); - - s390_frame_init_saved_regs (fi); - if (fi->extra_info) - { - fi->extra_info->saved_pc_valid = 1; - if (fi->extra_info->good_prologue - && fi->saved_regs[S390_RETADDR_REGNUM]) - fi->extra_info->saved_pc - = ADDR_BITS_REMOVE (read_memory_integer - (fi->saved_regs[S390_RETADDR_REGNUM], - S390_GPR_SIZE)); - else - fi->extra_info->saved_pc - = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM)); - return fi->extra_info->saved_pc; - } - return 0; -} - -CORE_ADDR -s390_frame_saved_pc (struct frame_info *fi) -{ - CORE_ADDR saved_pc = 0, sig_pc; - - if (fi->extra_info && fi->extra_info->sig_fixed_saved_pc_valid) - return fi->extra_info->sig_fixed_saved_pc; - saved_pc = s390_frame_saved_pc_nofix (fi); - - if (fi->extra_info) - { - fi->extra_info->sig_fixed_saved_pc_valid = 1; - if (saved_pc) - { - if (s390_is_sigreturn (saved_pc, fi, NULL, &sig_pc)) - saved_pc = sig_pc; - } - fi->extra_info->sig_fixed_saved_pc = saved_pc; - } - return saved_pc; -} - - - - -/* We want backtraces out of signal handlers so we don't - set thisframe->signal_handler_caller to 1 */ - -CORE_ADDR -s390_frame_chain (struct frame_info *thisframe) -{ - CORE_ADDR prev_fp = 0; - - if (deprecated_generic_find_dummy_frame (thisframe->pc, thisframe->frame)) - return generic_read_register_dummy (thisframe->pc, thisframe->frame, - S390_SP_REGNUM); - else - { - int sigreturn = 0; - CORE_ADDR sregs = 0; - struct frame_extra_info prev_fextra_info; - - memset (&prev_fextra_info, 0, sizeof (prev_fextra_info)); - if (thisframe->pc) - { - CORE_ADDR saved_pc, sig_pc; - - saved_pc = s390_frame_saved_pc_nofix (thisframe); - if (saved_pc) - { - if ((sigreturn = - s390_is_sigreturn (saved_pc, thisframe, &sregs, &sig_pc))) - saved_pc = sig_pc; - s390_get_frame_info (s390_sniff_pc_function_start - (saved_pc, NULL), &prev_fextra_info, NULL, - 1); - } - } - if (sigreturn) - { - /* read sigregs,regs.gprs[11 or 15] */ - prev_fp = read_memory_integer (sregs + - REGISTER_BYTE (S390_GP0_REGNUM + - (prev_fextra_info. - frame_pointer_saved_pc - ? 11 : 15)), - S390_GPR_SIZE); - thisframe->extra_info->sigcontext = sregs; - } - else - { - if (thisframe->saved_regs) - { - int regno; - - if (prev_fextra_info.frame_pointer_saved_pc - && thisframe->saved_regs[S390_FRAME_REGNUM]) - regno = S390_FRAME_REGNUM; - else - regno = S390_SP_REGNUM; - - if (thisframe->saved_regs[regno]) - { - /* The SP's entry of `saved_regs' is special. */ - if (regno == S390_SP_REGNUM) - prev_fp = thisframe->saved_regs[regno]; - else - prev_fp = - read_memory_integer (thisframe->saved_regs[regno], - S390_GPR_SIZE); - } - } - } - } - return ADDR_BITS_REMOVE (prev_fp); -} - -/* - Whether struct frame_extra_info is actually needed I'll have to figure - out as our frames are similar to rs6000 there is a possibility - i386 dosen't need it. */ - - - -/* a given return value in `regbuf' with a type `valtype', extract and copy its - value into `valbuf' */ -void -s390_extract_return_value (struct type *valtype, char *regbuf, char *valbuf) -{ - /* floats and doubles are returned in fpr0. fpr's have a size of 8 bytes. - We need to truncate the return value into float size (4 byte) if - necessary. */ - int len = TYPE_LENGTH (valtype); - - if (TYPE_CODE (valtype) == TYPE_CODE_FLT) - memcpy (valbuf, ®buf[REGISTER_BYTE (S390_FP0_REGNUM)], len); - else - { - int offset = 0; - /* return value is copied starting from r2. */ - if (TYPE_LENGTH (valtype) < S390_GPR_SIZE) - offset = S390_GPR_SIZE - TYPE_LENGTH (valtype); - memcpy (valbuf, - regbuf + REGISTER_BYTE (S390_GP0_REGNUM + 2) + offset, - TYPE_LENGTH (valtype)); - } -} - - -static char * -s390_promote_integer_argument (struct type *valtype, char *valbuf, - char *reg_buff, int *arglen) -{ - char *value = valbuf; - int len = TYPE_LENGTH (valtype); - - if (len < S390_GPR_SIZE) - { - /* We need to upgrade this value to a register to pass it correctly */ - int idx, diff = S390_GPR_SIZE - len, negative = - (!TYPE_UNSIGNED (valtype) && value[0] & 0x80); - for (idx = 0; idx < S390_GPR_SIZE; idx++) - { - reg_buff[idx] = (idx < diff ? (negative ? 