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![Filip Bozuta](/assets/img/avatar_default.png)
This patch implements functionality for strace argument printing for ioctls. When running ioctls through qemu with "-strace", they get printed in format: "ioctl(fd_num,0x*,0x*) = ret_value" where the request code an the ioctl's third argument get printed in a hexadicemal format. This patch changes that by enabling strace to print both the request code name and the contents of the third argument. For example, when running ioctl RTC_SET_TIME with "-strace", with changes from this patch, it gets printed in this way: "ioctl(3,RTC_SET_TIME,{12,13,15,20,10,119,0,0,0}) = 0" In case of IOC_R type ioctls, the contents of the third argument get printed after the return value, and the argument inside the ioctl call gets printed as pointer in hexadecimal format. For example, when running RTC_RD_TIME with "-strace", with changes from this patch, it gets printed in this way: "ioctl(3,RTC_RD_TIME,0x40800374) = 0 ({22,9,13,11,5,120,0,0,0})" In case of IOC_RW type ioctls, the contents of the third argument get printed both inside the ioctl call and after the return value. Implementation notes: Functions "print_ioctl()" and "print_syscall_ret_ioctl()", that are defined in "strace.c", are listed in file "strace.list" as "call" and "result" value for ioctl. Structure definition "IOCTLEntry" as well as predefined values for IOC_R, IOC_W and IOC_RW were cut and pasted from file "syscall.c" to file "qemu.h" so that they can be used by these functions to print the contents of the third ioctl argument. Also, the "static" identifier for array "ioctl_entries[]" was removed and this array was declared as "extern" in "qemu.h" so that it can also be used by these functions. To decode the structure type of the ioctl third argument, function "thunk_print()" was defined in file "thunk.c" and its definition is somewhat simillar to that of function "thunk_convert()". Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20200619124727.18080-3-filip.bozuta@syrmia.com> [lv: fix close-bracket] Signed-off-by: Laurent Vivier <laurent@vivier.eu>
476 lines
13 KiB
C
476 lines
13 KiB
C
/*
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* Generic thunking code to convert data between host and target CPU
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*
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* Copyright (c) 2003 Fabrice Bellard
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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 "qemu/osdep.h"
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#include "qemu.h"
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#include "exec/user/thunk.h"
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//#define DEBUG
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static unsigned int max_struct_entries;
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StructEntry *struct_entries;
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static const argtype *thunk_type_next_ptr(const argtype *type_ptr);
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static inline const argtype *thunk_type_next(const argtype *type_ptr)
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{
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int type;
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type = *type_ptr++;
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switch(type) {
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case TYPE_CHAR:
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case TYPE_SHORT:
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case TYPE_INT:
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case TYPE_LONGLONG:
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case TYPE_ULONGLONG:
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case TYPE_LONG:
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case TYPE_ULONG:
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case TYPE_PTRVOID:
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case TYPE_OLDDEVT:
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return type_ptr;
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case TYPE_PTR:
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return thunk_type_next_ptr(type_ptr);
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case TYPE_ARRAY:
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return thunk_type_next_ptr(type_ptr + 1);
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case TYPE_STRUCT:
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return type_ptr + 1;
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default:
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return NULL;
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}
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}
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static const argtype *thunk_type_next_ptr(const argtype *type_ptr)
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{
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return thunk_type_next(type_ptr);
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}
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void thunk_register_struct(int id, const char *name, const argtype *types)
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{
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const argtype *type_ptr;
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StructEntry *se;
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int nb_fields, offset, max_align, align, size, i, j;
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assert(id < max_struct_entries);
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/* first we count the number of fields */
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type_ptr = types;
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nb_fields = 0;
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while (*type_ptr != TYPE_NULL) {
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type_ptr = thunk_type_next(type_ptr);
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nb_fields++;
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}
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assert(nb_fields > 0);
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se = struct_entries + id;
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se->field_types = types;
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se->nb_fields = nb_fields;
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se->name = name;
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#ifdef DEBUG
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printf("struct %s: id=%d nb_fields=%d\n",
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se->name, id, se->nb_fields);
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#endif
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/* now we can alloc the data */
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for (i = 0; i < ARRAY_SIZE(se->field_offsets); i++) {
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offset = 0;
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max_align = 1;
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se->field_offsets[i] = g_new(int, nb_fields);
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type_ptr = se->field_types;
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for(j = 0;j < nb_fields; j++) {
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size = thunk_type_size(type_ptr, i);
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align = thunk_type_align(type_ptr, i);
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offset = (offset + align - 1) & ~(align - 1);
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se->field_offsets[i][j] = offset;
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offset += size;
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if (align > max_align)
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max_align = align;
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type_ptr = thunk_type_next(type_ptr);
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}
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offset = (offset + max_align - 1) & ~(max_align - 1);
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se->size[i] = offset;
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se->align[i] = max_align;
