Add RISC-V support.

This supports both 0.11 and 0.13 versions of the debug spec.

Support for `-rtos riscv` will come in a separate commit since it was
easy to separate out, and is likely to be more controversial.

Flash support for the SiFive boards will also come in a later commit.

Change-Id: I1d38fe669c2041b4e21a5c54a091594aac3e2190
Signed-off-by: Tim Newsome <tim@sifive.com>
Reviewed-on: http://openocd.zylin.com/4578
Tested-by: jenkins
Reviewed-by: Liviu Ionescu <ilg@livius.net>
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>

1 files changed, 310 insertions, 0 deletions

diff --git a/src/target/riscv/opcodes.h b/src/target/riscv/opcodes.h
new file mode 100644
index 00000000..dd51c809
--- /dev/null
+++ b/src/target/riscv/opcodes.h
@@ -0,0 +1,310 @@
+#include "encoding.h"
+
+#define ZERO	0
+#define T0      5
+#define S0      8
+#define S1      9
+
+static uint32_t bits(uint32_t value, unsigned int hi, unsigned int lo)
+{
+	return (value >> lo) & ((1 << (hi+1-lo)) - 1);
+}
+
+static uint32_t bit(uint32_t value, unsigned int b)
+{
+	return (value >> b) & 1;
+}
+
+static uint32_t jal(unsigned int rd, uint32_t imm) __attribute__ ((unused));
+static uint32_t jal(unsigned int rd, uint32_t imm)
+{
+	return (bit(imm, 20) << 31) |
+		(bits(imm, 10, 1) << 21) |
+		(bit(imm, 11) << 20) |
+		(bits(imm, 19, 12) << 12) |
+		(rd << 7) |
+		MATCH_JAL;
+}
+
+static uint32_t csrsi(unsigned int csr, uint16_t imm) __attribute__ ((unused));
+static uint32_t csrsi(unsigned int csr, uint16_t imm)
+{
+	return (csr << 20) |
+		(bits(imm, 4, 0) << 15) |
+		MATCH_CSRRSI;
+}
+
+static uint32_t sw(unsigned int src, unsigned int base, uint16_t offset) __attribute__ ((unused));
+static uint32_t sw(unsigned int src, unsigned int base, uint16_t offset)
+{
+	return (bits(offset, 11, 5) << 25) |
+		(src << 20) |
+		(base << 15) |
+		(bits(offset, 4, 0) << 7) |
+		MATCH_SW;
+}
+
+static uint32_t sd(unsigned int src, unsigned int base, uint16_t offset) __attribute__ ((unused));
+static uint32_t sd(unsigned int src, unsigned int base, uint16_t offset)
+{
+	return (bits(offset, 11, 5) << 25) |
+		(src << 20) |
+		(base << 15) |
+		(bits(offset, 4, 0) << 7) |
+		MATCH_SD;
+}
+
+static uint32_t sh(unsigned int src, unsigned int base, uint16_t offset) __attribute__ ((unused));
+static uint32_t sh(unsigned int src, unsigned int base, uint16_t offset)
+{
+	return (bits(offset, 11, 5) << 25) |
+		(src << 20) |
+		(base << 15) |
+		(bits(offset, 4, 0) << 7) |
+		MATCH_SH;
+}
+
+static uint32_t sb(unsigned int src, unsigned int base, uint16_t offset) __attribute__ ((unused));
+static uint32_t sb(unsigned int src, unsigned int base, uint16_t offset)
+{
+	return (bits(offset, 11, 5) << 25) |
+		(src << 20) |
+		(base << 15) |
+		(bits(offset, 4, 0) << 7) |
+		MATCH_SB;
+}
+
+static uint32_t ld(unsigned int rd, unsigned int base, uint16_t offset) __attribute__ ((unused));
+static uint32_t ld(unsigned int rd, unsigned int base, uint16_t offset)
+{
+	return (bits(offset, 11, 0) << 20) |
+		(base << 15) |
+		(bits(rd, 4, 0) << 7) |
+		MATCH_LD;
+}
+
+static uint32_t lw(unsigned int rd, unsigned int base, uint16_t offset) __attribute__ ((unused));