0xff : 0x0) : - value[idx - diff]); - } - value = reg_buff; - *arglen = S390_GPR_SIZE; - } - else - { - if (len & (S390_GPR_SIZE - 1)) - { - fprintf_unfiltered (gdb_stderr, - "s390_promote_integer_argument detected an argument not " - "a multiple of S390_GPR_SIZE & greater than S390_GPR_SIZE " - "we might not deal with this correctly.\n"); - } - *arglen = len; - } - - return (value); -} - -void -s390_store_return_value (struct type *valtype, char *valbuf) -{ - int arglen; - char *reg_buff = alloca (max (S390_FPR_SIZE, REGISTER_SIZE)), *value; - - if (TYPE_CODE (valtype) == TYPE_CODE_FLT) - { - if (TYPE_LENGTH (valtype) == 4 - || TYPE_LENGTH (valtype) == 8) - write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM), valbuf, - TYPE_LENGTH (valtype)); - else - error ("GDB is unable to return `long double' values " - "on this architecture."); - } - else - { - value = - s390_promote_integer_argument (valtype, valbuf, reg_buff, &arglen); - /* Everything else is returned in GPR2 and up. */ - write_register_bytes (REGISTER_BYTE (S390_GP0_REGNUM + 2), value, - arglen); - } -} -static int -gdb_print_insn_s390 (bfd_vma memaddr, disassemble_info * info) -{ - bfd_byte instrbuff[S390_MAX_INSTR_SIZE]; - int instrlen, cnt; - - instrlen = s390_readinstruction (instrbuff, (CORE_ADDR) memaddr, info); - if (instrlen < 0) - { - (*info->memory_error_func) (instrlen, memaddr, info); - return -1; - } - for (cnt = 0; cnt < instrlen; cnt++) - info->fprintf_func (info->stream, "%02X ", instrbuff[cnt]); - for (cnt = instrlen; cnt < S390_MAX_INSTR_SIZE; cnt++) - info->fprintf_func (info->stream, " "); - instrlen = print_insn_s390 (memaddr, info); - return instrlen; -} - - - -/* Not the most efficent code in the world */ -int -s390_fp_regnum (void) -{ - int regno = S390_SP_REGNUM; - struct frame_extra_info fextra_info; - - CORE_ADDR pc = ADDR_BITS_REMOVE (read_register (S390_PC_REGNUM)); - - s390_get_frame_info (s390_sniff_pc_function_start (pc, NULL), &fextra_info, - NULL, 1); - if (fextra_info.frame_pointer_saved_pc) - regno = S390_FRAME_REGNUM; - return regno; -} - -CORE_ADDR -s390_read_fp (void) -{ - return read_register (s390_fp_regnum ()); -} - - -static void -s390_pop_frame_regular (struct frame_info *frame) -{ - int regnum; - - write_register (S390_PC_REGNUM, FRAME_SAVED_PC (frame)); - - /* Restore any saved registers. */ - if (frame->saved_regs) - { - for (regnum = 0; regnum < NUM_REGS; regnum++) - if (frame->saved_regs[regnum] != 0) - { - ULONGEST value; - - value = read_memory_unsigned_integer (frame->saved_regs[regnum], - REGISTER_RAW_SIZE (regnum)); - write_register (regnum, value); - } - - /* Actually cut back the stack. Remember that the SP's element of - saved_regs is the old SP itself, not the address at which it is - saved. */ - write_register (S390_SP_REGNUM, frame->saved_regs[S390_SP_REGNUM]); - } - - /* Throw away any cached frame information. */ - flush_cached_frames (); -} - - -/* Destroy the innermost (Top-Of-Stack) stack frame, restoring the - machine state that was in effect before the frame was created. - Used in the contexts of the "return" command, and of - target function calls from the debugger. */ -void -s390_pop_frame (void) -{ - /* This function checks for and handles generic dummy frames, and - calls back to our function for ordinary frames. */ - generic_pop_current_frame (s390_pop_frame_regular); -} - - -/* Return non-zero if TYPE is an integer-like type, zero otherwise. - "Integer-like" types are those that should be passed the way - integers are: integers, enums, ranges, characters, and booleans. */ -static int -is_integer_like (struct type *type) -{ - enum type_code code = TYPE_CODE (type); - - return (code == TYPE_CODE_INT - || code == TYPE_CODE_ENUM - || code == TYPE_CODE_RANGE - || code == TYPE_CODE_CHAR - || code == TYPE_CODE_BOOL); -} - - -/* Return non-zero if TYPE is a pointer-like type, zero otherwise. - "Pointer-like" types are those that should be passed the way - pointers are: pointers and references. */ -static int -is_pointer_like (struct type *type) -{ - enum type_code code = TYPE_CODE (type); - - return (code == TYPE_CODE_PTR - || code == TYPE_CODE_REF); -} - - -/* Return non-zero if TYPE is a `float singleton' or `double - singleton', zero otherwise. - - A `T singleton' is a struct type with one member, whose type is - either T or a `T singleton'. So, the following are all float - singletons: - - struct { float x }; - struct { struct { float x; } x; }; - struct { struct { struct { float x; } x; } x; }; - - ... and so on. - - WHY THE HECK DO WE CARE ABOUT THIS??? Well, it turns out that GCC - passes all float singletons and double singletons as if they were - simply floats or doubles. This is *not* what the ABI says it - should do. */ -static int -is_float_singleton (struct type *type) -{ - return (TYPE_CODE (type) == TYPE_CODE_STRUCT - && TYPE_NFIELDS (type) == 1 - && (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_FLT - || is_float_singleton (TYPE_FIELD_TYPE (type, 0)))); -} - - -/* Return non-zero if TYPE is a struct-like type, zero otherwise. - "Struct-like" types are those that should be passed as structs are: - structs and unions. - - As an odd quirk, not mentioned in the ABI, GCC passes float and - double singletons as if they were a plain float, double, etc. (The - corresponding union types are handled normally.) So we exclude - those types here. *shrug* */ -static int -is_struct_like (struct type *type) -{ - enum type_code code = TYPE_CODE (type); - - return (code == TYPE_CODE_UNION - || (code == TYPE_CODE_STRUCT && ! is_float_singleton (type))); -} - - -/* Return non-zero if TYPE is a float-like type, zero otherwise. - "Float-like" types are those that should be passed as - floating-point values are. - - You'd think this would just be floats, doubles, long doubles, etc. - But as an odd quirk, not mentioned in the ABI, GCC passes float and - double singletons as if they were a plain float, double, etc. (The - corresponding union types are handled normally.) So we exclude - those types here. *shrug* */ -static int -is_float_like (struct type *type) -{ - return (TYPE_CODE (type) == TYPE_CODE_FLT - || is_float_singleton (type)); -} - - -/* Return non-zero if TYPE is considered a `DOUBLE_OR_FLOAT', as - defined by the parameter passing conventions described in the - "GNU/Linux for S/390 ELF Application Binary Interface Supplement". - Otherwise, return zero. */ -static int -is_double_or_float (struct type *type) -{ - return (is_float_like (type) - && (TYPE_LENGTH (type) == 4 - || TYPE_LENGTH (type) == 8)); -} - - -/* Return non-zero if TYPE is considered a `SIMPLE_ARG', as defined by - the parameter passing conventions described in the "GNU/Linux for - S/390 ELF Application Binary Interface Supplement". Return zero - otherwise. */ -static int -is_simple_arg (struct type *type) -{ - unsigned length = TYPE_LENGTH (type); - - /* This is almost a direct translation of the ABI's language, except - that we have to exclude 8-byte structs; those are DOUBLE_ARGs. */ - return ((is_integer_like (type) && length <= 4) - || is_pointer_like (type) - || (is_struct_like (type) && length != 8) - || (is_float_like (type) && length == 16)); -} - - -/* Return non-zero if TYPE should be passed as a pointer to a copy, - zero otherwise. TYPE must be a SIMPLE_ARG, as recognized by - `is_simple_arg'. */ -static int -pass_by_copy_ref (struct type *type) -{ - unsigned length = TYPE_LENGTH (type); - - return ((is_struct_like (type) && length != 1 && length != 2 && length != 4) - || (is_float_like (type) && length == 16)); -} - - -/* Return