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bh=y/M8LV+vonvkcoXieKZ5UXuMkIdNIqGy6GN2AoX4d8Q=; b=ZMAsV/bnFNQWQbmCkbO3y1Rr8v84G4FUcqA625LjF3SqcaOEW+1aN6Iwa2SXfOo0iA d67NKSWjIAZY6WUv+u13qkPltZ2X9qUqjbr2DxBlVrQImzFVORV3VJn0RQt11PLblVo7 be93fzf28N7skIlTRhF+FXXjFJpA83TMTmeFDr6n3GPeWtqG9LpnAzEYkewqqU+3y7Ao PA78mVbk4cwqnuxVpsSj53tG6Z0Xuj9nxfs0drjvyTckQJA44KpikgKUUxSwvHnkOs2H cu6ARJa5XZfDcR/4p64tNdiW5cAIUrF5DOOQKEtuFCbQE+kixNxi0BFeyulG3L54YHEU oNXA== X-Gm-Message-State: AOJu0Yy5e00q1wrKWM/kvV4XZ8EGqbzSj5gxvmKUK6djdMtS0A+bDqfN EaN7OqVx4gWlIoBGE58CBxYNasAG3nlj5qH3ZARE6Ti+nvnWsn51+3uEgiJpiVg33496qixMBL6 x X-Received: by 2002:a05:6a00:4f93:b0:71e:55e2:2c58 with SMTP id d2e1a72fcca58-720ab3f31a7mr16409713b3a.15.1730516218018; Fri, 01 Nov 2024 19:56:58 -0700 (PDT) Received: from localhost ([2804:14d:7e39:8470:f214:b4dc:314a:c1ee]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-720bc1e6bdcsm3365234b3a.58.2024.11.01.19.56.57 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Nov 2024 19:56:57 -0700 (PDT) From: Thiago Jung Bauermann To: gdb-patches@sourceware.org Subject: [RFC PATCH v4 06/15] gdbserver: Implement p and P packets Date: Fri, 1 Nov 2024 23:56:26 -0300 Message-ID: <20241102025635.586759-7-thiago.bauermann@linaro.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20241102025635.586759-1-thiago.bauermann@linaro.org> References: <20241102025635.586759-1-thiago.bauermann@linaro.org> MIME-Version: 1.0 X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~patch=linaro.org@sourceware.org GDB will need the p packet to individually request "load early" registers before using the g packet. Not sure if P is necessary, but if p is supported, why not implement P? Alternatively, to be more efficient there could be a packet where GDB can specify a list of registers it wants do load or set. Or there could be a register to request/set the expedited registers. --- gdbserver/regcache.cc | 44 +++++++++++++++++++++++++ gdbserver/regcache.h | 9 ++++++ gdbserver/server.cc | 75 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 128 insertions(+) diff --git a/gdbserver/regcache.cc b/gdbserver/regcache.cc index 6a1526246867..ec19864bd690 100644 --- a/gdbserver/regcache.cc +++ b/gdbserver/regcache.cc @@ -208,6 +208,50 @@ find_register_by_number (const struct target_desc *tdesc, int n) #ifndef IN_PROCESS_AGENT +static gdb::array_view register_data (const struct regcache *regcache, + int n); + +/* See regcache.h. */ + +void +register_to_string (struct regcache *regcache, int regnum, char *buf) +{ + if (regcache->register_status[regnum] == REG_VALID) + { + gdb::array_view value = register_data (regcache, regnum); + + bin2hex (value.data (), buf, value.size ()); + buf[value.size () * 2] = '\0'; + } + else + { + int len = regcache->register_size (regnum) * 2; + + memset (buf, 'x', len); + buf[len] = '\0'; + } +} + +/* See regcache.h. */ + +void +register_from_string (struct regcache *regcache, int regnum, char *buf) +{ + int len = strlen (buf); + gdb::array_view value = register_data (regcache, regnum); + int expected_len = value.size () * 2; + + if (len != expected_len) + { + warning ("Wrong sized packet for register %d (expected %d bytes, got %d)", + regnum, expected_len, len); + if (len > expected_len) + len = expected_len; + } + + hex2bin (buf, value.data (), len / 2); +} + void registers_to_string (struct regcache *regcache, char *buf) { diff --git a/gdbserver/regcache.h b/gdbserver/regcache.h index df0feca102e0..5de8fd3d127e 100644 --- a/gdbserver/regcache.h +++ b/gdbserver/regcache.h @@ -96,6 +96,15 @@ void regcache_invalidate (void); void regcache_release (void); +/* Save contents of register REGNUM to BUF as an hexadecimal string. */ + +void register_to_string (struct regcache *regcache, int regnum, char *buf); + +/* Set contents of register REGNUM from BUF, interpreted as an hexadecimal + string. */ + +void register_from_string (struct regcache *regcache, int regnum, char *buf); + /* Convert all registers to a string in the currently specified remote format. */ diff --git a/gdbserver/server.cc b/gdbserver/server.cc index 5190df4aed5f..4d075fce2359 100644 --- a/gdbserver/server.cc +++ b/gdbserver/server.cc @@ -4712,6 +4712,81 @@ process_serial_event (void) } } break; + case 'p': + { + require_running_or_break (cs.own_buf); + if (cs.current_traceframe >= 0) + { + write_enn (cs.own_buf); + break; + } + if (!set_desired_thread ()) + { + write_enn (cs.own_buf); + break; + } + + int i = 1, regnum = 0; + char c; + while ((c = cs.own_buf[i++]) != '\0') + { + regnum = regnum << 4; + regnum |= fromhex (c) & 0x0f; + } + + struct regcache *regcache = get_thread_regcache (current_thread, true); + + if (regnum < 0 || regnum >= regcache->tdesc->reg_defs.size ()) + { + write_enn (cs.own_buf); + break; + } + + fetch_inferior_registers (regcache, regnum); + register_to_string (regcache, regnum, cs.own_buf); + } + break; + case 'P': + { + require_running_or_break (cs.own_buf); + if (cs.current_traceframe >= 0) + { + write_enn (cs.own_buf); + break; + } + if (!set_desired_thread ()) + { + write_enn (cs.own_buf); + break; + } + if (strchr (cs.own_buf, '=') == nullptr) + { + write_enn (cs.own_buf); + break; + } + + int i = 1, regnum = 0; + char c; + while ((c = cs.own_buf[i++]) != '=') + { + regnum = regnum << 4; + regnum |= fromhex (c) & 0x0f; + } + + struct regcache *regcache = get_thread_regcache (current_thread, true); + + if (regnum < 0 || regnum >= regcache->tdesc->reg_defs.size ()) + { + write_enn (cs.own_buf); + break; + } + + register_from_string (regcache, regnum, &cs.own_buf[i]); + /* FIXME: Why doesn't the G packet need this as well? */ + store_inferior_registers (regcache, regnum); + write_ok (cs.own_buf); + } + break; case 'm': { require_running_or_break (cs.own_buf);