/* Target-dependent code for GDB, the GNU debugger. Copyright 2001, 2002, 2003 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 #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 && get_frame_base (fi)) { orig_sp = get_frame_base (fi); if (! init_extra_info && fextra_info->initialised) orig_sp += fextra_info->stack_bought; saved_regs = get_frame_saved_regs (fi); } 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 && get_next_frame (fi) && get_frame_extra_info (get_next_frame (fi)) && get_frame_extra_info (get_next_frame (fi))->sigcontext) { /* We are backtracing from a signal handler */ save_reg_addr = get_frame_extra_info (get_next_frame (fi))->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 = get_frame_extra_info (get_next_frame (fi))->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 (get_frame_extra_info (fi) && get_frame_extra_info (fi)->initialised) function_start = get_frame_extra_info (fi)->function_start; else if (get_frame_pc (fi)) function_start = get_frame_func (fi); 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 (get_next_frame (fi) == NULL) /* no may be frameless */ { if (get_frame_extra_info (fi)) fextra_info_ptr = get_frame_extra_info (fi); else { fextra_info_ptr = &fextra_info; s390_get_frame_info (s390_sniff_pc_function_start (get_frame_pc (fi), 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 = get_frame_base (sighandler_fi); else orig_sp = ADDR_BITS_REMOVE ((CORE_ADDR) read_memory_integer (get_frame_base (sighandler_fi), 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. */ CORE_ADDR s390_init_frame_pc_first (int next_fromleaf, struct frame_info *fi) { CORE_ADDR sigcaller_pc; CORE_ADDR pc = 0; if (next_fromleaf) { pc = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM)); /* fix signal handlers */ } else if (get_next_frame (fi) && get_frame_pc (get_next_frame (fi))) pc = s390_frame_saved_pc_nofix (get_next_frame (fi)); if (pc && get_next_frame (fi) && get_frame_base (get_next_frame (fi)) && s390_is_sigreturn (pc, get_next_frame (fi), NULL, &sigcaller_pc)) { pc = sigcaller_pc; } return pc; } void s390_init_extra_frame_info (int fromleaf, struct frame_info *fi) { frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info)); if (get_frame_pc (fi)) s390_get_frame_info (s390_sniff_pc_function_start (get_frame_pc (fi), fi), get_frame_extra_info (fi), fi, 1); else s390_memset_extra_info (get_frame_extra_info (fi)); } /* 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 (get_frame_saved_regs (fi) == NULL) { /* zalloc memsets the saved regs */ frame_saved_regs_zalloc (fi); if (get_frame_pc (fi)) { quick = (get_frame_extra_info (fi) && get_frame_extra_info (fi)->initialised && get_frame_extra_info (fi)->good_prologue); s390_get_frame_info (quick ? get_frame_extra_info (fi)->function_start : s390_sniff_pc_function_start (get_frame_pc (fi), fi), get_frame_extra_info (fi), fi, !quick); } } } CORE_ADDR s390_frame_args_address (struct frame_info *fi) { /* Apparently gdb already knows gdb_args_offset itself */ return get_frame_base (fi); } static CORE_ADDR s390_frame_saved_pc_nofix (struct frame_info *fi) { if (get_frame_extra_info (fi) && get_frame_extra_info (fi)->saved_pc_valid) return get_frame_extra_info (fi)->saved_pc; if (deprecated_generic_find_dummy_frame (get_frame_pc (fi), get_frame_base (fi))) return deprecated_read_register_dummy (get_frame_pc (fi), get_frame_base (fi), S390_PC_REGNUM); s390_frame_init_saved_regs (fi); if (get_frame_extra_info (fi)) { get_frame_extra_info (fi)->saved_pc_valid = 1; if (get_frame_extra_info (fi)->good_prologue && get_frame_saved_regs (fi)[S390_RETADDR_REGNUM]) get_frame_extra_info (fi)->saved_pc = ADDR_BITS_REMOVE (read_memory_integer (get_frame_saved_regs (fi)[S390_RETADDR_REGNUM], S390_GPR_SIZE)); else get_frame_extra_info (fi)->saved_pc = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM)); return get_frame_extra_info (fi)->saved_pc; } return 0; } CORE_ADDR s390_frame_saved_pc (struct frame_info *fi) { CORE_ADDR saved_pc = 0, sig_pc; if (get_frame_extra_info (fi) && get_frame_extra_info (fi)->sig_fixed_saved_pc_valid) return get_frame_extra_info (fi)->sig_fixed_saved_pc; saved_pc = s390_frame_saved_pc_nofix (fi); if (get_frame_extra_info (fi)) { get_frame_extra_info (fi)->sig_fixed_saved_pc_valid = 1; if (saved_pc) { if (s390_is_sigreturn (saved_pc, fi, NULL, &sig_pc)) saved_pc = sig_pc; } get_frame_extra_info (fi)->sig_fixed_saved_pc = saved_pc; } return