[Pdbg] [PATCH 06/19] libpdbg: Add in mtocrf and putcr function

[Rashmica Gupta]

Signed-off-by: Rashmica Gupta <rashmica.g at gmail.com>
---
 libpdbg/chip.c       | 26 ++++++++++++++++++++++++++
 libpdbg/libpdbg.h    |  1 +
 libpdbg/operations.h |  1 +
 3 files changed, 28 insertions(+)

diff --git a/libpdbg/chip.c b/libpdbg/chip.c
index 31c8c80..7a93ab6 100644
--- a/libpdbg/chip.c
+++ b/libpdbg/chip.c
@@ -52,6 +52,20 @@ static uint64_t mfocrf(uint64_t reg, uint64_t cr)
 	return MFOCRF_OPCODE | (reg << 21) | (1U << (12 + cr));
 }
 
+static uint64_t mtocrf(uint64_t cr, uint64_t reg)
+{
+	if (reg > 31) {
+		PR_ERROR("Invalid register specified for mfocrf\n");
+		exit(1);
+	}
+	if (cr > 7) {
+		PR_ERROR("Invalid CR field specified\n");
+		exit(1);
+	}
+
+	return MTOCRF_OPCODE | (reg << 21) | (1U << (12 + cr));
+}
+
 static uint64_t mfnia(uint64_t reg)
 {
 	if (reg > 31)
@@ -303,6 +317,18 @@ int ram_getcr(struct pdbg_target *thread, uint32_t *value)
 	return 0;
 }
 
+int ram_putcr(struct pdbg_target *thread, uint32_t value)
+{
+	uint64_t opcodes[] = {mfspr(0, 277), mtocrf(0, 0), mtocrf(1, 0),
+			      mtocrf(2, 0), mtocrf(3, 0), mtocrf(4, 0),
+			      mtocrf(5, 0), mtocrf(6, 0), mtocrf(7, 0)};
+	uint64_t results[] = {value};
+
+	CHECK_ERR(ram_instructions(thread, opcodes, results, ARRAY_SIZE(opcodes), 0));
+
+	return 0;
+}
+
 int ram_putmsr(struct pdbg_target *thread, uint64_t value)
 {
 	uint64_t opcodes[] = {mfspr(0, 277), mtmsr(0)};
diff --git a/libpdbg/libpdbg.h b/libpdbg/libpdbg.h
index 1239bba..25b2afd 100644
--- a/libpdbg/libpdbg.h
+++ b/libpdbg/libpdbg.h
@@ -143,6 +143,7 @@ int ram_putspr(struct pdbg_target *target, int spr, uint64_t val);
 int ram_putgpr(struct pdbg_target *target, int spr, uint64_t val);
 int ram_getmsr(struct pdbg_target *target, uint64_t *val);
 int ram_getcr(struct pdbg_target *thread,  uint32_t *value);
+int ram_putcr(struct pdbg_target *thread,  uint32_t value);
 int ram_getnia(struct pdbg_target *target, uint64_t *val);
 int ram_getspr(struct pdbg_target *target, int spr, uint64_t *val);
 int ram_getgpr(struct pdbg_target *target, int gpr, uint64_t *val);
diff --git a/libpdbg/operations.h b/libpdbg/operations.h
index 4735c55..a0ed2cd 100644
--- a/libpdbg/operations.h
+++ b/libpdbg/operations.h
@@ -65,6 +65,7 @@
 #define MFSPR_OPCODE 0x7c0002a6UL
 #define MTSPR_OPCODE 0x7c0003a6UL
 #define MFOCRF_OPCODE 0x7c100026UL
+#define MTOCRF_OPCODE 0x7C100120UL
 #define MFSPR_MASK (MFSPR_OPCODE | ((0x1f) << 16) | ((0x3e0) << 6))
 #define MFXER_OPCODE (MFSPR_OPCODE | ((1 & 0x1f) << 16) | ((1 & 0x3e0) << 6))
 #define MTXER_OPCODE (MTSPR_OPCODE | ((1 & 0x1f) << 16) | ((1 & 0x3e0) << 6))
-- 
2.14.4