Hi, This patch adds support for sending AUXV packet. This is required for debugging Linux position independent executables. Otherwise, gdb client cannot find out where the executable is loaded.
Signed-off-by: Wei-cheng, Wang <cole...@gmail.com> --- gdbstub.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/gdbstub.c b/gdbstub.c index d1b5afd..30f3bbc 100644 --- a/gdbstub.c +++ b/gdbstub.c @@ -1127,6 +1127,7 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf) if (cc->gdb_core_xml_file != NULL) { pstrcat(buf, sizeof(buf), ";qXfer:features:read+"); } + pstrcat(buf, sizeof(buf), ";qXfer:auxv:read+"); put_packet(s, buf); break; } @@ -1173,6 +1174,46 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf) put_packet_binary(s, buf, len + 1); break; } +#ifdef CONFIG_USER_ONLY + if (strncmp(p, "Xfer:auxv:read:", 15) == 0) { + TaskState *ts = s->c_cpu->opaque; + target_ulong auxv = ts->info->saved_auxv; + target_ulong auxv_len = ts->info->auxv_len; + char *ptr; + + p += 15; + while (*p && *p != ':') + p++; + p++; + + addr = strtoul(p, (char **)&p, 16); + if (*p == ',') + p++; + len = strtoul(p, (char **)&p, 16); + + ptr = lock_user(VERIFY_READ, auxv, auxv_len, 0); + if (ptr == NULL) { + break; + } + + if (addr > len) { + snprintf(buf, sizeof(buf), "E00"); + put_packet(s, buf); + break; + } + if (len > (MAX_PACKET_LENGTH - 5) / 2) + len = (MAX_PACKET_LENGTH - 5) / 2; + if (len < auxv_len - addr) { + buf[0] = 'm'; + len = memtox(buf + 1, ptr + addr, len); + } else { + buf[0] = 'l'; + len = memtox(buf + 1, ptr + addr, auxv_len - addr); + } + put_packet_binary(s, buf, len + 1); + unlock_user(ptr, auxv, len); + } +#endif /* !CONFIG_USER_ONLY */ /* Unrecognised 'q' command. */ goto unknown_command; -- 1.9.1