target/ppc/gdbstub.c - qemu - Git at Google

 /*
  * PowerPC gdb server stub
  *
  * Copyright (c) 2003-2005 Fabrice Bellard
  * Copyright (c) 2013 SUSE LINUX Products GmbH
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "cpu.h"
 #include "exec/gdbstub.h"

 static int ppc_gdb_register_len_apple(int n)
 {
     switch (n) {
     case 0 ... 31:
         /* gprs */
         return 8;
     case 32 ... 63:
         /* fprs */
         return 8;
     case 64 ... 95:
         return 16;
     case 64 + 32: /* nip */
     case 65 + 32: /* msr */
     case 67 + 32: /* lr */
     case 68 + 32: /* ctr */
     case 70 + 32: /* fpscr */
         return 8;
     case 66 + 32: /* cr */
     case 69 + 32: /* xer */
         return 4;
     default:
         return 0;
     }
 }

 static int ppc_gdb_register_len(int n)
 {
     switch (n) {
     case 0 ... 31:
         /* gprs */
         return sizeof(target_ulong);
     case 32 ... 63:
         /* fprs */
         if (gdb_has_xml) {
             return 0;
         }
         return 8;
     case 66:
         /* cr */
     case 69:
         /* xer */
         return 4;
     case 64:
         /* nip */
     case 65:
         /* msr */
     case 67:
         /* lr */
     case 68:
         /* ctr */
         return sizeof(target_ulong);
     case 70:
         /* fpscr */
         if (gdb_has_xml) {
             return 0;
         }
         return sizeof(target_ulong);
     default:
         return 0;
     }
 }

 /*
  * We need to present the registers to gdb in the "current" memory
  * ordering.  For user-only mode we get this for free;
  * TARGET_WORDS_BIGENDIAN is set to the proper ordering for the
  * binary, and cannot be changed.  For system mode,
  * TARGET_WORDS_BIGENDIAN is always set, and we must check the current
  * mode of the chip to see if we're running in little-endian.
  */
 void ppc_maybe_bswap_register(CPUPPCState *env, uint8_t *mem_buf, int len)
 {
 #ifndef CONFIG_USER_ONLY
     if (!msr_le) {
         /* do nothing */
     } else if (len == 4) {
         bswap32s((uint32_t *)mem_buf);
     } else if (len == 8) {
         bswap64s((uint64_t *)mem_buf);
     } else {
         g_assert_not_reached();
     }
 #endif
 }

 /*
  * Old gdb always expects FP registers.  Newer (xml-aware) gdb only
  * expects whatever the target description contains.  Due to a
  * historical mishap the FP registers appear in between core integer
  * regs and PC, MSR, CR, and so forth.  We hack round this by giving
  * the FP regs zero size when talking to a newer gdb.
  */

 int ppc_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
 {
     PowerPCCPU *cpu = POWERPC_CPU(cs);
     CPUPPCState *env = &cpu->env;
     int r = ppc_gdb_register_len(n);

     if (!r) {
         return r;
     }

     if (n < 32) {
         /* gprs */
         gdb_get_regl(mem_buf, env->gpr[n]);
     } else if (n < 64) {
         /* fprs */
         stfq_p(mem_buf, *cpu_fpr_ptr(env, n - 32));
     } else {
         switch (n) {
         case 64:
             gdb_get_regl(mem_buf, env->nip);
             break;
         case 65:
             gdb_get_regl(mem_buf, env->msr);
             break;
         case 66:
             {
                 uint32_t cr = 0;
                 int i;
                 for (i = 0; i < 8; i++) {
                     cr |= env->crf[i] << (32 - ((i + 1) * 4));
                 }
                 gdb_get_reg32(mem_buf, cr);
                 break;
             }
         case 67:
             gdb_get_regl(mem_buf, env->lr);
             break;
         case 68:
             gdb_get_regl(mem_buf, env->ctr);
             break;
         case 69:
             gdb_get_reg32(mem_buf, env->xer);
             break;
         case 70:
             gdb_get_reg32(mem_buf, env->fpscr);
             break;
         }
     }
     ppc_maybe_bswap_register(env, mem_buf, r);
     return r;
 }

