diff options
Diffstat (limited to 'src/target/riscv/program.h')
-rw-r--r-- | src/target/riscv/program.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/src/target/riscv/program.h b/src/target/riscv/program.h new file mode 100644 index 00000000..d641be1b --- /dev/null +++ b/src/target/riscv/program.h @@ -0,0 +1,75 @@ +#ifndef TARGET__RISCV__PROGRAM_H +#define TARGET__RISCV__PROGRAM_H + +#include "riscv.h" + +#define RISCV_MAX_DEBUG_BUFFER_SIZE 32 +#define RISCV_REGISTER_COUNT 32 +#define RISCV_DSCRATCH_COUNT 2 + +/* The various RISC-V debug specifications all revolve around setting up + * program buffers and executing them on the target. This structure contains a + * single program, which can then be executed on targets. */ +struct riscv_program { + struct target *target; + + uint32_t debug_buffer[RISCV_MAX_DEBUG_BUFFER_SIZE]; + + /* Number of 32-bit instructions in the program. */ + size_t instruction_count; + + /* Side effects of executing this program. These must be accounted for + * in order to maintain correct executing of the target system. */ + bool writes_xreg[RISCV_REGISTER_COUNT]; + + /* XLEN on the target. */ + int target_xlen; +}; + +/* Initializes a program with the header. */ +int riscv_program_init(struct riscv_program *p, struct target *t); + +/* Write the program to the program buffer. */ +int riscv_program_write(struct riscv_program *program); + +/* Executes a program, returning 0 if the program successfully executed. Note + * that this may cause registers to be saved or restored, which could result to + * calls to things like riscv_save_register which itself could require a + * program to execute. That's OK, just make sure this eventually terminates. + * */ +int riscv_program_exec(struct riscv_program *p, struct target *t); +int riscv_program_load(struct riscv_program *p, struct target *t); + +/* Clears a program, removing all the state associated with it. */ +int riscv_program_clear(struct riscv_program *p, struct target *t); + +/* A lower level interface, you shouldn't use this unless you have a reason. */ +int riscv_program_insert(struct riscv_program *p, riscv_insn_t i); + +/* There is hardware support for saving at least one register. This register + * doesn't need to be saved/restored the usual way, which is useful during + * early initialization when we can't save/restore arbitrary registerrs to host + * memory. */ +int riscv_program_save_to_dscratch(struct riscv_program *p, enum gdb_regno to_save); + +/* Helpers to assembly various instructions. Return 0 on success. These might + * assembly into a multi-instruction sequence that overwrites some other + * register, but those will be properly saved and restored. */ +int riscv_program_lwr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno a, int o); +int riscv_program_lhr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno a, int o); +int riscv_program_lbr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno a, int o); + +int riscv_program_swr(struct riscv_program *p, enum gdb_regno s, enum gdb_regno a, int o); +int riscv_program_shr(struct riscv_program *p, enum gdb_regno s, enum gdb_regno a, int o); +int riscv_program_sbr(struct riscv_program *p, enum gdb_regno s, enum gdb_regno a, int o); + +int riscv_program_csrr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno csr); +int riscv_program_csrw(struct riscv_program *p, enum gdb_regno s, enum gdb_regno csr); + +int riscv_program_fence_i(struct riscv_program *p); +int riscv_program_fence(struct riscv_program *p); +int riscv_program_ebreak(struct riscv_program *p); + +int riscv_program_addi(struct riscv_program *p, enum gdb_regno d, enum gdb_regno s, int16_t i); + +#endif |