+static uint32_t lw(unsigned int rd, unsigned int base, uint16_t offset)
+{
+	return (bits(offset, 11, 0) << 20) |
+		(base << 15) |
+		(bits(rd, 4, 0) << 7) |
+		MATCH_LW;
+}
+
+static uint32_t lh(unsigned int rd, unsigned int base, uint16_t offset) __attribute__ ((unused));
+static uint32_t lh(unsigned int rd, unsigned int base, uint16_t offset)
+{
+	return (bits(offset, 11, 0) << 20) |
+		(base << 15) |
+		(bits(rd, 4, 0) << 7) |
+		MATCH_LH;
+}
+
+static uint32_t lb(unsigned int rd, unsigned int base, uint16_t offset) __attribute__ ((unused));
+static uint32_t lb(unsigned int rd, unsigned int base, uint16_t offset)
+{
+	return (bits(offset, 11, 0) << 20) |
+		(base << 15) |
+		(bits(rd, 4, 0) << 7) |
+		MATCH_LB;
+}
+
+static uint32_t csrw(unsigned int source, unsigned int csr) __attribute__ ((unused));
+static uint32_t csrw(unsigned int source, unsigned int csr)
+{
+	return (csr << 20) | (source << 15) | MATCH_CSRRW;
+}
+
+static uint32_t addi(unsigned int dest, unsigned int src, uint16_t imm) __attribute__ ((unused));
+static uint32_t addi(unsigned int dest, unsigned int src, uint16_t imm)
+{
+	return (bits(imm, 11, 0) << 20) |
+		(src << 15) |
+		(dest << 7) |
+		MATCH_ADDI;
+}
+
+static uint32_t csrr(unsigned int rd, unsigned int csr) __attribute__ ((unused));
+static uint32_t csrr(unsigned int rd, unsigned int csr)
+{
+	return (csr << 20) | (rd << 7) | MATCH_CSRRS;
+}
+
+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)
+{
+	return (csr << 20) | (rs << 15) | (rd << 7) | MATCH_CSRRS;
+}
+
+static uint32_t csrrw(unsigned int rd, unsigned int rs, unsigned int csr) __attribute__ ((unused));
+static uint32_t csrrw(unsigned int rd, unsigned int rs, unsigned int csr)
+{
+	return (csr << 20) | (rs << 15) | (rd << 7) | MATCH_CSRRW;
+}
+
+static uint32_t fsw(unsigned int src, unsigned int base, uint16_t offset) __attribute__ ((unused));
+static uint32_t fsw(unsigned int src, unsigned int base, uint16_t offset)
+{
+	return (bits(offset, 11, 5) << 25) |
+		(bits(src, 4, 0) << 20) |
+		(base << 15) |
+		(bits(offset, 4, 0) << 7) |
+		MATCH_FSW;
+}
+
+static uint32_t fsd(unsigned int src, unsigned int base, uint16_t offset) __attribute__ ((unused));
+static uint32_t fsd(unsigned int src, unsigned int base, uint16_t offset)
+{
+	return (bits(offset, 11, 5) << 25) |
+		(bits(src, 4, 0) << 20) |
+		(base << 15) |
+		(bits(offset, 4, 0) << 7) |
+		MATCH_FSD;
+}
+
+static uint32_t flw(unsigned int dest, unsigned int base, uint16_t offset) __attribute__ ((unused));
+static uint32_t flw(unsigned int dest, unsigned int base, uint16_t offset)
+{
+	return (bits(offset, 11, 0) << 20) |
+		(base << 15) |
+		(bits(dest, 4, 0) << 7) |
+		MATCH_FLW;
+}
+
+static uint32_t fld(unsigned int dest, unsigned int base, uint16_t offset) __attribute__ ((unused));
+static uint32_t fld(unsigned int dest, unsigned int base, uint16_t offset)
+{
+	return (bits(offset, 11, 0) << 20) |
+		(base << 15) |
+		(bits(dest, 4, 0) << 7) |
+		MATCH_FLD;
+}
+
+static uint32_t fmv_x_w(unsigned dest, unsigned src) __attribute__ ((unused));
+static uint32_t fmv_x_w(unsigned dest, unsigned src)