 int ppc_cpu_gdb_read_register_apple(CPUState *cs, uint8_t *mem_buf, int n)
 {
     PowerPCCPU *cpu = POWERPC_CPU(cs);
     CPUPPCState *env = &cpu->env;
     int r = ppc_gdb_register_len_apple(n);

     if (!r) {
         return r;
     }

     if (n < 32) {
         /* gprs */
         gdb_get_reg64(mem_buf, env->gpr[n]);
     } else if (n < 64) {
         /* fprs */
         stfq_p(mem_buf, *cpu_fpr_ptr(env, n - 32));
     } else if (n < 96) {
         /* Altivec */
         stq_p(mem_buf, n - 64);
         stq_p(mem_buf + 8, 0);
     } else {
         switch (n) {
         case 64 + 32:
             gdb_get_reg64(mem_buf, env->nip);
             break;
         case 65 + 32:
             gdb_get_reg64(mem_buf, env->msr);
             break;
         case 66 + 32:
             {
                 uint32_t cr = 0;
                 int i;
                 for (i = 0; i < 8; i++) {
                     cr |= env->crf[i] << (32 - ((i + 1) * 4));
                 }
                 gdb_get_reg32(mem_buf, cr);
                 break;
             }
         case 67 + 32:
             gdb_get_reg64(mem_buf, env->lr);
             break;
         case 68 + 32:
             gdb_get_reg64(mem_buf, env->ctr);
             break;
         case 69 + 32:
             gdb_get_reg32(mem_buf, env->xer);
             break;
         case 70 + 32:
             gdb_get_reg64(mem_buf, env->fpscr);
             break;
         }
     }
     ppc_maybe_bswap_register(env, mem_buf, r);
     return r;
 }

 int ppc_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
 {
     PowerPCCPU *cpu = POWERPC_CPU(cs);
     CPUPPCState *env = &cpu->env;
     int r = ppc_gdb_register_len(n);

     if (!r) {
         return r;
     }
     ppc_maybe_bswap_register(env, mem_buf, r);
     if (n < 32) {
         /* gprs */
         env->gpr[n] = ldtul_p(mem_buf);
     } else if (n < 64) {
         /* fprs */
         *cpu_fpr_ptr(env, n - 32) = ldfq_p(mem_buf);
     } else {
         switch (n) {
         case 64:
             env->nip = ldtul_p(mem_buf);
             break;
         case 65:
             ppc_store_msr(env, ldtul_p(mem_buf));
             break;
         case 66:
             {
                 uint32_t cr = ldl_p(mem_buf);
                 int i;
                 for (i = 0; i < 8; i++) {
                     env->crf[i] = (cr >> (32 - ((i + 1) * 4))) & 0xF;
                 }
                 break;
             }
         case 67:
             env->lr = ldtul_p(mem_buf);
             break;
         case 68:
             env->ctr = ldtul_p(mem_buf);
             break;
         case 69:
             env->xer = ldl_p(mem_buf);
             break;
         case 70:
             /* fpscr */
             store_fpscr(env, ldtul_p(mem_buf), 0xffffffff);
             break;
         }
     }
     return r;
 }
 int ppc_cpu_gdb_write_register_apple(CPUState *cs, uint8_t *mem_buf, int n)
 {
     PowerPCCPU *cpu = POWERPC_CPU(cs);
     CPUPPCState *env = &cpu->env;
     int r = ppc_gdb_register_len_apple(n);

     if (!r) {
         return r;
     }
     ppc_maybe_bswap_register(env, mem_buf, r);
     if (n < 32) {
         /* gprs */
         env->gpr[n] = ldq_p(mem_buf);
     } else if (n < 64) {
         /* fprs */
         *cpu_fpr_ptr(env, n - 32) = ldfq_p(mem_buf);
     } else {
         switch (n) {
         case 64 + 32:
             env->nip = ldq_p(mem_buf);
             break;
         case 65 + 32:
             ppc_store_msr(env, ldq_p(mem_buf));
             break;
         case 66 + 32:
             {
                 uint32_t cr = ldl_p(mem_buf);
                 int i;
                 for (i = 0; i < 8; i++) {
                     env->crf[i] = (cr >> (32 - ((i + 1) * 4))) & 0xF;
                 }
                 break;
             }
         case 67 + 32:
             env->lr = ldq_p(mem_buf);
             break;
         case 68 + 32:
             env->ctr = ldq_p(mem_buf);
             break;
         case 69 + 32:
             env->xer = ldl_p(mem_buf);
             break;
         case 70 + 32:
             /* fpscr */
             store_fpscr(env, ldq_p(mem_buf), 0xffffffff);
             break;
         }
     }
     return r;
 }

