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gdbstub: Implement qemu physical memory mode 

Add a new query/set which changes the memory GDB sees to physical memory
only.

gdb> maint packet qqemu.PhyMemMode
will reply the current phy_mem_mode state (1 for enabled, 0 for disabled)
gdb> maint packet Qqemu.PhyMemMode:1
Will make GDB read/write only to physical memory, set to 0 to disable

Signed-off-by: Jon Doron <arilou@gmail.com>
Message-Id: <20190529064148.19856-21-arilou@gmail.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
This commit is contained in:
Jon Doron 2019-05-29 09:41:48 +03:00 committed by Alex Bennée
parent 3f1cbac73a
commit ab4752ec8d
1 changed files with 60 additions and 2 deletions
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62
gdbstub.c
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@ -50,11 +50,27 @@
#define GDB_ATTACHED "1"
#endif
#ifndef CONFIG_USER_ONLY
static int phy_memory_mode;
#endif
static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr,
uint8_t *buf, int len, bool is_write)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
CPUClass *cc;
#ifndef CONFIG_USER_ONLY
if (phy_memory_mode) {
if (is_write) {
cpu_physical_memory_write(addr, buf, len);
} else {
cpu_physical_memory_read(addr, buf, len);
}
return 0;
}
#endif
cc = CPU_GET_CLASS(cpu);
if (cc->memory_rw_debug) {
return cc->memory_rw_debug(cpu, addr, buf, len, is_write);
}
@ -2136,9 +2152,37 @@ static void handle_query_attached(GdbCmdContext *gdb_ctx, void *user_ctx)
static void handle_query_qemu_supported(GdbCmdContext *gdb_ctx, void *user_ctx)
{
put_packet(gdb_ctx->s, "sstepbits;sstep");
snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "sstepbits;sstep");
#ifndef CONFIG_USER_ONLY
pstrcat(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), ";PhyMemMode");
#endif
put_packet(gdb_ctx->s, gdb_ctx->str_buf);
}
#ifndef CONFIG_USER_ONLY
static void handle_query_qemu_phy_mem_mode(GdbCmdContext *gdb_ctx,
void *user_ctx)
{
snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "%d", phy_memory_mode);
put_packet(gdb_ctx->s, gdb_ctx->str_buf);
}
static void handle_set_qemu_phy_mem_mode(GdbCmdContext *gdb_ctx, void *user_ctx)
{
if (!gdb_ctx->num_params) {
put_packet(gdb_ctx->s, "E22");
return;
}
if (!gdb_ctx->params[0].val_ul) {
phy_memory_mode = 0;
} else {
phy_memory_mode = 1;
}
put_packet(gdb_ctx->s, "OK");
}
#endif
static GdbCmdParseEntry gdb_gen_query_set_common_table[] = {
/* Order is important if has same prefix */
{
@ -2219,6 +2263,12 @@ static GdbCmdParseEntry gdb_gen_query_table[] = {
.handler = handle_query_qemu_supported,
.cmd = "qemu.Supported",
},
#ifndef CONFIG_USER_ONLY
{
.handler = handle_query_qemu_phy_mem_mode,
.cmd = "qemu.PhyMemMode",
},
#endif
};
static GdbCmdParseEntry gdb_gen_set_table[] = {
@ -2229,6 +2279,14 @@ static GdbCmdParseEntry gdb_gen_set_table[] = {
.cmd_startswith = 1,
.schema = "l0"
},
#ifndef CONFIG_USER_ONLY
{
.handler = handle_set_qemu_phy_mem_mode,
.cmd = "qemu.PhyMemMode:",
.cmd_startswith = 1,
.schema = "l0"
},
#endif
};
static void handle_gen_query(GdbCmdContext *gdb_ctx, void *user_ctx)