Improved handling of unavailable harts

Added more handling of unexamined harts

Added even more handling of unexamined harts

Added cleaner handling of unexamined harts

Fixing halt_set_dcsr_ebreak not setting hart explicitly enough

Adding riscv013_halt_current_hart function

Handling harts becoming available when halted

Extending handling of unavailable harts

Ensuring target is selected when resuming it

Making halt_set_dcsr_ebreak more robust

OK if target is unavailble after waiting for halt

Can also use progbuf only for dcsr_ebreak

Using progbuf for set_dcsr_break now works

Handle unavailability when deasserting reset

src/target/riscv/opcodes.h

@@ -71,6 +71,12 @@ static uint32_t jal(unsigned int rd, uint32_t imm)
 	return imm_j(imm) | inst_rd(rd) | MATCH_JAL;
 }
 
+static uint32_t csrci(unsigned int csr, uint16_t imm) __attribute__ ((unused));
+static uint32_t csrci(unsigned int csr, uint16_t imm)
+{
+	return imm_i(csr) | inst_rs1(imm) | MATCH_CSRRCI;
+}
+
 static uint32_t csrsi(unsigned int csr, uint16_t imm) __attribute__ ((unused));
 static uint32_t csrsi(unsigned int csr, uint16_t imm)
 {
@@ -143,6 +149,12 @@ static uint32_t csrr(unsigned int rd, unsigned int csr)
 	return imm_i(csr) | inst_rd(rd) | MATCH_CSRRS;
 }
 
+static uint32_t csrrc(unsigned int rd, unsigned int rs, unsigned int csr) __attribute__ ((unused));
+static uint32_t csrrc(unsigned int rd, unsigned int rs, unsigned int csr)
+{
+	return imm_i(csr) | inst_rs1(rs) | inst_rd(rd) | MATCH_CSRRC;
+}
+
 static uint32_t csrrs(unsigned int rd, unsigned int rs, unsigned int csr) __attribute__ ((unused));
 static uint32_t csrrs(unsigned int rd, unsigned int rs, unsigned int csr)
 {