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target/arm: Implement GCSSS1

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Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20251008215613.300150-54-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson
2025-10-10 13:19:10 +01:00
committed by Peter Maydell
parent a94b6aab8e
commit 22d20e3804
3 changed files with 34 additions and 0 deletions
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target/arm/cpregs-gcs.c
+3
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@@ -129,6 +129,9 @@ static const ARMCPRegInfo gcs_reginfo[] = {
{ .name = "GCSPOPM", .state = ARM_CP_STATE_AA64,
.opc0 = 1, .opc1 = 3, .crn = 7, .crm = 7, .opc2 = 1,
.access = PL0_R, .type = ARM_CP_GCSPOPM },
{ .name = "GCSSS1", .state = ARM_CP_STATE_AA64,
.opc0 = 1, .opc1 = 3, .crn = 7, .crm = 7, .opc2 = 2,
.access = PL0_W, .type = ARM_CP_GCSSS1 },
{ .name = "GCSPUSHX", .state = ARM_CP_STATE_AA64,
.opc0 = 1, .opc1 = 0, .crn = 7, .crm = 7, .opc2 = 4,
.access = PL1_W, .accessfn = access_gcspushx, .fgt = FGT_NGCSEPP,
target/arm/cpregs.h
+1
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@@ -53,6 +53,7 @@ enum {
ARM_CP_GCSPUSHX = 0x000a,
ARM_CP_GCSPOPX = 0x000b,
ARM_CP_GCSPOPCX = 0x000c,
ARM_CP_GCSSS1 = 0x000d,
/* Flag: reads produce resetvalue; writes ignored. */
ARM_CP_CONST = 1 << 4,
target/arm/tcg/translate-a64.c
+30
View File
@@ -2643,6 +2643,31 @@ static void gen_gcspopx(DisasContext *s)
tcg_gen_addi_i64(gcspr, addr, 8);
}
static void gen_gcsss1(DisasContext *s, int rt)
{
TCGv_i64 gcspr = cpu_gcspr[s->current_el];
int mmuidx = core_gcs_mem_index(s->mmu_idx);
MemOp mop = finalize_memop(s, MO_64 | MO_ALIGN);
TCGv_i64 inptr = cpu_reg(s, rt);
TCGv_i64 cmp = tcg_temp_new_i64();
TCGv_i64 new = tcg_temp_new_i64();
TCGv_i64 old = tcg_temp_new_i64();
TCGLabel *fail_label =
delay_exception(s, EXCP_UDEF, syn_gcs_data_check(GCS_IT_GCSSS1, rt));
/* Compute the valid cap entry that the new stack must have. */
tcg_gen_deposit_i64(cmp, inptr, tcg_constant_i64(1), 0, 12);
/* Compute the in-progress cap entry for the old stack. */
tcg_gen_deposit_i64(new, gcspr, tcg_constant_i64(5), 0, 3);
/* Swap the valid cap the with the in-progress cap. */
tcg_gen_atomic_cmpxchg_i64(old, inptr, cmp, new, mmuidx, mop);
tcg_gen_brcond_i64(TCG_COND_NE, old, cmp, fail_label);
/* The new stack had a valid cap: change gcspr. */
tcg_gen_andi_i64(gcspr, inptr, ~7);
}
/*
* Look up @key, returning the cpreg, which must exist.
* Additionally, the new cpreg must also be accessible.
@@ -2984,6 +3009,11 @@ static void handle_sys(DisasContext *s, bool isread,
gen_gcspopx(s);
}
return;
case ARM_CP_GCSSS1:
if (s->gcs_en) {
gen_gcsss1(s, rt);
}
return;
default:
g_assert_not_reached();
}