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#ifdef DEBUG
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printf("%s: size=%d align=%d\n",
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i == THUNK_HOST ? "host" : "target", offset, max_align);
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#endif
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}
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}
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void thunk_register_struct_direct(int id, const char *name,
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const StructEntry *se1)
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{
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StructEntry *se;
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assert(id < max_struct_entries);
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se = struct_entries + id;
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*se = *se1;
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se->name = name;
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}
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/* now we can define the main conversion functions */
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const argtype *thunk_convert(void *dst, const void *src,
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const argtype *type_ptr, int to_host)
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{
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int type;
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type = *type_ptr++;
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switch(type) {
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case TYPE_CHAR:
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*(uint8_t *)dst = *(uint8_t *)src;
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break;
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case TYPE_SHORT:
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*(uint16_t *)dst = tswap16(*(uint16_t *)src);
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break;
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case TYPE_INT:
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*(uint32_t *)dst = tswap32(*(uint32_t *)src);
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break;
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case TYPE_LONGLONG:
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case TYPE_ULONGLONG:
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*(uint64_t *)dst = tswap64(*(uint64_t *)src);
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break;
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#if HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 32
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case TYPE_LONG:
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case TYPE_ULONG:
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case TYPE_PTRVOID:
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*(uint32_t *)dst = tswap32(*(uint32_t *)src);
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break;
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#elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 32
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case TYPE_LONG:
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case TYPE_ULONG:
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case TYPE_PTRVOID:
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if (to_host) {
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if (type == TYPE_LONG) {
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/* sign extension */
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*(uint64_t *)dst = (int32_t)tswap32(*(uint32_t *)src);
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} else {
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*(uint64_t *)dst = tswap32(*(uint32_t *)src);
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}
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} else {
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*(uint32_t *)dst = tswap32(*(uint64_t *)src & 0xffffffff);
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}
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break;
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#elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64
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case TYPE_LONG:
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case TYPE_ULONG:
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case TYPE_PTRVOID:
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*(uint64_t *)dst = tswap64(*(uint64_t *)src);
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break;
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#elif HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 64
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case TYPE_LONG:
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case TYPE_ULONG:
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case TYPE_PTRVOID:
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if (to_host) {
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*(uint32_t *)dst = tswap64(*(uint64_t *)src);
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} else {
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if (type == TYPE_LONG) {
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/* sign extension */
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*(uint64_t *)dst = tswap64(*(int32_t *)src);
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} else {
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*(uint64_t *)dst = tswap64(*(uint32_t *)src);
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}
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}
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break;
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#else
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#warning unsupported conversion
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#endif
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case TYPE_OLDDEVT:
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{
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uint64_t val = 0;
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switch (thunk_type_size(type_ptr - 1, !to_host)) {
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case 2:
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val = *(uint16_t *)src;
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break;
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case 4:
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val = *(uint32_t *)src;
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break;
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case 8:
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val = *(uint64_t *)src;
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break;
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}
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switch (thunk_type_size(type_ptr - 1, to_host)) {
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case 2:
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*(uint16_t *)dst = tswap16(val);
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break;
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case 4:
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*(uint32_t *)dst = tswap32(val);
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break;
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case 8:
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*(uint64_t *)dst = tswap64(val);
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break;
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}
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break;
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}
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case TYPE_ARRAY:
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{
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int array_length, i, dst_size, src_size;
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const uint8_t *s;
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uint8_t *d;
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array_length = *type_ptr++;
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dst_size = thunk_type_size(type_ptr, to_host);
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src_size = thunk_type_size(type_ptr, 1 - to_host);
