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Diffstat (limited to 'libgloss/sparc/erc32-stub.c')
| -rw-r--r-- | libgloss/sparc/erc32-stub.c | 363 |
1 files changed, 0 insertions, 363 deletions
diff --git a/libgloss/sparc/erc32-stub.c b/libgloss/sparc/erc32-stub.c deleted file mode 100644 index 71a65b2..0000000 --- a/libgloss/sparc/erc32-stub.c +++ /dev/null @@ -1,363 +0,0 @@ -/* - * Copyright (c) 1996 Cygnus Support - * - * The authors hereby grant permission to use, copy, modify, distribute, - * and license this software and its documentation for any purpose, provided - * that existing copyright notices are retained in all copies and that this - * notice is included verbatim in any distributions. No written agreement, - * license, or royalty fee is required for any of the authorized uses. - * Modifications to this software may be copyrighted by their authors - * and need not follow the licensing terms described here, provided that - * the new terms are clearly indicated on the first page of each file where - * they apply. - */ - -#include <string.h> -#include <signal.h> -#include "debug.h" -#include "asm.h" -#include "slite.h" - -extern unsigned long rdtbr(); -extern struct trap_entry fltr_proto; -extern void trap_low(); -exception_t default_trap_hook = trap_low; -void target_reset(); -void flush_i_cache(); -char *target_read_registers(unsigned long *); -char *target_write_registers(unsigned long *); -char *target_dump_state(unsigned long *); - -#define NUMREGS 72 - -/* Number of bytes of registers. */ -#define NUMREGBYTES (NUMREGS * 4) - -enum regnames {G0, G1, G2, G3, G4, G5, G6, G7, - O0, O1, O2, O3, O4, O5, SP, O7, - L0, L1, L2, L3, L4, L5, L6, L7, - I0, I1, I2, I3, I4, I5, FP, I7, - - F0, F1, F2, F3, F4, F5, F6, F7, - F8, F9, F10, F11, F12, F13, F14, F15, - F16, F17, F18, F19, F20, F21, F22, F23, - F24, F25, F26, F27, F28, F29, F30, F31, - Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR }; - -/* - * Each entry in the trap vector occupies four words, typically a jump - * to the processing routine. - */ -struct trap_entry { - unsigned sethi_filler:10; - unsigned sethi_imm22:22; - unsigned jmpl_filler:19; - unsigned jmpl_simm13:13; - unsigned long filler[2]; -}; - -/* - * This table contains the mapping between SPARC hardware trap types, and - * signals, which are primarily what GDB understands. It also indicates - * which hardware traps we need to commandeer when initializing the stub. - */ -struct trap_info hard_trap_info[] = { - {1, SIGSEGV}, /* instruction access error */ - {2, SIGILL}, /* privileged instruction */ - {3, SIGILL}, /* illegal instruction */ - {4, SIGEMT}, /* fp disabled */ - {36, SIGEMT}, /* cp disabled */ - {7, SIGBUS}, /* mem address not aligned */ - {9, SIGSEGV}, /* data access exception */ - {10, SIGEMT}, /* tag overflow */ - {128+1, SIGTRAP}, /* ta 1 - normal breakpoint instruction */ - {0, 0} /* Must be last */ -}; - -extern struct trap_entry fltr_proto; -void -exception_handler (int tt, unsigned long routine) -{ - struct trap_entry *tb; /* Trap vector base address */ - - DEBUG (1, "Entering exception_handler()"); - if (tt != 256) { - tb = (struct trap_entry *) (rdtbr() & ~0xfff); - } else { - tt = 255; - tb = (struct trap_entry *) 0; - } - - tb[tt] = fltr_proto; - - tb[tt].sethi_imm22 = routine >> 10; - tb[tt].jmpl_simm13 = routine & 0x3ff; - - DEBUG (1, "Leaving exception_handler()"); -} - -/* - * This is so we can trap a memory fault when reading or writing - * directly to memory. - */ -void -set_mem_fault_trap(enable) - int enable; -{ - extern void fltr_set_mem_err(); - - DEBUG (1, "Entering set_mem_fault_trap()"); - - mem_err = 0; - - if (enable) - exception_handler(9, (unsigned long)fltr_set_mem_err); - else - exception_handler(9, (unsigned long)trap_low); - - DEBUG (1, "Leaving set_mem_fault_trap()"); -} - -/* - * This function does all command procesing for interfacing to gdb. It - * returns 1 if you should skip the instruction at the trap address, 0 - * otherwise. - */ -extern void breakinst(); - -void -handle_exception (registers) - unsigned long *registers; -{ - int sigval; - - /* First, we must force all of the windows to be spilled out */ - - DEBUG (1, "Entering handle_exception()"); - -/* asm("mov %g0, %wim ; nop; nop; nop"); */ - asm(" save %sp, -64, %sp - save %sp, -64, %sp - save %sp, -64, %sp - save %sp, -64, %sp - save %sp, -64, %sp - save %sp, -64, %sp - save %sp, -64, %sp - save %sp, -64, %sp - restore - restore - restore - restore - restore - restore - restore - restore -"); - - if (registers[PC] == (unsigned long)breakinst) { - registers[PC] = registers[NPC]; - registers[NPC] += 4; - } - - /* get the last know signal number from the trap register */ - sigval = computeSignal((registers[TBR] >> 4) & 0xff); - - /* call the main command processing loop for gdb */ - gdb_event_loop (sigval, registers); -} - -/* - * This function will generate a breakpoint exception. It is used at the - * beginning of a program to sync up with a debugger and can be used - * otherwise as a quick means to stop program execution and "break" into - * the debugger. - */ -void -breakpoint() -{ - DEBUG (1, "Entering breakpoint()"); - - if (!initialized) - return; - - asm(" .globl " STRINGSYM(breakinst) " - " STRINGSYM(breakinst) ": ta 128+1 - nop - nop - "); -} - -/* - * This is just a test vector for debugging excpetions. - */ -void -bad_trap(tt) -int tt; -{ - print ("Got a bad trap #"); - outbyte (tt); - outbyte ('\n'); - asm("ta 0 - nop - nop - "); -} - -/* - * This is just a test vector for debugging excpetions. - */ -void -soft_trap(tt) -int tt; -{ - print ("Got a soft trap #"); - outbyte (tt); - outbyte ('\n'); - asm("ta 0 - nop - nop - "); -} - -/* - * Flush the instruction cache. We need to do this for the debugger stub so - * that breakpoints, et. al. become visible to the instruction stream after - * storing them in memory. - * - * For the sparclite, we need to do something here, but for a standard - * sparc (which SIS simulates), we don't. - */ - -void -flush_i_cache () -{ -} - -/* - * This will reset the processor, so we never return from here. - */ -void -target_reset() -{ - asm ("call 0 - nop "); -} - -/* - * g - read registers. - * no params. - * returns a vector of words, size is NUM_REGS. - */ -char * -target_read_registers(unsigned long *registers) -{ - char *ptr; - unsigned long *sp; - - DEBUG (1, "In target_read_registers()"); - - ptr = packet_out_buf; - ptr = mem2hex((char *)registers, ptr, 16 * 4, 0); /* G & O regs */ - ptr = mem2hex((unsigned char *)(sp + 0), ptr, 16 * 4, 0); /* L & I regs */ - memset(ptr, '0', 32 * 8); /* Floating point */ - mem2hex((char *)®isters[Y], - ptr + 32 * 4 * 2, - 8 * 4, - 0); /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */ - return (ptr); -} - -/* - * G - write registers. - * param is a vector of words, size is NUM_REGS. - * returns an OK or an error number. - */ -char * -target_write_registers(unsigned long *registers) -{ - unsigned char *ptr; - unsigned long *sp; - unsigned long *newsp, psr; - - DEBUG (1, "In target_write_registers()"); - - psr = registers[PSR]; - - ptr = &packet_in_buf[1]; - - hex2mem(ptr, (char *)registers, 16 * 4, 0); /* G & O regs */ - hex2mem(ptr + 16 * 4 * 2, (unsigned char *)(sp + 0), 16 * 4, 0); /* L & I regs */ - hex2mem(ptr + 64 * 4 * 2, (char *)®isters[Y], - 8 * 4, 0); /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */ - - /* - * see if the stack pointer has moved. If so, then copy the saved - * locals and ins to the new location. This keeps the window - * overflow and underflow routines happy. - */ - - newsp = (unsigned long *)registers[SP]; - if (sp != newsp) - sp = memcpy(newsp, sp, 16 * 4); - - /* Don't allow CWP to be modified. */ - - if (psr != registers[PSR]) - registers[PSR] = (psr & 0x1f) | (registers[PSR] & ~0x1f); - - return (ptr); -} - -char * -target_dump_state(unsigned long *registers) -{ - int tt; /* Trap type */ - int sigval; - char *ptr; - unsigned long *sp; - - DEBUG (1, "In target_dump_state()"); - - sp = (unsigned long *)registers[SP]; - - tt = (registers[TBR] >> 4) & 0xff; - - /* reply to host that an exception has occurred */ - sigval = computeSignal(tt); - ptr = packet_out_buf; - - *ptr++ = 'T'; - *ptr++ = hexchars[sigval >> 4]; - *ptr++ = hexchars[sigval & 0xf]; - - *ptr++ = hexchars[PC >> 4]; - *ptr++ = hexchars[PC & 0xf]; - *ptr++ = ':'; - ptr = mem2hex((unsigned char *)®isters[PC], ptr, 4, 0); - *ptr++ = ';'; - - *ptr++ = hexchars[FP >> 4]; - *ptr++ = hexchars[FP & 0xf]; - *ptr++ = ':'; - ptr = mem2hex((unsigned char *)(sp + 8 + 6), ptr, 4, 0); /* FP */ - *ptr++ = ';'; - - *ptr++ = hexchars[SP >> 4]; - *ptr++ = hexchars[SP & 0xf]; - *ptr++ = ':'; - ptr = mem2hex((unsigned char *)&sp, ptr, 4, 0); - *ptr++ = ';'; - - *ptr++ = hexchars[NPC >> 4]; - - return (packet_out_buf); -} - -void -write_pc(unsigned long *registers, unsigned long addr) -{ - DEBUG (1, "In write_pc"); - - registers[PC] = addr; - registers[NPC] = addr + 4; -} |