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tcg/arm: Adjust constraints on qemu_ld/st 

Always reserve r3 for tlb softmmu lookup.  Fix a bug in user-only
ALL_QLDST_REGS, in that r14 is clobbered by the BLNE that leads
to the misaligned trap.  Remove r0+r1 from user-only ALL_QLDST_REGS;
I believe these had been reserved for bswap, which we no longer
perform during qemu_st.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-04-24 12:31:46 +01:00
parent 9161e9ae2e
commit 7212812263
3 changed files with 18 additions and 26 deletions
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16
tcg/arm/tcg-target-con-set.h
View File

@ -12,19 +12,19 @@
C_O0_I1(r)
C_O0_I2(r, r)
C_O0_I2(r, rIN)
C_O0_I2(s, s)
C_O0_I2(q, q)
C_O0_I2(w, r)
C_O0_I3(s, s, s)
C_O0_I3(S, p, s)
C_O0_I3(q, q, q)
C_O0_I3(Q, p, q)
C_O0_I4(r, r, rI, rI)
C_O0_I4(S, p, s, s)
C_O1_I1(r, l)
C_O0_I4(Q, p, q, q)
C_O1_I1(r, q)
C_O1_I1(r, r)
C_O1_I1(w, r)
C_O1_I1(w, w)
C_O1_I1(w, wr)
C_O1_I2(r, 0, rZ)
C_O1_I2(r, l, l)
C_O1_I2(r, q, q)
C_O1_I2(r, r, r)
C_O1_I2(r, r, rI)
C_O1_I2(r, r, rIK)
@ -39,8 +39,8 @@ C_O1_I2(w, w, wZ)
C_O1_I3(w, w, w, w)
C_O1_I4(r, r, r, rI, rI)
C_O1_I4(r, r, rIN, rIK, 0)
C_O2_I1(e, p, l)
C_O2_I2(e, p, l, l)
C_O2_I1(e, p, q)
C_O2_I2(e, p, q, q)
C_O2_I2(r, r, r, r)
C_O2_I4(r, r, r, r, rIN, rIK)
C_O2_I4(r, r, rI, rI, rIN, rIK)

5
tcg/arm/tcg-target-con-str.h
View File

@ -10,9 +10,8 @@
*/
REGS('e', ALL_GENERAL_REGS & 0x5555) /* even regs */
REGS('r', ALL_GENERAL_REGS)
REGS('l', ALL_QLOAD_REGS)
REGS('s', ALL_QSTORE_REGS)
REGS('S', ALL_QSTORE_REGS & 0x5555) /* even qstore */
REGS('q', ALL_QLDST_REGS)
REGS('Q', ALL_QLDST_REGS & 0x5555) /* even qldst */
REGS('w', ALL_VECTOR_REGS)
/*

23
tcg/arm/tcg-target.c.inc
View File

@ -353,23 +353,16 @@ static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
#define ALL_VECTOR_REGS 0xffff0000u
/*
* r0-r2 will be overwritten when reading the tlb entry (softmmu only)
* and r0-r1 doing the byte swapping, so don't use these.
* r3 is removed for softmmu to avoid clashes with helper arguments.
* r0-r3 will be overwritten when reading the tlb entry (softmmu only);
* r14 will be overwritten by the BLNE branching to the slow path.
*/
#ifdef CONFIG_SOFTMMU
#define ALL_QLOAD_REGS \
#define ALL_QLDST_REGS \
(ALL_GENERAL_REGS & ~((1 << TCG_REG_R0) | (1 << TCG_REG_R1) | \
(1 << TCG_REG_R2) | (1 << TCG_REG_R3) | \
(1 << TCG_REG_R14)))
#define ALL_QSTORE_REGS \
(ALL_GENERAL_REGS & ~((1 << TCG_REG_R0) | (1 << TCG_REG_R1) | \
(1 << TCG_REG_R2) | (1 << TCG_REG_R14) | \
((TARGET_LONG_BITS == 64) << TCG_REG_R3)))
#else
#define ALL_QLOAD_REGS ALL_GENERAL_REGS
#define ALL_QSTORE_REGS \
(ALL_GENERAL_REGS & ~((1 << TCG_REG_R0) | (1 << TCG_REG_R1)))
#define ALL_QLDST_REGS (ALL_GENERAL_REGS & ~(1 << TCG_REG_R14))
#endif
/*
@ -2203,13 +2196,13 @@ static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode op)
return C_O1_I4(r, r, r, rI, rI);
case INDEX_op_qemu_ld_i32:
return TARGET_LONG_BITS == 32 ? C_O1_I1(r, l) : C_O1_I2(r, l, l);
return TARGET_LONG_BITS == 32 ? C_O1_I1(r, q) : C_O1_I2(r, q, q);
case INDEX_op_qemu_ld_i64:
return TARGET_LONG_BITS == 32 ? C_O2_I1(e, p, l) : C_O2_I2(e, p, l, l);
return TARGET_LONG_BITS == 32 ? C_O2_I1(e, p, q) : C_O2_I2(e, p, q, q);
case INDEX_op_qemu_st_i32:
return TARGET_LONG_BITS == 32 ? C_O0_I2(s, s) : C_O0_I3(s, s, s);
return TARGET_LONG_BITS == 32 ? C_O0_I2(q, q) : C_O0_I3(q, q, q);
case INDEX_op_qemu_st_i64:
return TARGET_LONG_BITS == 32 ? C_O0_I3(S, p, s) : C_O0_I4(S, p, s, s);
return TARGET_LONG_BITS == 32 ? C_O0_I3(Q, p, q) : C_O0_I4(Q, p, q, q);
case INDEX_op_st_vec:
return C_O0_I2(w, r);