interesting
/
riscv-openocd
mirror of https://github.com/riscv/riscv-openocd.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Deal with vlenb being unreadable. (#458) 

Instead of exiting during examine(), spit out a warning, and don't
expose the vector data registers. We do provide access to the vector
CSRs, because maybe they do work? It's just that we have no idea what
the size of the data registers is.

Change-Id: I6e9ffeb242e2e22fc62cb1b50782c2efb4ace0bd
This commit is contained in:
Tim Newsome 2020-03-26 09:08:56 -07:00 committed by GitHub
parent 548790fefc
commit 5b2426a4b2
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
src/target/riscv/riscv-013.c
View File

@ -1541,8 +1541,12 @@ static int discover_vlenb(struct target *target, int hartid)
RISCV_INFO(r);
riscv_reg_t vlenb;
if (register_read(target, &vlenb, GDB_REGNO_VLENB) != ERROR_OK)
return ERROR_FAIL;
if (register_read(target, &vlenb, GDB_REGNO_VLENB) != ERROR_OK) {
LOG_WARNING("Couldn't read vlenb for %s; vector register access won't "
"work.", target_name(target));
r->vlenb[hartid] = 0;
return ERROR_OK;
}
r->vlenb[hartid] = vlenb;
LOG_INFO("hart %d: Vector support with vlenb=%d", hartid, r->vlenb[hartid]);

2
src/target/riscv/riscv.c
View File

@ -4023,7 +4023,7 @@ int riscv_init_registers(struct target *target)
} else if (number >= GDB_REGNO_V0 && number <= GDB_REGNO_V31) {
r->caller_save = false;
r->exist = riscv_supports_extension(target, hartid, 'V');
r->exist = riscv_supports_extension(target, hartid, 'V') && info->vlenb[hartid];
r->size = info->vlenb[hartid] * 8;
sprintf(reg_name, "v%d", number - GDB_REGNO_V0);
r->group = "vector";

1
src/target/riscv/riscv.h
View File

@ -75,6 +75,7 @@ typedef struct {
/* It's possible that each core has a different supported ISA set. */
int xlen[RISCV_MAX_HARTS];
riscv_reg_t misa[RISCV_MAX_HARTS];
/* Cached value of vlenb. 0 if vlenb is not readable for some reason. */
unsigned vlenb[RISCV_MAX_HARTS];
/* The number of triggers per hart. */