+{
+	return src << 15 |
+		dest << 7 |
+		MATCH_FMV_X_W;
+}
+
+static uint32_t fmv_x_d(unsigned dest, unsigned src) __attribute__ ((unused));
+static uint32_t fmv_x_d(unsigned dest, unsigned src)
+{
+	return src << 15 |
+		dest << 7 |
+		MATCH_FMV_X_D;
+}
+
+static uint32_t fmv_w_x(unsigned dest, unsigned src) __attribute__ ((unused));
+static uint32_t fmv_w_x(unsigned dest, unsigned src)
+{
+	return src << 15 |
+		dest << 7 |
+		MATCH_FMV_W_X;
+}
+
+static uint32_t fmv_d_x(unsigned dest, unsigned src) __attribute__ ((unused));
+static uint32_t fmv_d_x(unsigned dest, unsigned src)
+{
+	return src << 15 |
+		dest << 7 |
+		MATCH_FMV_D_X;
+}
+
+static uint32_t ebreak(void) __attribute__ ((unused));
+static uint32_t ebreak(void)
+{
+	return MATCH_EBREAK;
+}
+static uint32_t ebreak_c(void) __attribute__ ((unused));
+static uint32_t ebreak_c(void)
+{
+	return MATCH_C_EBREAK;
+}
+
+static uint32_t fence_i(void) __attribute__ ((unused));
+static uint32_t fence_i(void)
+{
+	return MATCH_FENCE_I;
+}
+
+static uint32_t lui(unsigned int dest, uint32_t imm) __attribute__ ((unused));
+static uint32_t lui(unsigned int dest, uint32_t imm)
+{
+	return (bits(imm, 19, 0) << 12) |
+		(dest << 7) |
+		MATCH_LUI;
+}
+
+/*
+static uint32_t csrci(unsigned int csr, uint16_t imm) __attribute__ ((unused));
+static uint32_t csrci(unsigned int csr, uint16_t imm)
+{
+  return (csr << 20) |
+    (bits(imm, 4, 0) << 15) |
+    MATCH_CSRRCI;
+}
+
+static uint32_t li(unsigned int dest, uint16_t imm) __attribute__ ((unused));
+static uint32_t li(unsigned int dest, uint16_t imm)
+{
+	return addi(dest, 0, imm);
+}
+
+static uint32_t fsd(unsigned int src, unsigned int base, uint16_t offset) __attribute__ ((unused));
+static uint32_t fsd(unsigned int src, unsigned int base, uint16_t offset)
+{
+  return (bits(offset, 11, 5) << 25) |
+    (bits(src, 4, 0) << 20) |
+    (base << 15) |
+    (bits(offset, 4, 0) << 7) |
+    MATCH_FSD;
+}
+
+static uint32_t ori(unsigned int dest, unsigned int src, uint16_t imm) __attribute__ ((unused));
+static uint32_t ori(unsigned int dest, unsigned int src, uint16_t imm)
+{
+  return (bits(imm, 11, 0) << 20) |
+    (src << 15) |
+    (dest << 7) |
+    MATCH_ORI;
+}
+
+static uint32_t nop(void) __attribute__ ((unused));
+static uint32_t nop(void)
+{
+  return addi(0, 0, 0);
+}
+*/
+
+static uint32_t xori(unsigned int dest, unsigned int src, uint16_t imm) __attribute__ ((unused));
+static uint32_t xori(unsigned int dest, unsigned int src, uint16_t imm)
+{
+	return (bits(imm, 11, 0) << 20) |
+		(src << 15) |
+		(dest << 7) |
+		MATCH_XORI;
+}
+
+static uint32_t srli(unsigned int dest, unsigned int src, uint8_t shamt) __attribute__ ((unused));
+static uint32_t srli(unsigned int dest, unsigned int src, uint8_t shamt)
+{
+	return (bits(shamt, 4, 0) << 20) |
+		(src << 15) |
+		(dest << 7) |
+		MATCH_SRLI;
+}
+
+static uint32_t fence(void) __attribute__((unused));
+static uint32_t fence(void)
+{
+	return MATCH_FENCE;
+}
+
+static uint32_t auipc(unsigned int dest) __attribute__((unused));
+static uint32_t auipc(unsigned int dest)
+{
+	return MATCH_AUIPC | (dest << 7);
+}