saved_pc; } /* We want backtraces out of signal handlers so we don't set (get_frame_type (thisframe) == SIGTRAMP_FRAME) to 1 */ CORE_ADDR s390_frame_chain (struct frame_info *thisframe) { CORE_ADDR prev_fp = 0; if (deprecated_generic_find_dummy_frame (get_frame_pc (thisframe), get_frame_base (thisframe))) return deprecated_read_register_dummy (get_frame_pc (thisframe), get_frame_base (thisframe), 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 (get_frame_pc (thisframe)) { 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); get_frame_extra_info (thisframe)->sigcontext = sregs; } else { if (get_frame_saved_regs (thisframe)) { int regno; if (prev_fextra_info.frame_pointer_saved_pc && get_frame_saved_regs (thisframe)[S390_FRAME_REGNUM]) regno = S390_FRAME_REGNUM; else regno = S390_SP_REGNUM; if (get_frame_saved_regs (thisframe)[regno]) { /* The SP's entry of `saved_regs' is special. */ if (regno == S390_SP_REGNUM) prev_fp = get_frame_saved_regs (thisframe)[regno]; else prev_fp = read_memory_integer (get_frame_saved_regs (thisframe)[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) deprecated_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. */ deprecated_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, DEPRECATED_FRAME_SAVED_PC (frame)); /* Restore any saved registers. */ if (get_frame_saved_regs (frame)) { for (regnum = 0; regnum < NUM_REGS; regnum++) if (get_frame_saved_regs (frame)[regnum] != 0) { ULONGEST value; value = read_memory_unsigned_integer (get_frame_saved_regs (frame)[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, get_frame_saved_regs (frame)[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. */ deprecated_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) { deprecated_write_register_gen (S390_GP0_REGNUM + gr, VALUE_CONTENTS (arg)); deprecated_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; } static int s390_address_class_type_flags (int byte_size, int dwarf2_addr_class) { if (byte_size == 4) return TYPE_FLAG_ADDRESS_CLASS_1; else return 0; } static const char * s390_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags) { if (type_flags & TYPE_FLAG_ADDRESS_CLASS_1) return "mode32"; else return NULL; } int s390_address_class_name_to_type_flags (struct gdbarch *gdbarch, const char *name, int *type_flags_ptr) { if (strcmp (name, "mode32") == 0) { *type_flags_ptr = TYPE_FLAG_ADDRESS_CLASS_1; return 1; } else return 0; } 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); /* NOTE: cagney/2002-12-06: This can be deleted when this arch is ready to unwind the PC first (see frame.c:get_prev_frame()). */ set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default); 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_deprecated_frame_chain (gdbarch, s390_frame_chain); set_gdbarch_deprecated_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_deprecated_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_deprecated_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_deprecated_max_register_raw_size (gdbarch, 8); set_gdbarch_deprecated_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_deprecated_init_extra_frame_info (gdbarch, s390_init_extra_frame_info); set_gdbarch_deprecated_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_deprecated_frame_saved_pc (gdbarch, s390_frame_saved_pc); /* DEPRECATED_FRAME_CHAIN takes a frame's nominal address and produces the frame's chain-pointer. */ set_gdbarch_deprecated_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_use_struct_convention (gdbarch, s390_use_struct_convention); 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_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point); set_gdbarch_deprecated_push_arguments (gdbarch, s390_push_arguments); set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos); set_gdbarch_sizeof_call_dummy_words (gdbarch, sizeof (s390_call_dummy_words)); set_gdbarch_call_dummy_words (gdbarch, s390_call_dummy_words); 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); set_gdbarch_address_class_type_flags (gdbarch, s390_address_class_type_flags); set_gdbarch_address_class_type_flags_to_name (gdbarch, s390_address_class_type_flags_to_name); set_gdbarch_address_class_name_to_type_flags (gdbarch, s390_address_class_name_to_type_flags); break; } /* Should be using push_dummy_call. */ set_gdbarch_deprecated_dummy_write_sp (gdbarch, generic_target_write_sp); 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 */