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Add support for the vmsr and vmrs instructions. This supports the system

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level version of the instructions. When used in userland the hardware only
allows us to read/write FPSCR.
This commit is contained in:
Andrew Turner 2013-03-18 08:22:35 +00:00
parent 90ab443e31
commit e8dde80b1d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=248460
1 changed files with 66 additions and 0 deletions
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66
contrib/binutils/gas/config/tc-arm.c
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@ -651,6 +651,7 @@ struct asm_opcode
#define BAD_ARGS _("bad arguments to instruction")
#define BAD_PC _("r15 not allowed here")
#define BAD_SP _("r13 not allowed here")
#define BAD_COND _("instruction cannot be conditional")
#define BAD_OVERLAP _("registers may not be the same")
#define BAD_HIREG _("lo register required")
@ -659,6 +660,7 @@ struct asm_opcode
#define BAD_BRANCH _("branch must be last instruction in IT block")
#define BAD_NOT_IT _("instruction not allowed in IT block")
#define BAD_FPU _("selected FPU does not support instruction")
#define BAD_VMRS _("APSR_nzcv may only be used with fpscr")
static struct hash_control *arm_ops_hsh;
static struct hash_control *arm_cond_hsh;
@ -7095,6 +7097,68 @@ do_vfp_nsyn_msr (void)
return SUCCESS;
}
static int
do_vfp_vmrs (void)
{
int rt;
/* The destination register can be r0-r14 or APSR_nzcv */
if (inst.operands[0].reg > 14)
{
inst.error = BAD_PC;
return FAIL;
}
/* If the destination is r13 and not in ARM mode then unprefictable */
if (thumb_mode && inst.operands[0].reg == REG_SP)
{
inst.error = BAD_SP;
return FAIL;
}
/* If the destination is APSR_nzcv */
if (inst.operands[0].isvec && inst.operands[1].reg != 1)
{
inst.error = BAD_VMRS;
return FAIL;
}
if (inst.operands[0].isvec)
rt = 15;
else
rt = inst.operands[0].reg;
/* Or in the registers to use */
inst.instruction |= rt << 12;
inst.instruction |= inst.operands[1].reg << 16;
return SUCCESS;
}
static int
do_vfp_vmsr (void)
{
/* The destination register can be r0-r14 or APSR_nzcv */
if (inst.operands[1].reg > 14)
{
inst.error = BAD_PC;
return FAIL;
}
/* If the destination is r13 and not in ARM mode then unprefictable */
if (thumb_mode && inst.operands[0].reg == REG_SP)
{
inst.error = BAD_SP;
return FAIL;
}
/* Or in the registers to use */
inst.instruction |= inst.operands[1].reg << 12;
inst.instruction |= inst.operands[0].reg << 16;
return SUCCESS;
}
static void
do_mrs (void)
{
@ -15726,6 +15790,8 @@ static const struct asm_opcode insns[] =
cCE(ftouizs, ebc0ac0, 2, (RVS, RVS), vfp_sp_monadic),
cCE(fmrx, ef00a10, 2, (RR, RVC), rd_rn),
cCE(fmxr, ee00a10, 2, (RVC, RR), rn_rd),
cCE(vmrs, ef00a10, 2, (APSR_RR, RVC), vfp_vmrs),
cCE(vmsr, ee00a10, 2, (RVC, RR), vfp_vmsr),
/* Memory operations. */
cCE(flds, d100a00, 2, (RVS, ADDRGLDC), vfp_sp_ldst),