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qemu-e2k/target/i386/gdbstub.c
Alex Bennée a010bdbe71 gdbstub: extend GByteArray to read register helpers 
Instead of passing a pointer to memory now just extend the GByteArray
to all the read register helpers. They can then safely append their
data through the normal way. We don't bother with this abstraction for
write registers as we have already ensured the buffer being copied
from is the correct size.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Damien Hedde <damien.hedde@greensocs.com>

Message-Id: <20200316172155.971-15-alex.bennee@linaro.org>
2020-03-17 17:38:38 +00:00

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/*
* x86 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 "cpu.h"
#include "exec/gdbstub.h"
#ifdef TARGET_X86_64
static const int gpr_map[16] = {
R_EAX, R_EBX, R_ECX, R_EDX, R_ESI, R_EDI, R_EBP, R_ESP,
8, 9, 10, 11, 12, 13, 14, 15
};
#else
#define gpr_map gpr_map32
#endif
static const int gpr_map32[8] = { 0, 1, 2, 3, 4, 5, 6, 7 };
/*
* Keep these in sync with assignment to
* gdb_num_core_regs in target/i386/cpu.c
* and with the machine description
*/
/*
* SEG: 6 segments, plus fs_base, gs_base, kernel_gs_base
*/
/*
* general regs -----> 8 or 16
*/
#define IDX_NB_IP 1
#define IDX_NB_FLAGS 1
#define IDX_NB_SEG (6 + 3)
#define IDX_NB_CTL 6
#define IDX_NB_FP 16
/*
* fpu regs ----------> 8 or 16
*/
#define IDX_NB_MXCSR 1
/*
* total ----> 8+1+1+9+6+16+8+1=50 or 16+1+1+9+6+16+16+1=66
*/
#define IDX_IP_REG CPU_NB_REGS
#define IDX_FLAGS_REG (IDX_IP_REG + IDX_NB_IP)
#define IDX_SEG_REGS (IDX_FLAGS_REG + IDX_NB_FLAGS)
#define IDX_CTL_REGS (IDX_SEG_REGS + IDX_NB_SEG)
#define IDX_FP_REGS (IDX_CTL_REGS + IDX_NB_CTL)
#define IDX_XMM_REGS (IDX_FP_REGS + IDX_NB_FP)
#define IDX_MXCSR_REG (IDX_XMM_REGS + CPU_NB_REGS)
#define IDX_CTL_CR0_REG (IDX_CTL_REGS + 0)
#define IDX_CTL_CR2_REG (IDX_CTL_REGS + 1)
#define IDX_CTL_CR3_REG (IDX_CTL_REGS + 2)
#define IDX_CTL_CR4_REG (IDX_CTL_REGS + 3)
#define IDX_CTL_CR8_REG (IDX_CTL_REGS + 4)
#define IDX_CTL_EFER_REG (IDX_CTL_REGS + 5)
#ifdef TARGET_X86_64
#define GDB_FORCE_64 1
#else
#define GDB_FORCE_64 0
#endif
int x86_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
{
X86CPU *cpu = X86_CPU(cs);
CPUX86State *env = &cpu->env;
uint64_t tpr;
/* N.B. GDB can't deal with changes in registers or sizes in the middle
of a session. So if we're in 32-bit mode on a 64-bit cpu, still act
as if we're on a 64-bit cpu. */
if (n < CPU_NB_REGS) {
if (TARGET_LONG_BITS == 64) {
if (env->hflags & HF_CS64_MASK) {
return gdb_get_reg64(mem_buf, env->regs[gpr_map[n]]);
} else if (n < CPU_NB_REGS32) {
return gdb_get_reg64(mem_buf,
env->regs[gpr_map[n]] & 0xffffffffUL);
} else {
return gdb_get_regl(mem_buf, 0);
}
} else {
return gdb_get_reg32(mem_buf, env->regs[gpr_map32[n]]);
