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tcg/ppc: Support raising sigbus for user-only 

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-08-03 22:08:55 +00:00
parent f85ab3d2e5
commit 8605cbcdee
2 changed files with 90 additions and 10 deletions
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98
tcg/ppc/tcg-target.c.inc
View File

@ -24,6 +24,7 @@
#include "elf.h"
#include "../tcg-pool.c.inc"
#include "../tcg-ldst.c.inc"
/*
* Standardize on the _CALL_FOO symbols used by GCC:
@ -1881,7 +1882,8 @@ void tb_target_set_jmp_target(uintptr_t tc_ptr, uintptr_t jmp_rx,
}
}
static void tcg_out_call(TCGContext *s, const tcg_insn_unit *target)
static void tcg_out_call_int(TCGContext *s, int lk,
const tcg_insn_unit *target)
{
#ifdef _CALL_AIX
/* Look through the descriptor. If the branch is in range, and we
@ -1892,7 +1894,7 @@ static void tcg_out_call(TCGContext *s, const tcg_insn_unit *target)
if (in_range_b(diff) && toc == (uint32_t)toc) {
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_TMP1, toc);
tcg_out_b(s, LK, tgt);
tcg_out_b(s, lk, tgt);
} else {
/* Fold the low bits of the constant into the addresses below. */
intptr_t arg = (intptr_t)target;
@ -1907,7 +1909,7 @@ static void tcg_out_call(TCGContext *s, const tcg_insn_unit *target)
tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_R0, TCG_REG_TMP1, ofs);
tcg_out32(s, MTSPR | RA(TCG_REG_R0) | CTR);
tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_R2, TCG_REG_TMP1, ofs + SZP);
tcg_out32(s, BCCTR | BO_ALWAYS | LK);
tcg_out32(s, BCCTR | BO_ALWAYS | lk);
}
#elif defined(_CALL_ELF) && _CALL_ELF == 2
intptr_t diff;
@ -1921,16 +1923,21 @@ static void tcg_out_call(TCGContext *s, const tcg_insn_unit *target)
diff = tcg_pcrel_diff(s, target);
if (in_range_b(diff)) {
tcg_out_b(s, LK, target);
tcg_out_b(s, lk, target);
} else {
tcg_out32(s, MTSPR | RS(TCG_REG_R12) | CTR);
tcg_out32(s, BCCTR | BO_ALWAYS | LK);
tcg_out32(s, BCCTR | BO_ALWAYS | lk);
}
#else
tcg_out_b(s, LK, target);
tcg_out_b(s, lk, target);
#endif
}
static void tcg_out_call(TCGContext *s, const tcg_insn_unit *target)
{
tcg_out_call_int(s, LK, target);
}
static const uint32_t qemu_ldx_opc[(MO_SSIZE + MO_BSWAP) + 1] = {
[MO_UB] = LBZX,
[MO_UW] = LHZX,
@ -1960,8 +1967,6 @@ static const uint32_t qemu_exts_opc[4] = {
};
#if defined (CONFIG_SOFTMMU)
#include "../tcg-ldst.c.inc"
/* helper signature: helper_ld_mmu(CPUState *env, target_ulong addr,
* int mmu_idx, uintptr_t ra)
*/
@ -2227,6 +2232,71 @@ static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
tcg_out_b(s, 0, lb->raddr);
return true;
}
#else
static void tcg_out_test_alignment(TCGContext *s, bool is_ld, TCGReg addrlo,
TCGReg addrhi, unsigned a_bits)
{
unsigned a_mask = (1 << a_bits) - 1;
TCGLabelQemuLdst *label = new_ldst_label(s);
label->is_ld = is_ld;
label->addrlo_reg = addrlo;
label->addrhi_reg = addrhi;
/* We are expecting a_bits to max out at 7, much lower than ANDI. */
tcg_debug_assert(a_bits < 16);
tcg_out32(s, ANDI | SAI(addrlo, TCG_REG_R0, a_mask));
label->label_ptr[0] = s->code_ptr;
tcg_out32(s, BC | BI(0, CR_EQ) | BO_COND_FALSE | LK);
label->raddr = tcg_splitwx_to_rx(s->code_ptr);
}
static bool tcg_out_fail_alignment(TCGContext *s, TCGLabelQemuLdst *l)
{
if (!reloc_pc14(l->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
return false;
}
if (TCG_TARGET_REG_BITS < TARGET_LONG_BITS) {
TCGReg arg = TCG_REG_R4;
#ifdef TCG_TARGET_CALL_ALIGN_ARGS
arg |= 1;
#endif
if (l->addrlo_reg != arg) {
tcg_out_mov(s, TCG_TYPE_I32, arg, l->addrhi_reg);
tcg_out_mov(s, TCG_TYPE_I32, arg + 1, l->addrlo_reg);
} else if (l->addrhi_reg != arg + 1) {
tcg_out_mov(s, TCG_TYPE_I32, arg + 1, l->addrlo_reg);
tcg_out_mov(s, TCG_TYPE_I32, arg, l->addrhi_reg);
} else {
tcg_out_mov(s, TCG_TYPE_I32, TCG_REG_R0, arg);
tcg_out_mov(s, TCG_TYPE_I32, arg, arg + 1);
tcg_out_mov(s, TCG_TYPE_I32, arg + 1, TCG_REG_R0);
}
} else {
tcg_out_mov(s, TCG_TYPE_TL, TCG_REG_R4, l->addrlo_reg);
}
tcg_out_mov(s, TCG_TYPE_TL, TCG_REG_R3, TCG_AREG0);
/* "Tail call" to the helper, with the return address back inline. */
tcg_out_call_int(s, 0, (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);
}
#endif /* SOFTMMU */
static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, bool is_64)
@ -2238,6 +2308,8 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, bool is_64)
#ifdef CONFIG_SOFTMMU
int mem_index;
tcg_insn_unit *label_ptr;
#else
unsigned a_bits;
#endif
datalo = *args++;
@ -2258,6 +2330,10 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, bool is_64)
rbase = TCG_REG_R3;
#else /* !CONFIG_SOFTMMU */
a_bits = get_alignment_bits(opc);
if (a_bits) {
tcg_out_test_alignment(s, true, addrlo, addrhi, a_bits);
}
rbase = guest_base ? TCG_GUEST_BASE_REG : 0;
if (TCG_TARGET_REG_BITS > TARGET_LONG_BITS) {
tcg_out_ext32u(s, TCG_REG_TMP1, addrlo);
@ -2313,6 +2389,8 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is_64)
#ifdef CONFIG_SOFTMMU
int mem_index;
tcg_insn_unit *label_ptr;
#else
unsigned a_bits;
#endif
datalo = *args++;
@ -2333,6 +2411,10 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is_64)
rbase = TCG_REG_R3;
#else /* !CONFIG_SOFTMMU */
a_bits = get_alignment_bits(opc);
if (a_bits) {
tcg_out_test_alignment(s, false, addrlo, addrhi, a_bits);
}
rbase = guest_base ? TCG_GUEST_BASE_REG : 0;
if (TCG_TARGET_REG_BITS > TARGET_LONG_BITS) {
tcg_out_ext32u(s, TCG_REG_TMP1, addrlo);

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

@ -182,9 +182,7 @@ void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t, uintptr_t);
#define TCG_TARGET_DEFAULT_MO (0)
#define TCG_TARGET_HAS_MEMORY_BSWAP 1
#ifdef CONFIG_SOFTMMU
#define TCG_TARGET_NEED_LDST_LABELS
#endif
#define TCG_TARGET_NEED_POOL_LABELS
#endif