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d = dst;
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s = src;
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for(i = 0;i < array_length; i++) {
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thunk_convert(d, s, type_ptr, to_host);
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d += dst_size;
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s += src_size;
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}
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type_ptr = thunk_type_next(type_ptr);
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}
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break;
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case TYPE_STRUCT:
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{
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int i;
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const StructEntry *se;
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const uint8_t *s;
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uint8_t *d;
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const argtype *field_types;
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const int *dst_offsets, *src_offsets;
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assert(*type_ptr < max_struct_entries);
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se = struct_entries + *type_ptr++;
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if (se->convert[0] != NULL) {
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/* specific conversion is needed */
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(*se->convert[to_host])(dst, src);
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} else {
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/* standard struct conversion */
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field_types = se->field_types;
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dst_offsets = se->field_offsets[to_host];
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src_offsets = se->field_offsets[1 - to_host];
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d = dst;
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s = src;
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for(i = 0;i < se->nb_fields; i++) {
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field_types = thunk_convert(d + dst_offsets[i],
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s + src_offsets[i],
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field_types, to_host);
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}
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}
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}
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break;
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default:
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fprintf(stderr, "Invalid type 0x%x\n", type);
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break;
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}
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return type_ptr;
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}
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const argtype *thunk_print(void *arg, const argtype *type_ptr)
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{
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int type;
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type = *type_ptr++;
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switch (type) {
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case TYPE_CHAR:
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qemu_log("%c", *(uint8_t *)arg);
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break;
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case TYPE_SHORT:
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qemu_log("%" PRId16, tswap16(*(uint16_t *)arg));
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break;
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case TYPE_INT:
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qemu_log("%" PRId32, tswap32(*(uint32_t *)arg));
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break;
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case TYPE_LONGLONG:
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qemu_log("%" PRId64, tswap64(*(uint64_t *)arg));
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break;
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case TYPE_ULONGLONG:
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qemu_log("%" PRIu64, tswap64(*(uint64_t *)arg));
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break;
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#if HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 32
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case TYPE_PTRVOID:
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qemu_log("0x%" PRIx32, tswap32(*(uint32_t *)arg));
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break;
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case TYPE_LONG:
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qemu_log("%" PRId32, tswap32(*(uint32_t *)arg));
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break;
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case TYPE_ULONG:
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qemu_log("%" PRIu32, tswap32(*(uint32_t *)arg));
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break;
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#elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 32
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case TYPE_PTRVOID:
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qemu_log("0x%" PRIx32, tswap32(*(uint64_t *)arg & 0xffffffff));
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break;
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case TYPE_LONG:
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qemu_log("%" PRId32, tswap32(*(uint64_t *)arg & 0xffffffff));
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break;
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case TYPE_ULONG:
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qemu_log("%" PRIu32, tswap32(*(uint64_t *)arg & 0xffffffff));
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break;
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#elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64
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case TYPE_PTRVOID:
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qemu_log("0x%" PRIx64, tswap64(*(uint64_t *)arg));
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break;
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case TYPE_LONG:
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qemu_log("%" PRId64, tswap64(*(uint64_t *)arg));
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break;
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case TYPE_ULONG:
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qemu_log("%" PRIu64, tswap64(*(uint64_t *)arg));
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break;
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#else
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case TYPE_PTRVOID:
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qemu_log("0x%" PRIx64, tswap64(*(uint64_t *)arg));
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break;
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case TYPE_LONG:
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qemu_log("%" PRId64, tswap64(*(uint64_t *)arg));
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break;
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case TYPE_ULONG:
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qemu_log("%" PRIu64, tswap64(*(uint64_t *)arg));
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break;
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#endif
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case TYPE_OLDDEVT:
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{
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uint64_t val = 0;
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switch (thunk_type_size(type_ptr - 1, 1)) {
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case 2:
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val = *(uint16_t *)arg;
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break;