 #ifndef CONFIG_USER_ONLY
 void ppc_gdb_gen_spr_xml(PowerPCCPU *cpu)
 {
     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
     CPUPPCState *env = &cpu->env;
     GString *xml;
     char *spr_name;
     unsigned int num_regs = 0;
     int i;

     if (pcc->gdb_spr_xml) {
         return;
     }

     xml = g_string_new("<?xml version=\"1.0\"?>");
     g_string_append(xml, "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">");
     g_string_append(xml, "<feature name=\"org.qemu.power.spr\">");

     for (i = 0; i < ARRAY_SIZE(env->spr_cb); i++) {
         ppc_spr_t *spr = &env->spr_cb[i];

         if (!spr->name) {
             continue;
         }

         spr_name = g_ascii_strdown(spr->name, -1);
         g_string_append_printf(xml, "<reg name=\"%s\"", spr_name);
         g_free(spr_name);

         g_string_append_printf(xml, " bitsize=\"%d\"", TARGET_LONG_BITS);
         g_string_append(xml, " group=\"spr\"/>");

         /*
          * GDB identifies registers based on the order they are
          * presented in the XML. These ids will not match QEMU's
          * representation (which follows the PowerISA).
          *
          * Store the position of the current register description so
          * we can make the correspondence later.
          */
         spr->gdb_id = num_regs;
         num_regs++;
     }

     g_string_append(xml, "</feature>");

     pcc->gdb_num_sprs = num_regs;
     pcc->gdb_spr_xml = g_string_free(xml, false);
 }

 const char *ppc_gdb_get_dynamic_xml(CPUState *cs, const char *xml_name)
 {
     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cs);

     if (strcmp(xml_name, "power-spr.xml") == 0) {
         return pcc->gdb_spr_xml;
     }
     return NULL;
 }
 #endif
	/*
	* PowerPC gdb server stub
	*
	* Copyright (c) 2003-2005 Fabrice Bellard
	* Copyright (c) 2013 SUSE LINUX Products GmbH
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library 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
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library; if not, see <http://www.gnu.org/licenses/>.
	*/
	#include "qemu/osdep.h"
	#include "qemu-common.h"
	#include "cpu.h"
	#include "exec/gdbstub.h"

	static int ppc_gdb_register_len_apple(int n)
	{
	switch (n) {
	case 0 ... 31:
	/* gprs */
	return 8;
	case 32 ... 63:
	/* fprs */
	return 8;
	case 64 ... 95:
	return 16;
	case 64 + 32: /* nip */
	case 65 + 32: /* msr */
	case 67 + 32: /* lr */
	case 68 + 32: /* ctr */
	case 70 + 32: /* fpscr */
	return 8;
	case 66 + 32: /* cr */
	case 69 + 32: /* xer */
	return 4;
	default:
	return 0;
	}
	}

	static int ppc_gdb_register_len(int n)
	{
	switch (n) {
	case 0 ... 31:
	/* gprs */
	return sizeof(target_ulong);
	case 32 ... 63:
	/* fprs */
	if (gdb_has_xml) {
	return 0;
	}
	return 8;
	case 66:
	/* cr */
	case 69:
	/* xer */
	return 4;
	case 64:
	/* nip */
	case 65:
	/* msr */
	case 67:
	/* lr */
	case 68:
	/* ctr */
	return sizeof(target_ulong);
	case 70:
	/* fpscr */
	if (gdb_has_xml) {
	return 0;
	}
	return sizeof(target_ulong);
	default:
	return 0;
	}
	}

	/*
	* We need to present the registers to gdb in the "current" memory
	* ordering. For user-only mode we get this for free;
	* TARGET_WORDS_BIGENDIAN is set to the proper ordering for the
	* binary, and cannot be changed. For system mode,
	* TARGET_WORDS_BIGENDIAN is always set, and we must check the current
	* mode of the chip to see if we're running in little-endian.
	*/
	void ppc_maybe_bswap_register(CPUPPCState env, uint8_t mem_buf, int len)
	{
	#ifndef CONFIG_USER_ONLY
	if (!msr_le) {
	/* do nothing */
	} else if (len == 4) {
	bswap32s((uint32_t *)mem_buf);
	} else if (len == 8) {
	bswap64s((uint64_t *)mem_buf);
	} else {
	g_assert_not_reached();
	}
	#endif
	}

