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semihosting: User defined operation, Tcl command exec on host

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Enabling a portion (0x100 - 0x107) of the user defined semihosting
operation number range (0x100 - 0x1FF) to be processed with the help of
the existing target event mechanism, to implement a general-purpose Tcl
interface for the target available on the host, via semihosting
interface.

Example usage:
- The user configures a Tcl command as a callback for one of the newly
	defined events (semihosting-user-cmd-0x10X) in the configuration
	file.
- The target can make a semihosting call with <opnum>, passing optional
	parameters for the call.

If there is no callback registered to the user defined operation number,
nothing happens.

Example usage: Configure RTT automatically with the exact, linked
control block location from target.

Signed-off-by: Zoltán Dudás <zedudi@gmail.com>
Change-Id: I10e1784b1fecd4e630d78df81cb44bf1aa2fc247
Reviewed-on: https://review.openocd.org/c/openocd/+/6748
Tested-by: jenkins
Reviewed-by: Oleksij Rempel <linux@rempel-privat.de>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
This commit is contained in:
Zoltán Dudás
2021-11-24 17:13:50 +01:00
committed by Antonio Borneo
parent dbbac5f11d
commit 5ab74bde06
7 changed files with 162 additions and 4 deletions
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4
src/target/riscv/riscv_semihosting.c
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@@ -140,7 +140,9 @@ semihosting_result_t riscv_semihosting(struct target *target, int *retval)
semihosting->word_size_bytes = riscv_xlen(target) / 8;
/* Check for ARM operation numbers. */
if (semihosting->op >= 0 && semihosting->op <= 0x31) {
if ((semihosting->op >= 0 && semihosting->op <= 0x31) ||
(semihosting->op >= 0x100 && semihosting->op <= 0x107)) {
*retval = semihosting_common(target);
if (*retval != ERROR_OK) {
LOG_ERROR("Failed semihosting operation (0x%02X)", semihosting->op);