From 7b3ecf16c81c16eb3cf171b0bd63c08f1a5dd942 Mon Sep 17 00:00:00 2001 From: Daniel Henrique Barboza Date: Sun, 17 Oct 2021 22:01:21 -0300 Subject: [PATCH] target/ppc: add user read/write functions for MMCR2 Similar to the previous patch, let's add problem state read/write access to the MMCR2 SPR, which is also a group A PMU SPR that needs to be filtered to be read/written by userspace. Signed-off-by: Daniel Henrique Barboza Message-Id: <20211018010133.315842-4-danielhb413@gmail.com> Signed-off-by: David Gibson --- target/ppc/cpu.h | 9 +++ target/ppc/cpu_init.c | 2 +- target/ppc/power8-pmu-regs.c.inc | 98 ++++++++++++++++++++++++++++---- target/ppc/spr_tcg.h | 2 + 4 files changed, 99 insertions(+), 12 deletions(-) diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h index 0bd008f4b8..0472ec9154 100644 --- a/target/ppc/cpu.h +++ b/target/ppc/cpu.h @@ -353,6 +353,15 @@ typedef struct ppc_v3_pate_t { #define MMCR0_PMCC1 PPC_BIT(45) /* PMC Control bit 1 */ /* MMCR0 userspace r/w mask */ #define MMCR0_UREG_MASK (MMCR0_FC | MMCR0_PMAO | MMCR0_PMAE) +/* MMCR2 userspace r/w mask */ +#define MMCR2_FC1P0 PPC_BIT(1) /* MMCR2 FCnP0 for PMC1 */ +#define MMCR2_FC2P0 PPC_BIT(10) /* MMCR2 FCnP0 for PMC2 */ +#define MMCR2_FC3P0 PPC_BIT(19) /* MMCR2 FCnP0 for PMC3 */ +#define MMCR2_FC4P0 PPC_BIT(28) /* MMCR2 FCnP0 for PMC4 */ +#define MMCR2_FC5P0 PPC_BIT(37) /* MMCR2 FCnP0 for PMC5 */ +#define MMCR2_FC6P0 PPC_BIT(46) /* MMCR2 FCnP0 for PMC6 */ +#define MMCR2_UREG_MASK (MMCR2_FC1P0 | MMCR2_FC2P0 | MMCR2_FC3P0 | \ + MMCR2_FC4P0 | MMCR2_FC5P0 | MMCR2_FC6P0) /* LPCR bits */ #define LPCR_VPM0 PPC_BIT(0) diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c index 375bdca1e1..ad88e54950 100644 --- a/target/ppc/cpu_init.c +++ b/target/ppc/cpu_init.c @@ -6975,7 +6975,7 @@ static void register_power8_pmu_sup_sprs(CPUPPCState *env) static void register_power8_pmu_user_sprs(CPUPPCState *env) { spr_register(env, SPR_POWER_UMMCR2, "UMMCR2", - &spr_read_ureg, SPR_NOACCESS, + &spr_read_MMCR2_ureg, &spr_write_MMCR2_ureg, &spr_read_ureg, &spr_write_ureg, 0x00000000); spr_register(env, SPR_POWER_USIER, "USIER", diff --git a/target/ppc/power8-pmu-regs.c.inc b/target/ppc/power8-pmu-regs.c.inc index 37c812dd4d..fb95175183 100644 --- a/target/ppc/power8-pmu-regs.c.inc +++ b/target/ppc/power8-pmu-regs.c.inc @@ -55,6 +55,33 @@ static bool spr_groupA_write_allowed(DisasContext *ctx) return false; } +/* + * Helper function to avoid code repetition between MMCR0 and + * MMCR2 problem state write functions. + * + * 'ret' must be tcg_temp_freed() by the caller. + */ +static TCGv masked_gprn_for_spr_write(int gprn, int sprn, + uint64_t spr_mask) +{ + TCGv ret = tcg_temp_new(); + TCGv t0 = tcg_temp_new(); + + /* 'ret' starts with all mask bits cleared */ + gen_load_spr(ret, sprn); + tcg_gen_andi_tl(ret, ret, ~(spr_mask)); + + /* Apply the mask into 'gprn' in a temp var */ + tcg_gen_andi_tl(t0, cpu_gpr[gprn], spr_mask); + + /* Add