}
} else if (n >= IDX_FP_REGS && n < IDX_FP_REGS + 8) {
floatx80 *fp = (floatx80 *) &env->fpregs[n - IDX_FP_REGS];
int len = gdb_get_reg64(mem_buf, cpu_to_le64(fp->low));
len += gdb_get_reg16(mem_buf + len, cpu_to_le16(fp->high));
return len;
} else if (n >= IDX_XMM_REGS && n < IDX_XMM_REGS + CPU_NB_REGS) {
n -= IDX_XMM_REGS;
if (n < CPU_NB_REGS32 || TARGET_LONG_BITS == 64) {
return gdb_get_reg128(mem_buf,
env->xmm_regs[n].ZMM_Q(0),
env->xmm_regs[n].ZMM_Q(1));
}
} else {
switch (n) {
case IDX_IP_REG:
if (TARGET_LONG_BITS == 64) {
if (env->hflags & HF_CS64_MASK) {
return gdb_get_reg64(mem_buf, env->eip);
} else {
return gdb_get_reg64(mem_buf, env->eip & 0xffffffffUL);
}
} else {
return gdb_get_reg32(mem_buf, env->eip);
}
case IDX_FLAGS_REG:
return gdb_get_reg32(mem_buf, env->eflags);
case IDX_SEG_REGS:
return gdb_get_reg32(mem_buf, env->segs[R_CS].selector);
case IDX_SEG_REGS + 1:
return gdb_get_reg32(mem_buf, env->segs[R_SS].selector);
case IDX_SEG_REGS + 2:
return gdb_get_reg32(mem_buf, env->segs[R_DS].selector);
case IDX_SEG_REGS + 3:
return gdb_get_reg32(mem_buf, env->segs[R_ES].selector);
case IDX_SEG_REGS + 4:
return gdb_get_reg32(mem_buf, env->segs[R_FS].selector);
case IDX_SEG_REGS + 5:
return gdb_get_reg32(mem_buf, env->segs[R_GS].selector);
case IDX_SEG_REGS + 6:
if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
return gdb_get_reg64(mem_buf, env->segs[R_FS].base);
}
return gdb_get_reg32(mem_buf, env->segs[R_FS].base);
case IDX_SEG_REGS + 7:
if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
return gdb_get_reg64(mem_buf, env->segs[R_GS].base);
}
return gdb_get_reg32(mem_buf, env->segs[R_GS].base);
case IDX_SEG_REGS + 8:
#ifdef TARGET_X86_64
if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
return gdb_get_reg64(mem_buf, env->kernelgsbase);
}
return gdb_get_reg32(mem_buf, env->kernelgsbase);
#else
return gdb_get_reg32(mem_buf, 0);
#endif
case IDX_FP_REGS + 8:
return gdb_get_reg32(mem_buf, env->fpuc);
case IDX_FP_REGS + 9:
return gdb_get_reg32(mem_buf, (env->fpus & ~0x3800) |
(env->fpstt & 0x7) << 11);
case IDX_FP_REGS + 10:
return gdb_get_reg32(mem_buf, 0); /* ftag */
case IDX_FP_REGS + 11:
return gdb_get_reg32(mem_buf, 0); /* fiseg */
case IDX_FP_REGS + 12:
return gdb_get_reg32(mem_buf, 0); /* fioff */
case IDX_FP_REGS + 13:
return gdb_get_reg32(mem_buf, 0); /* foseg */
case IDX_FP_REGS + 14:
return gdb_get_reg32(mem_buf, 0); /* fooff */
case IDX_FP_REGS + 15:
return gdb_get_reg32(mem_buf, 0); /* fop */
case IDX_MXCSR_REG:
return gdb_get_reg32(mem_buf, env->mxcsr);
case IDX_CTL_CR0_REG:
if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
return gdb_get_reg64(mem_buf, env->cr[0]);
}
return gdb_get_reg32(mem_buf, env->cr[0]);
case IDX_CTL_CR2_REG:
if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