	/*
	* Old gdb always expects FP registers. Newer (xml-aware) gdb only
	* expects whatever the target description contains. Due to a
	* historical mishap the FP registers appear in between core integer
	* regs and PC, MSR, CR, and so forth. We hack round this by giving
	* the FP regs zero size when talking to a newer gdb.
	*/

	int ppc_cpu_gdb_read_register(CPUState cs, uint8_t mem_buf, int n)
	{
	PowerPCCPU *cpu = POWERPC_CPU(cs);
	CPUPPCState *env = &cpu->env;
	int r = ppc_gdb_register_len(n);

	if (!r) {
	return r;
	}

	if (n < 32) {
	/* gprs */
	gdb_get_regl(mem_buf, env->gpr[n]);
	} else if (n < 64) {
	/* fprs */
	stfq_p(mem_buf, *cpu_fpr_ptr(env, n - 32));
	} else {
	switch (n) {
	case 64:
	gdb_get_regl(mem_buf, env->nip);
	break;
	case 65:
	gdb_get_regl(mem_buf, env->msr);
	break;
	case 66:
	{
	uint32_t cr = 0;
	int i;
	for (i = 0; i < 8; i++) {
	cr \|= env->crf[i] << (32 - ((i + 1) * 4));
	}
	gdb_get_reg32(mem_buf, cr);
	break;
	}
	case 67:
	gdb_get_regl(mem_buf, env->lr);
	break;
	case 68:
	gdb_get_regl(mem_buf, env->ctr);
	break;
	case 69:
	gdb_get_reg32(mem_buf, env->xer);
	break;
	case 70:
	gdb_get_reg32(mem_buf, env->fpscr);
	break;
	}
	}
	ppc_maybe_bswap_register(env, mem_buf, r);
	return r;
	}

	int ppc_cpu_gdb_read_register_apple(CPUState cs, uint8_t mem_buf, int n)
	{
	PowerPCCPU *cpu = POWERPC_CPU(cs);
	CPUPPCState *env = &cpu->env;
	int r = ppc_gdb_register_len_apple(n);

	if (!r) {
	return r;
	}

	if (n < 32) {
	/* gprs */
	gdb_get_reg64(mem_buf, env->gpr[n]);
	} else if (n < 64) {
	/* fprs */
	stfq_p(mem_buf, *cpu_fpr_ptr(env, n - 32));
	} else if (n < 96) {
	/* Altivec */
	stq_p(mem_buf, n - 64);
	stq_p(mem_buf + 8, 0);
	} else {
	switch (n) {
	case 64 + 32:
	gdb_get_reg64(mem_buf, env->nip);
	break;
	case 65 + 32:
	gdb_get_reg64(mem_buf, env->msr);
	break;
	case 66 + 32:
	{
	uint32_t cr = 0;
	int i;
	for (i = 0; i < 8; i++) {
	cr \|= env->crf[i] << (32 - ((i + 1) * 4));
	}
	gdb_get_reg32(mem_buf, cr);
	break;
	}
	case 67 + 32:
	gdb_get_reg64(mem_buf, env->lr);
	break;
	case 68 + 32:
	gdb_get_reg64(mem_buf, env->ctr);
	break;
	case 69 + 32:
	gdb_get_reg32(mem_buf, env->xer);
	break;
	case 70 + 32:
	gdb_get_reg64(mem_buf, env->fpscr);
	break;
	}
	}
	ppc_maybe_bswap_register(env, mem_buf, r);
	return r;
	}

	int ppc_cpu_gdb_write_register(CPUState cs, uint8_t mem_buf, int n)
	{
	PowerPCCPU *cpu = POWERPC_CPU(cs);
	CPUPPCState *env = &cpu->env;
	int r = ppc_gdb_register_len(n);

