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bb962386b8
Add missing calls to synchronise the SoftFloat status with the CP1.FSCR: + for the rounding and flush-to-zero modes upon processor reset, + for the flush-to-zero mode on FSCR updates through the GDB stub. Refactor code accordingly and remove the redundant RESTORE_ROUNDING_MODE macro. Signed-off-by: Thomas Schwinge <thomas@codesourcery.com> Signed-off-by: Maciej W. Rozycki <macro@codesourcery.com> Reviewed-by: Leon Alrae <leon.alrae@imgtec.com> Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
151 lines
4.3 KiB
C
151 lines
4.3 KiB
C
/*
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* MIPS gdb server stub
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*
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* Copyright (c) 2003-2005 Fabrice Bellard
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* Copyright (c) 2013 SUSE LINUX Products GmbH
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "qemu-common.h"
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#include "exec/gdbstub.h"
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int mips_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
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{
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MIPSCPU *cpu = MIPS_CPU(cs);
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CPUMIPSState *env = &cpu->env;
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if (n < 32) {
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return gdb_get_regl(mem_buf, env->active_tc.gpr[n]);
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}
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if (env->CP0_Config1 & (1 << CP0C1_FP) && n >= 38 && n < 72) {
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switch (n) {
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case 70:
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return gdb_get_regl(mem_buf, (int32_t)env->active_fpu.fcr31);
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case 71:
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return gdb_get_regl(mem_buf, (int32_t)env->active_fpu.fcr0);
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default:
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if (env->CP0_Status & (1 << CP0St_FR)) {
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return gdb_get_regl(mem_buf,
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env->active_fpu.fpr[n - 38].d);
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} else {
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return gdb_get_regl(mem_buf,
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env->active_fpu.fpr[n - 38].w[FP_ENDIAN_IDX]);
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}
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}
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}
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switch (n) {
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case 32:
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return gdb_get_regl(mem_buf, (int32_t)env->CP0_Status);
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case 33:
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return gdb_get_regl(mem_buf, env->active_tc.LO[0]);
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case 34:
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return gdb_get_regl(mem_buf, env->active_tc.HI[0]);
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case 35:
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return gdb_get_regl(mem_buf, env->CP0_BadVAddr);
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case 36:
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return gdb_get_regl(mem_buf, (int32_t)env->CP0_Cause);
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case 37:
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return gdb_get_regl(mem_buf, env->active_tc.PC |
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!!(env->hflags & MIPS_HFLAG_M16));
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case 72:
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return gdb_get_regl(mem_buf, 0); /* fp */
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case 89:
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return gdb_get_regl(mem_buf, (int32_t)env->CP0_PRid);
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default:
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if (n > 89) {
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return 0;
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}
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/* 16 embedded regs. */
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return gdb_get_regl(mem_buf, 0);
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}
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return 0;
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}
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int mips_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
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{
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MIPSCPU *cpu = MIPS_CPU(cs);
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CPUMIPSState *env = &cpu->env;
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target_ulong tmp;
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tmp = ldtul_p(mem_buf);
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if (n < 32) {
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env->active_tc.gpr[n] = tmp;
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return sizeof(target_ulong);
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}
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if (env->CP0_Config1 & (1 << CP0C1_FP) && n >= 38 && n < 72) {
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switch (n) {
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case 70:
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env->active_fpu.fcr31 = tmp & 0xFF83FFFF;
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/* set rounding mode */
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restore_rounding_mode(env);
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/* set flush-to-zero mode */
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restore_flush_mode(env);
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break;
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case 71:
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/* FIR is read-only. Ignore writes. */
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break;
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default:
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if (env->CP0_Status & (1 << CP0St_FR)) {
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env->active_fpu.fpr[n - 38].d = tmp;
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} else {
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env->active_fpu.fpr[n - 38].w[FP_ENDIAN_IDX] = tmp;
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}
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break;
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}
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return sizeof(target_ulong);
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}
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switch (n) {
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case 32:
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#ifndef CONFIG_USER_ONLY
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cpu_mips_store_status(env, tmp);
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#endif
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break;
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case 33:
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env->active_tc.LO[0] = tmp;
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break;
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case 34:
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env->active_tc.HI[0] = tmp;
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break;
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case 35:
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env->CP0_BadVAddr = tmp;
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break;
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case 36:
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#ifndef CONFIG_USER_ONLY
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cpu_mips_store_cause(env, tmp);
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#endif
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break;
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case 37:
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env->active_tc.PC = tmp & ~(target_ulong)1;
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if (tmp & 1) {
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env->hflags |= MIPS_HFLAG_M16;
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} else {
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env->hflags &= ~(MIPS_HFLAG_M16);
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}
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break;
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case 72: /* fp, ignored */
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break;
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default:
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if (n > 89) {
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return 0;
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}
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/* Other registers are readonly. Ignore writes. */
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break;
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}
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return sizeof(target_ulong);
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}
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