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tcg/s390x: Support raising sigbus for user-only

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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-08-04 00:08:57 +00:00
parent a3fb7c99c0
commit 1cd49868d4
2 changed files with 57 additions and 4 deletions
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59
tcg/s390x/tcg-target.c.inc
View File

@ -29,6 +29,7 @@
#error "unsupported code generation mode"
#endif
#include "../tcg-ldst.c.inc"
#include "../tcg-pool.c.inc"
#include "elf.h"
@ -136,6 +137,7 @@ typedef enum S390Opcode {
RI_OIHL = 0xa509,
RI_OILH = 0xa50a,
RI_OILL = 0xa50b,
RI_TMLL = 0xa701,
RIE_CGIJ = 0xec7c,
RIE_CGRJ = 0xec64,
@ -1804,8 +1806,6 @@ static void tcg_out_qemu_st_direct(TCGContext *s, MemOp opc, TCGReg data,
}
#if defined(CONFIG_SOFTMMU)
#include "../tcg-ldst.c.inc"
/* We're expecting to use a 20-bit negative offset on the tlb memory ops. */
QEMU_BUILD_BUG_ON(TLB_MASK_TABLE_OFS(0) > 0);
QEMU_BUILD_BUG_ON(TLB_MASK_TABLE_OFS(0) < -(1 << 19));
@ -1942,6 +1942,53 @@ static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
return true;
}
#else
static void tcg_out_test_alignment(TCGContext *s, bool is_ld,
TCGReg addrlo, unsigned a_bits)
{
unsigned a_mask = (1 << a_bits) - 1;
TCGLabelQemuLdst *l = new_ldst_label(s);
l->is_ld = is_ld;
l->addrlo_reg = addrlo;
/* We are expecting a_bits to max out at 7, much lower than TMLL. */
tcg_debug_assert(a_bits < 16);
tcg_out_insn(s, RI, TMLL, addrlo, a_mask);
tcg_out16(s, RI_BRC | (7 << 4)); /* CC in {1,2,3} */
l->label_ptr[0] = s->code_ptr;
s->code_ptr += 1;
l->raddr = tcg_splitwx_to_rx(s->code_ptr);
}
static bool tcg_out_fail_alignment(TCGContext *s, TCGLabelQemuLdst *l)
{
if (!patch_reloc(l->label_ptr[0], R_390_PC16DBL,
(intptr_t)tcg_splitwx_to_rx(s->code_ptr), 2)) {
return false;
}
tcg_out_mov(s, TCG_TYPE_TL, TCG_REG_R3, l->addrlo_reg);
tcg_out_mov(s, TCG_TYPE_PTR, TCG_REG_R2, TCG_AREG0);
/* "Tail call" to the helper, with the return address back inline. */
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R14, (uintptr_t)l->raddr);
tgen_gotoi(s, S390_CC_ALWAYS, (const void *)(l->is_ld ? helper_unaligned_ld
: helper_unaligned_st));
return true;
}
static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
{
return tcg_out_fail_alignment(s, l);
}
static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
{
return tcg_out_fail_alignment(s, l);
}
static void tcg_prepare_user_ldst(TCGContext *s, TCGReg *addr_reg,
TCGReg *index_reg, tcg_target_long *disp)
{
@ -1980,7 +2027,11 @@ static void tcg_out_qemu_ld(TCGContext* s, TCGReg data_reg, TCGReg addr_reg,
#else
TCGReg index_reg;
tcg_target_long disp;
unsigned a_bits = get_alignment_bits(opc);
if (a_bits) {
tcg_out_test_alignment(s, true, addr_reg, a_bits);
}
tcg_prepare_user_ldst(s, &addr_reg, &index_reg, &disp);
tcg_out_qemu_ld_direct(s, opc, data_reg, addr_reg, index_reg, disp);
#endif
@ -2007,7 +2058,11 @@ static void tcg_out_qemu_st(TCGContext* s, TCGReg data_reg, TCGReg addr_reg,
#else
TCGReg index_reg;
tcg_target_long disp;
unsigned a_bits = get_alignment_bits(opc);
if (a_bits) {
tcg_out_test_alignment(s, false, addr_reg, a_bits);
}
tcg_prepare_user_ldst(s, &addr_reg, &index_reg, &disp);
tcg_out_qemu_st_direct(s, opc, data_reg, addr_reg, index_reg, disp);
#endif

2
tcg/s390x/tcg-target.h
View File

@ -178,9 +178,7 @@ static inline void tb_target_set_jmp_target(uintptr_t tc_ptr, uintptr_t jmp_rx,
/* no need to flush icache explicitly */
}
#ifdef CONFIG_SOFTMMU
#define TCG_TARGET_NEED_LDST_LABELS
#endif
#define TCG_TARGET_NEED_POOL_LABELS
#endif