return gdb_get_reg64(mem_buf, env->cr[2]);
}
return gdb_get_reg32(mem_buf, env->cr[2]);
case IDX_CTL_CR3_REG:
if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
return gdb_get_reg64(mem_buf, env->cr[3]);
}
return gdb_get_reg32(mem_buf, env->cr[3]);
case IDX_CTL_CR4_REG:
if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
return gdb_get_reg64(mem_buf, env->cr[4]);
}
return gdb_get_reg32(mem_buf, env->cr[4]);
case IDX_CTL_CR8_REG:
#ifdef CONFIG_SOFTMMU
tpr = cpu_get_apic_tpr(cpu->apic_state);
#else
tpr = 0;
#endif
if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
return gdb_get_reg64(mem_buf, tpr);
}
return gdb_get_reg32(mem_buf, tpr);
case IDX_CTL_EFER_REG:
if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
return gdb_get_reg64(mem_buf, env->efer);
}
return gdb_get_reg32(mem_buf, env->efer);
}
}
return 0;
}
static int x86_cpu_gdb_load_seg(X86CPU *cpu, int sreg, uint8_t *mem_buf)
{
CPUX86State *env = &cpu->env;
uint16_t selector = ldl_p(mem_buf);
if (selector != env->segs[sreg].selector) {
#if defined(CONFIG_USER_ONLY)
cpu_x86_load_seg(env, sreg, selector);
#else
unsigned int limit, flags;
target_ulong base;
if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK)) {
int dpl = (env->eflags & VM_MASK) ? 3 : 0;
base = selector << 4;
limit = 0xffff;
flags = DESC_P_MASK | DESC_S_MASK | DESC_W_MASK |
DESC_A_MASK | (dpl << DESC_DPL_SHIFT);
} else {
if (!cpu_x86_get_descr_debug(env, selector, &base, &limit,
&flags)) {
return 4;
}
}
cpu_x86_load_seg_cache(env, sreg, selector, base, limit, flags);
#endif
}
return 4;
}
int x86_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
{
X86CPU *cpu = X86_CPU(cs);
CPUX86State *env = &cpu->env;
uint32_t tmp;
/* N.B. GDB can't deal with changes in registers or sizes in the middle
of a session. So if we're in 32-bit mode on a 64-bit cpu, still act
as if we're on a 64-bit cpu. */
if (n < CPU_NB_REGS) {
if (TARGET_LONG_BITS == 64) {
if (env->hflags & HF_CS64_MASK) {
env->regs[gpr_map[n]] = ldtul_p(mem_buf);
} else if (n < CPU_NB_REGS32) {
env->regs[gpr_map[n]] = ldtul_p(mem_buf) & 0xffffffffUL;
}
return sizeof(target_ulong);
} else if (n < CPU_NB_REGS32) {
n = gpr_map32[n];
env->regs[n] &= ~0xffffffffUL;
env->regs[n] |= (uint32_t)ldl_p(mem_buf);
return 4;
}
} else if (n >= IDX_FP_REGS && n < IDX_FP_REGS + 8) {
floatx80 *fp = (floatx80 *) &env->fpregs[n - IDX_FP_REGS];
fp->low = le64_to_cpu(* (uint64_t *) mem_buf);
fp->high = le16_to_cpu(* (uint16_t *) (mem_buf + 8));
return 10;
} else if (n >= IDX_XMM_REGS && n < IDX_XMM_REGS + CPU_NB_REGS) {
n -= IDX_XMM_REGS;
if (n < CPU_NB_REGS32 || TARGET_LONG_BITS == 64) {
env->xmm_regs[n].ZMM_Q(0) = ldq_p(mem_buf);
env->xmm_regs[n].ZMM_Q(1) = ldq_p(mem_buf + 8);
return 16;
}
} else {
switch (n) {
case IDX_IP_REG:
if (TARGET_LONG_BITS == 64) {