ARG, a `SIMPLE_ARG', sign-extended or zero-extended to a full - word as required for the ABI. */ -static LONGEST -extend_simple_arg (struct value *arg) -{ - struct type *type = VALUE_TYPE (arg); - - /* Even structs get passed in the least significant bits of the - register / memory word. It's not really right to extract them as - an integer, but it does take care of the extension. */ - if (TYPE_UNSIGNED (type)) - return extract_unsigned_integer (VALUE_CONTENTS (arg), - TYPE_LENGTH (type)); - else - return extract_signed_integer (VALUE_CONTENTS (arg), - TYPE_LENGTH (type)); -} - - -/* Return non-zero if TYPE is a `DOUBLE_ARG', as defined by the - parameter passing conventions described in the "GNU/Linux for S/390 - ELF Application Binary Interface Supplement". Return zero - otherwise. */ -static int -is_double_arg (struct type *type) -{ - unsigned length = TYPE_LENGTH (type); - - return ((is_integer_like (type) - || is_struct_like (type)) - && length == 8); -} - - -/* Round ADDR up to the next N-byte boundary. N must be a power of - two. */ -static CORE_ADDR -round_up (CORE_ADDR addr, int n) -{ - /* Check that N is really a power of two. */ - gdb_assert (n && (n & (n-1)) == 0); - return ((addr + n - 1) & -n); -} - - -/* Round ADDR down to the next N-byte boundary. N must be a power of - two. */ -static CORE_ADDR -round_down (CORE_ADDR addr, int n) -{ - /* Check that N is really a power of two. */ - gdb_assert (n && (n & (n-1)) == 0); - return (addr & -n); -} - - -/* Return the alignment required by TYPE. */ -static int -alignment_of (struct type *type) -{ - int alignment; - - if (is_integer_like (type) - || is_pointer_like (type) - || TYPE_CODE (type) == TYPE_CODE_FLT) - alignment = TYPE_LENGTH (type); - else if (TYPE_CODE (type) == TYPE_CODE_STRUCT - || TYPE_CODE (type) == TYPE_CODE_UNION) - { - int i; - - alignment = 1; - for (i = 0; i < TYPE_NFIELDS (type); i++) - { - int field_alignment = alignment_of (TYPE_FIELD_TYPE (type, i)); - - if (field_alignment > alignment) - alignment = field_alignment; - } - } - else - alignment = 1; - - /* Check that everything we ever return is a power of two. Lots of - code doesn't want to deal with aligning things to arbitrary - boundaries. */ - gdb_assert ((alignment & (alignment - 1)) == 0); - - return alignment; -} - - -/* Put the actual parameter values pointed to by ARGS[0..NARGS-1] in - place to be passed to a function, as specified by the "GNU/Linux - for S/390 ELF Application Binary Interface Supplement". - - SP is the current stack pointer. We must put arguments, links, - padding, etc. whereever they belong, and return the new stack - pointer value. - - If STRUCT_RETURN is non-zero, then the function we're calling is - going to return a structure by value; STRUCT_ADDR is the address of - a block we've allocated for it on the stack. - - Our caller has taken care of any type promotions needed to satisfy - prototypes or the old K&R argument-passing rules. */ -CORE_ADDR -s390_push_arguments (int nargs, struct value **args, CORE_ADDR sp, - int struct_return, CORE_ADDR struct_addr) -{ - int i; - int pointer_size = (TARGET_PTR_BIT / TARGET_CHAR_BIT); - - /* The number of arguments passed by reference-to-copy. */ - int num_copies; - - /* If the i'th argument is passed as a reference to a copy, then - copy_addr[i] is the address of the copy we made. */ - CORE_ADDR *copy_addr = alloca (nargs * sizeof (CORE_ADDR)); - - /* Build the reference-to-copy area. */ - num_copies = 0; - for (i = 0; i < nargs; i++) - { - struct value *arg = args[i]; - struct type *type = VALUE_TYPE (arg); - unsigned length = TYPE_LENGTH (type); - - if (is_simple_arg (type) - && pass_by_copy_ref (type)) - { - sp -= length; - sp = round_down (sp, alignment_of (type)); - write_memory (sp, VALUE_CONTENTS (arg), length); - copy_addr[i] = sp; - num_copies++; - } - } - - /* Reserve space for the parameter