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Muck with mstatus to always be able to read FPRs 

Change-Id: I7ff8bde4578c9ddd175c5cca370295c790cfbba7
rbb_cleanup
Tim Newsome 2018-01-03 12:23:22 -08:00
parent fd506fa839
commit 29c7a76708
1 changed files with 13 additions and 1 deletions
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14
src/target/riscv/riscv-013.c
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@ -1003,8 +1003,15 @@ static int register_read_direct(struct target *target, uint64_t *value, uint32_t
/* Write program to move data into s0. */
uint64_t mstatus;
if (number >= GDB_REGNO_FPR0 && number <= GDB_REGNO_FPR31) {
/* TODO: Possibly set F in mstatus. */
if (register_read_direct(target, &mstatus, GDB_REGNO_MSTATUS) != ERROR_OK)
return ERROR_FAIL;
if ((mstatus & MSTATUS_FS) == 0)
if (register_write_direct(target, GDB_REGNO_MSTATUS,
set_field(mstatus, MSTATUS_FS, 1)) != ERROR_OK)
return ERROR_FAIL;
if (riscv_supports_extension(target, 'D') && riscv_xlen(target) < 64) {
/* There are no instructions to move all the bits from a
* register, so we need to use some scratch RAM. */
@ -1042,6 +1049,11 @@ static int register_read_direct(struct target *target, uint64_t *value, uint32_t
return ERROR_FAIL;
}
if (number >= GDB_REGNO_FPR0 && number <= GDB_REGNO_FPR31 &&
(mstatus & MSTATUS_FS) == 0)
if (register_write_direct(target, GDB_REGNO_MSTATUS, mstatus) != ERROR_OK)
return ERROR_FAIL;
/* Restore S0. */
if (register_write_direct(target, GDB_REGNO_S0, s0) != ERROR_OK)
return ERROR_FAIL;