	if (!r) {
	return r;
	}
	ppc_maybe_bswap_register(env, mem_buf, r);
	if (n < 32) {
	/* gprs */
	env->gpr[n] = ldtul_p(mem_buf);
	} else if (n < 64) {
	/* fprs */
	*cpu_fpr_ptr(env, n - 32) = ldfq_p(mem_buf);
	} else {
	switch (n) {
	case 64:
	env->nip = ldtul_p(mem_buf);
	break;
	case 65:
	ppc_store_msr(env, ldtul_p(mem_buf));
	break;
	case 66:
	{
	uint32_t cr = ldl_p(mem_buf);
	int i;
	for (i = 0; i < 8; i++) {
	env->crf[i] = (cr >> (32 - ((i + 1) * 4))) & 0xF;
	}
	break;
	}
	case 67:
	env->lr = ldtul_p(mem_buf);
	break;
	case 68:
	env->ctr = ldtul_p(mem_buf);
	break;
	case 69:
	env->xer = ldl_p(mem_buf);
	break;
	case 70:
	/* fpscr */
	store_fpscr(env, ldtul_p(mem_buf), 0xffffffff);
	break;
	}
	}
	return r;
	}
	int ppc_cpu_gdb_write_register_apple(CPUState cs, uint8_t mem_buf, int n)
	{
	PowerPCCPU *cpu = POWERPC_CPU(cs);
	CPUPPCState *env = &cpu->env;
	int r = ppc_gdb_register_len_apple(n);

	if (!r) {
	return r;
	}
	ppc_maybe_bswap_register(env, mem_buf, r);
	if (n < 32) {
	/* gprs */
	env->gpr[n] = ldq_p(mem_buf);
	} else if (n < 64) {
	/* fprs */
	*cpu_fpr_ptr(env, n - 32) = ldfq_p(mem_buf);
	} else {
	switch (n) {
	case 64 + 32:
	env->nip = ldq_p(mem_buf);
	break;
	case 65 + 32:
	ppc_store_msr(env, ldq_p(mem_buf));
	break;
	case 66 + 32:
	{
	uint32_t cr = ldl_p(mem_buf);
	int i;
	for (i = 0; i < 8; i++) {
	env->crf[i] = (cr >> (32 - ((i + 1) * 4))) & 0xF;
	}
	break;
	}
	case 67 + 32:
	env->lr = ldq_p(mem_buf);
	break;
	case 68 + 32:
	env->ctr = ldq_p(mem_buf);
	break;
	case 69 + 32:
	env->xer = ldl_p(mem_buf);
	break;
	case 70 + 32:
	/* fpscr */
	store_fpscr(env, ldq_p(mem_buf), 0xffffffff);
	break;
	}
	}
	return r;
	}

	#ifndef CONFIG_USER_ONLY
	void ppc_gdb_gen_spr_xml(PowerPCCPU *cpu)
	{
	PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
	CPUPPCState *env = &cpu->env;
	GString *xml;
	char *spr_name;
	unsigned int num_regs = 0;
	int i;

	if (pcc->gdb_spr_xml) {
	return;
	}

	xml = g_string_new("<?xml version=\"1.0\"?>");
	g_string_append(xml, "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">");
	g_string_append(xml, "<feature name=\"org.qemu.power.spr\">");

	for (i = 0; i < ARRAY_SIZE(env->spr_cb); i++) {
	ppc_spr_t *spr = &env->spr_cb[i];

	if (!spr->name) {
	continue;
	}

	spr_name = g_ascii_strdown(spr->name, -1);
	g_string_append_printf(xml, "<reg name=\"%s\"", spr_name);
	g_free(spr_name);

	g_string_append_printf(xml, " bitsize=\"%d\"", TARGET_LONG_BITS);
	g_string_append(xml, " group=\"spr\"/>");

	/*
	* GDB identifies registers based on the order they are
	* presented in the XML. These ids will not match QEMU's
	* representation (which follows the PowerISA).
	*
	* Store the position of the current register description so
	* we can make the correspondence later.
	*/
	spr->gdb_id = num_regs;
	num_regs++;
	}

	g_string_append(xml, "</feature>");

	pcc->gdb_num_sprs = num_regs;
	pcc->gdb_spr_xml = g_string_free(xml, false);
	}

	const char ppc_gdb_get_dynamic_xml(CPUState cs, const char *xml_name)
	{
	PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cs);

	if (strcmp(xml_name, "power-spr.xml") == 0) {
	return pcc->gdb_spr_xml;
	}
	return NULL;
	}
	#endif