area. As a conservative - simplification, we assume that everything will be passed on the - stack. */ - { - int i; - - for (i = 0; i < nargs; i++) - { - struct value *arg = args[i]; - struct type *type = VALUE_TYPE (arg); - int length = TYPE_LENGTH (type); - - sp = round_down (sp, alignment_of (type)); - - /* SIMPLE_ARG values get extended to 32 bits. Assume every - argument is. */ - if (length < 4) length = 4; - sp -= length; - } - } - - /* Include space for any reference-to-copy pointers. */ - sp = round_down (sp, pointer_size); - sp -= num_copies * pointer_size; - - /* After all that, make sure it's still aligned on an eight-byte - boundary. */ - sp = round_down (sp, 8); - - /* Finally, place the actual parameters, working from SP towards - higher addresses. The code above is supposed to reserve enough - space for this. */ - { - int fr = 0; - int gr = 2; - CORE_ADDR starg = sp; - - for (i = 0; i < nargs; i++) - { - struct value *arg = args[i]; - struct type *type = VALUE_TYPE (arg); - - if (is_double_or_float (type) - && fr <= 2) - { - /* When we store a single-precision value in an FP register, - it occupies the leftmost bits. */ - write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM + fr), - VALUE_CONTENTS (arg), - TYPE_LENGTH (type)); - fr += 2; - } - else if (is_simple_arg (type) - && gr <= 6) - { - /* Do we need to pass a pointer to our copy of this - argument? */ - if (pass_by_copy_ref (type)) - write_register (S390_GP0_REGNUM + gr, copy_addr[i]); - else - write_register (S390_GP0_REGNUM + gr, extend_simple_arg (arg)); - - gr++; - } - else if (is_double_arg (type) - && gr <= 5) - { - write_register_gen (S390_GP0_REGNUM + gr, - VALUE_CONTENTS (arg)); - write_register_gen (S390_GP0_REGNUM + gr + 1, - VALUE_CONTENTS (arg) + 4); - gr += 2; - } - else - { - /* The `OTHER' case. */ - enum type_code code = TYPE_CODE (type); - unsigned length = TYPE_LENGTH (type); - - /* If we skipped r6 because we couldn't fit a DOUBLE_ARG - in it, then don't go back and use it again later. */ - if (is_double_arg (type) && gr == 6) - gr = 7; - - if (is_simple_arg (type)) - { - /* Simple args are always either extended to 32 bits, - or pointers. */ - starg = round_up (starg, 4); - - /* Do we need to pass a pointer to our copy of this - argument? */ - if (pass_by_copy_ref (type)) - write_memory_signed_integer (starg, pointer_size, - copy_addr[i]); - else - /* Simple args are always extended to 32 bits. */ - write_memory_signed_integer (starg, 4, - extend_simple_arg (arg)); - starg += 4; - } - else - { - /* You'd think we should say: - starg = round_up (starg, alignment_of (type)); - Unfortunately, GCC seems to simply align the stack on - a four-byte boundary, even when passing doubles. */ - starg = round_up (starg, 4); - write_memory (starg, VALUE_CONTENTS (arg), length); - starg += length; - } - } - } - } - - /* Allocate the standard frame areas: the register save area, the - word reserved for the compiler (which seems kind of meaningless), - and the back chain pointer. */ - sp -= 96; - - /* Write the back chain pointer into the first word of the stack - frame. This will help us get backtraces from within functions - called from GDB. */ - write_memory_unsigned_integer (sp, (TARGET_PTR_BIT / TARGET_CHAR_BIT), - read_fp ()); - - return sp; -} - - -static int -s390_use_struct_convention (int gcc_p, struct type *value_type) -{ - enum type_code code = TYPE_CODE (value_type); - - return (code == TYPE_CODE_STRUCT - || code == TYPE_CODE_UNION); -} - - -/* Return the GDB type object for the "standard" data type - of data in register N. */ -struct type * -s390_register_virtual_type (int regno) -{ - if (S390_FP0_REGNUM <= regno && regno < S390_FP0_REGNUM + S390_NUM_FPRS) - return builtin_type_double; - else - return builtin_type_int; -} - - -struct type * -s390x_register_virtual_type (int regno) -{ - return (regno == S390_FPC_REGNUM) || - (regno >= S390_FIRST_ACR && regno <= S390_LAST_ACR) ? builtin_type_int : - (regno >= S390_FP0_REGNUM) ? builtin_type_double : builtin_type_long; -} - - - -void -s390_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) -{ - write_register (S390_GP0_REGNUM + 2, addr); -} - - - -const static unsigned char * -s390_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) -{ - static unsigned char breakpoint[] = { 0x0, 0x1 }; - - *lenptr = sizeof (breakpoint); - return breakpoint; -} - -/* Advance PC across any function entry prologue instructions to reach some - "real" code. */ -CORE_ADDR -s390_skip_prologue (CORE_ADDR pc) -{ - struct frame_extra_info fextra_info; - - s390_get_frame_info (pc, &fextra_info, NULL, 1); - return fextra_info.skip_prologue_function_start; -} - -/* Immediately after a function call, return the saved pc. - Can't go through the frames for this because on some machines - the new frame is not set up until the new function executes - some instructions. */ -CORE_ADDR -s390_saved_pc_after_call (struct frame_info *frame) -{ - return ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM)); -} - -static CORE_ADDR -s390_addr_bits_remove (CORE_ADDR addr) -{ - return (addr) & 0x7fffffff; -} - - -static CORE_ADDR -s390_push_return_address (CORE_ADDR pc, CORE_ADDR sp) -{ - write_register (S390_RETADDR_REGNUM, CALL_DUMMY_ADDRESS ()); - return sp; -} - -struct gdbarch * -s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) -{ - static LONGEST s390_call_dummy_words[] = { 0 }; - struct gdbarch *gdbarch; - struct gdbarch_tdep *tdep; - int elf_flags; - - /* First see if there is already a gdbarch that can satisfy the request. */ - arches = gdbarch_list_lookup_by_info (arches, &info); - if (arches != NULL) - return arches->gdbarch; - - /* None found: is the request for a s390 architecture? */ - if (info.bfd_arch_info->arch != bfd_arch_s390) - return NULL; /* No; then it's not for us. */ - - /* Yes: create a new gdbarch for the specified machine type. */ - gdbarch = gdbarch_alloc (&info, NULL); - - set_gdbarch_believe_pcc_promotion (gdbarch, 0); - set_gdbarch_char_signed (gdbarch, 0); - - set_gdbarch_frame_args_skip (gdbarch, 0); - set_gdbarch_frame_args_address (gdbarch, s390_frame_args_address); - set_gdbarch_frame_chain (gdbarch, s390_frame_chain); - set_gdbarch_frame_init_saved_regs (gdbarch, s390_frame_init_saved_regs); - set_gdbarch_frame_locals_address (gdbarch, s390_frame_args_address); - /* We can't do this */ - set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); - set_gdbarch_store_struct_return (gdbarch, s390_store_struct_return); - set_gdbarch_deprecated_extract_return_value (gdbarch, s390_extract_return_value); - set_gdbarch_deprecated_store_return_value (gdbarch, s390_store_return_value); - /* Amount PC must be decremented by after a breakpoint. - This is often the number of bytes in BREAKPOINT - but not always. */ - set_gdbarch_decr_pc_after_break (gdbarch, 2); - set_gdbarch_pop_frame (gdbarch, s390_pop_frame); - /* Stack grows downward. */ - set_gdbarch_inner_than (gdbarch, core_addr_lessthan); - /* Offset from address of function to start of its code. - Zero on most machines. */ - set_gdbarch_function_start_offset (gdbarch, 0); - set_gdbarch_max_register_raw_size (gdbarch, 8); - set_gdbarch_max_register_virtual_size (gdbarch, 8); - set_gdbarch_breakpoint_from_pc (gdbarch, s390_breakpoint_from_pc); - set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue); - set_gdbarch_init_extra_frame_info (gdbarch, s390_init_extra_frame_info); - set_gdbarch_init_frame_pc_first (gdbarch, s390_init_frame_pc_first); - set_gdbarch_read_fp (gdbarch, s390_read_fp); - /* This function that tells us whether the function invocation represented - by FI does not have a frame on the stack associated with it. If it - does not, FRAMELESS is set to 1, else 0. */ - set_gdbarch_frameless_function_invocation (gdbarch, - s390_frameless_function_invocation); - /* Return saved PC from a frame */ - set_gdbarch_frame_saved_pc (gdbarch, s390_frame_saved_pc); - /* FRAME_CHAIN takes a frame's nominal address - and produces the frame's chain-pointer. */ - set_gdbarch_frame_chain (gdbarch, s390_frame_chain); - set_gdbarch_saved_pc_after_call (gdbarch, s390_saved_pc_after_call); - set_gdbarch_register_byte (gdbarch, s390_register_byte); - set_gdbarch_pc_regnum (gdbarch, S390_PC_REGNUM); - set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM); - set_gdbarch_fp_regnum (gdbarch, S390_FP_REGNUM); - set_gdbarch_fp0_regnum (gdbarch, S390_FP0_REGNUM); - set_gdbarch_num_regs (gdbarch, S390_NUM_REGS); - set_gdbarch_cannot_fetch_register (gdbarch, s390_cannot_fetch_register); - set_gdbarch_cannot_store_register (gdbarch, s390_cannot_fetch_register); - set_gdbarch_get_saved_register (gdbarch, generic_unwind_get_saved_register); - set_gdbarch_use_struct_convention (gdbarch, s390_use_struct_convention); - set_gdbarch_frame_chain_valid (gdbarch, func_frame_chain_valid); - set_gdbarch_register_name (gdbarch, s390_register_name); - set_gdbarch_stab_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum); - set_gdbarch_dwarf_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum); - set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum); - set_gdbarch_deprecated_extract_struct_value_address - (gdbarch, generic_cannot_extract_struct_value_address); - - /* Parameters for inferior function calls. */ - set_gdbarch_call_dummy_p (gdbarch, 1); - set_gdbarch_use_generic_dummy_frames (gdbarch, 1); - set_gdbarch_call_dummy_length (gdbarch, 0); - set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT); - set_gdbarch_call_dummy_address (gdbarch, entry_point_address); - set_gdbarch_call_dummy_start_offset (gdbarch, 0); - set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_at_entry_point); - set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame); - set_gdbarch_push_arguments (gdbarch, s390_push_arguments); - set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos); - set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); - set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0); - set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); - set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy); - set_gdbarch_push_return_address (gdbarch, s390_push_return_address); - set_gdbarch_sizeof_call_dummy_words (gdbarch, - sizeof (s390_call_dummy_words)); - set_gdbarch_call_dummy_words (gdbarch, s390_call_dummy_words); - set_gdbarch_coerce_float_to_double (gdbarch, - standard_coerce_float_to_double); - - switch (info.bfd_arch_info->mach) - { - case bfd_mach_s390_31: - set_gdbarch_register_size (gdbarch, 4); - set_gdbarch_register_raw_size (gdbarch, s390_register_raw_size); - set_gdbarch_register_virtual_size (gdbarch, s390_register_raw_size); - set_gdbarch_register_virtual_type (gdbarch, s390_register_virtual_type); - - set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove); - set_gdbarch_register_bytes (gdbarch, S390_REGISTER_BYTES); - break; - case bfd_mach_s390_64: - set_gdbarch_register_size (gdbarch, 8); - set_gdbarch_register_raw_size (gdbarch, s390x_register_raw_size); - set_gdbarch_register_virtual_size (gdbarch, s390x_register_raw_size); - set_gdbarch_register_virtual_type (gdbarch, - s390x_register_virtual_type); - - set_gdbarch_long_bit (gdbarch, 64); - set_gdbarch_long_long_bit (gdbarch, 64); - set_gdbarch_ptr_bit (gdbarch, 64); - set_gdbarch_register_bytes (gdbarch, S390X_REGISTER_BYTES); - break; - } - - return gdbarch; -} - - - -void -_initialize_s390_tdep (void) -{ - - /* Hook us into the gdbarch mechanism. */ - register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init); - if (!tm_print_insn) /* Someone may have already set it */ - tm_print_insn = gdb_print_insn_s390; -} - -#endif /* GDBSERVER */ |