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case 4:
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val = *(uint32_t *)arg;
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break;
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case 8:
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val = *(uint64_t *)arg;
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break;
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}
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switch (thunk_type_size(type_ptr - 1, 0)) {
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case 2:
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qemu_log("%" PRIu16, tswap16(val));
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break;
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case 4:
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qemu_log("%" PRIu32, tswap32(val));
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break;
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case 8:
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qemu_log("%" PRIu64, tswap64(val));
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break;
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}
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}
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break;
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case TYPE_ARRAY:
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{
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int i, array_length, arg_size;
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uint8_t *a;
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int is_string = 0;
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array_length = *type_ptr++;
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arg_size = thunk_type_size(type_ptr, 0);
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a = arg;
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if (*type_ptr == TYPE_CHAR) {
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qemu_log("\"");
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is_string = 1;
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} else {
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qemu_log("[");
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}
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for (i = 0; i < array_length; i++) {
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if (i > 0 && !is_string) {
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qemu_log(",");
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}
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thunk_print(a, type_ptr);
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a += arg_size;
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}
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if (is_string) {
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qemu_log("\"");
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} else {
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qemu_log("]");
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}
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type_ptr = thunk_type_next(type_ptr);
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}
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break;
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case TYPE_STRUCT:
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{
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int i;
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const StructEntry *se;
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uint8_t *a;
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const argtype *field_types;
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const int *arg_offsets;
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se = struct_entries + *type_ptr++;
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a = arg;
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field_types = se->field_types;
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arg_offsets = se->field_offsets[0];
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qemu_log("{");
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for (i = 0; i < se->nb_fields; i++) {
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if (i > 0) {
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qemu_log(",");
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}
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field_types = thunk_print(a + arg_offsets[i], field_types);
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}
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qemu_log("}");
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}
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break;
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default:
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g_assert_not_reached();
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}
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return type_ptr;
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}
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/* from em86 */
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/* Utility function: Table-driven functions to translate bitmasks
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* between host and target formats
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*/
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unsigned int target_to_host_bitmask(unsigned int target_mask,
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const bitmask_transtbl * trans_tbl)
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{
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const bitmask_transtbl *btp;
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unsigned int host_mask = 0;
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for (btp = trans_tbl; btp->target_mask && btp->host_mask; btp++) {
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if ((target_mask & btp->target_mask) == btp->target_bits) {
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host_mask |= btp->host_bits;
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}
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}
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return host_mask;
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}
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unsigned int host_to_target_bitmask(unsigned int host_mask,
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const bitmask_transtbl * trans_tbl)
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{
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const bitmask_transtbl *btp;
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unsigned int target_mask = 0;
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for (btp = trans_tbl; btp->target_mask && btp->host_mask; btp++) {
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if ((host_mask & btp->host_mask) == btp->host_bits) {
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target_mask |= btp->target_bits;
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}
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}
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return target_mask;
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}
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int thunk_type_size_array(const argtype *type_ptr, int is_host)
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{
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return thunk_type_size(type_ptr, is_host);
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}
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int thunk_type_align_array(const argtype *type_ptr, int is_host)
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{
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return thunk_type_align(type_ptr, is_host);
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}
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void thunk_init(unsigned int max_structs)
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{
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max_struct_entries = max_structs;
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struct_entries = g_new0(StructEntry, max_structs);
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}
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