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bhyve: Add support for the 'p' query

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This lets gdb query individual registers.  It's easy to implement and is
used by gdb when attaching to a CHERI target, so let's support it.

Sponsored by:	Innovate UK
Reviewed by:	corvink, jhb
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D43664
This commit is contained in:
Mark Johnston 2024-02-07 08:46:59 -05:00
parent f1e8d3361b
commit e6516294f4
1 changed files with 27 additions and 3 deletions
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30
usr.sbin/bhyve/gdb.c
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@ -1035,6 +1035,29 @@ gdb_read_regs(void)
finish_packet();
}
static void
gdb_read_one_reg(const uint8_t *data, size_t len)
{
uint64_t regval;
uintmax_t reg;
reg = parse_integer(data, len);
if (reg >= nitems(gdb_regset)) {
send_error(EINVAL);
return;
}
if (vm_get_register(vcpus[cur_vcpu], gdb_regset[reg].id, &regval) ==
-1) {
send_error(errno);
return;
}
start_packet();
append_unsigned_native(regval, gdb_regset[reg].size);
finish_packet();
}
static void
gdb_read_mem(const uint8_t *data, size_t len)
{
@ -1597,10 +1620,12 @@ handle_command(const uint8_t *data, size_t len)
/* TODO: Resume any stopped CPUs. */
break;
case 'g': {
case 'g':
gdb_read_regs();
break;
}
case 'p':
gdb_read_one_reg(data + 1, len - 1);
break;
case 'H': {
int tid;
@ -1672,7 +1697,6 @@ handle_command(const uint8_t *data, size_t len)
case 'v':
/* Handle 'vCont' */
/* 'vCtrlC' */
case 'p': /* TODO */
case 'P': /* TODO */
case 'Q': /* TODO */
case 't': /* TODO */