if (env->hflags & HF_CS64_MASK) {
env->eip = ldq_p(mem_buf);
} else {
env->eip = ldq_p(mem_buf) & 0xffffffffUL;
}
return 8;
} else {
env->eip &= ~0xffffffffUL;
env->eip |= (uint32_t)ldl_p(mem_buf);
return 4;
}
case IDX_FLAGS_REG:
env->eflags = ldl_p(mem_buf);
return 4;
case IDX_SEG_REGS:
return x86_cpu_gdb_load_seg(cpu, R_CS, mem_buf);
case IDX_SEG_REGS + 1:
return x86_cpu_gdb_load_seg(cpu, R_SS, mem_buf);
case IDX_SEG_REGS + 2:
return x86_cpu_gdb_load_seg(cpu, R_DS, mem_buf);
case IDX_SEG_REGS + 3:
return x86_cpu_gdb_load_seg(cpu, R_ES, mem_buf);
case IDX_SEG_REGS + 4:
return x86_cpu_gdb_load_seg(cpu, R_FS, mem_buf);
case IDX_SEG_REGS + 5:
return x86_cpu_gdb_load_seg(cpu, R_GS, mem_buf);
case IDX_SEG_REGS + 6:
if (env->hflags & HF_CS64_MASK) {
env->segs[R_FS].base = ldq_p(mem_buf);
return 8;
}
env->segs[R_FS].base = ldl_p(mem_buf);
return 4;
case IDX_SEG_REGS + 7:
if (env->hflags & HF_CS64_MASK) {
env->segs[R_GS].base = ldq_p(mem_buf);
return 8;
}
env->segs[R_GS].base = ldl_p(mem_buf);
return 4;
case IDX_SEG_REGS + 8:
#ifdef TARGET_X86_64
if (env->hflags & HF_CS64_MASK) {
env->kernelgsbase = ldq_p(mem_buf);
return 8;
}
env->kernelgsbase = ldl_p(mem_buf);
#endif
return 4;
case IDX_FP_REGS + 8:
cpu_set_fpuc(env, ldl_p(mem_buf));
return 4;
case IDX_FP_REGS + 9:
tmp = ldl_p(mem_buf);
env->fpstt = (tmp >> 11) & 7;
env->fpus = tmp & ~0x3800;
return 4;
case IDX_FP_REGS + 10: /* ftag */
return 4;
case IDX_FP_REGS + 11: /* fiseg */
return 4;
case IDX_FP_REGS + 12: /* fioff */
return 4;
case IDX_FP_REGS + 13: /* foseg */
return 4;
case IDX_FP_REGS + 14: /* fooff */
return 4;
case IDX_FP_REGS + 15: /* fop */
return 4;
case IDX_MXCSR_REG:
cpu_set_mxcsr(env, ldl_p(mem_buf));
return 4;
case IDX_CTL_CR0_REG:
if (env->hflags & HF_CS64_MASK) {
cpu_x86_update_cr0(env, ldq_p(mem_buf));
return 8;
}
cpu_x86_update_cr0(env, ldl_p(mem_buf));
return 4;
case IDX_CTL_CR2_REG:
if (env->hflags & HF_CS64_MASK) {
env->cr[2] = ldq_p(mem_buf);
return 8;
}
env->cr[2] = ldl_p(mem_buf);
return 4;
case IDX_CTL_CR3_REG:
if (env->hflags & HF_CS64_MASK) {
cpu_x86_update_cr3(env, ldq_p(mem_buf));
return 8;
}
cpu_x86_update_cr3(env, ldl_p(mem_buf));
return 4;
case IDX_CTL_CR4_REG:
if (env->hflags & HF_CS64_MASK) {
cpu_x86_update_cr4(env, ldq_p(mem_buf));
return 8;
}
cpu_x86_update_cr4(env, ldl_p(mem_buf));
return 4;
case IDX_CTL_CR8_REG:
if (env->hflags & HF_CS64_MASK) {
#ifdef CONFIG_SOFTMMU
cpu_set_apic_tpr(cpu->apic_state, ldq_p(mem_buf));
#endif
return 8;
}
#ifdef CONFIG_SOFTMMU
cpu_set_apic_tpr(cpu->apic_state, ldl_p(mem_buf));
#endif
return 4;
case IDX_CTL_EFER_REG:
if (env->hflags & HF_CS64_MASK) {
cpu_load_efer(env, ldq_p(mem_buf));
return 8;
}
cpu_load_efer(env, ldl_p(mem_buf));
return 4;
}
}
/* Unrecognised register. */
return 0;
}
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