the masked gprn bits into 'ret' */ + tcg_gen_or_tl(ret, ret, t0); + + tcg_temp_free(t0); + + return ret; +} + void spr_read_MMCR0_ureg(DisasContext *ctx, int gprn, int sprn) { TCGv t0; @@ -79,29 +106,68 @@ void spr_read_MMCR0_ureg(DisasContext *ctx, int gprn, int sprn) void spr_write_MMCR0_ureg(DisasContext *ctx, int sprn, int gprn) { - TCGv t0, t1; + TCGv masked_gprn; if (!spr_groupA_write_allowed(ctx)) { return; } - t0 = tcg_temp_new(); - t1 = tcg_temp_new(); - /* * Filter out all bits but FC, PMAO, and PMAE, according * to ISA v3.1, in 10.4.4 Monitor Mode Control Register 0, * fourth paragraph. */ - tcg_gen_andi_tl(t0, cpu_gpr[gprn], MMCR0_UREG_MASK); - gen_load_spr(t1, SPR_POWER_MMCR0); - tcg_gen_andi_tl(t1, t1, ~(MMCR0_UREG_MASK)); - /* Keep all other bits intact */ - tcg_gen_or_tl(t1, t1, t0); - gen_store_spr(SPR_POWER_MMCR0, t1); + masked_gprn = masked_gprn_for_spr_write(gprn, SPR_POWER_MMCR0, + MMCR0_UREG_MASK); + gen_store_spr(SPR_POWER_MMCR0, masked_gprn); + + tcg_temp_free(masked_gprn); +} + +void spr_read_MMCR2_ureg(DisasContext *ctx, int gprn, int sprn) +{ + TCGv t0; + + if (!spr_groupA_read_allowed(ctx)) { + return; + } + + t0 = tcg_temp_new(); + + /* + * On read, filter out all bits that are not FCnP0 bits. + * When MMCR0[PMCC] is set to 0b10 or 0b11, providing + * problem state programs read/write access to MMCR2, + * only the FCnP0 bits can be accessed. All other bits are + * not changed when mtspr is executed in problem state, and + * all other bits return 0s when mfspr is executed in problem + * state, according to ISA v3.1, section 10.4.6 Monitor Mode + * Control Register 2, p. 1316, third paragraph. + */ + gen_load_spr(t0, SPR_POWER_MMCR2); + tcg_gen_andi_tl(t0, t0, MMCR2_UREG_MASK); + tcg_gen_mov_tl(cpu_gpr[gprn], t0); tcg_temp_free(t0); - tcg_temp_free(t1); +} + +void spr_write_MMCR2_ureg(DisasContext *ctx, int sprn, int gprn) +{ + TCGv masked_gprn; + + if (!spr_groupA_write_allowed(ctx)) { + return; + } + + /* + * Filter the bits that can be written using MMCR2_UREG_MASK, + * similar to what is done in spr_write_MMCR0_ureg(). + */ + masked_gprn = masked_gprn_for_spr_write(gprn, SPR_POWER_MMCR2, + MMCR2_UREG_MASK); + gen_store_spr(SPR_POWER_MMCR2, masked_gprn); + + tcg_temp_free(masked_gprn); } #else void spr_read_MMCR0_ureg(DisasContext *ctx, int gprn, int sprn) @@ -113,4 +179,14 @@ void spr_write_MMCR0_ureg(DisasContext *ctx, int sprn, int gprn) { spr_noaccess(ctx, gprn, sprn); } + +void spr_read_MMCR2_ureg(DisasContext *ctx, int gprn, int sprn) +{ + spr_read_ureg(ctx, gprn, sprn); +} + +void spr_write_MMCR2_ureg(DisasContext *ctx, int sprn, int gprn) +{ + spr_noaccess(ctx, gprn, sprn); +} #endif /* defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY) */ diff --git a/target/ppc/spr_tcg.h b/target/ppc/spr_tcg.h index b28b095097..cb7f40eedf 100644 --- a/target/ppc/spr_tcg.h +++ b/target/ppc/spr_tcg.h @@ -33,6 +33,7 @@ void spr_read_ctr(DisasContext *ctx, int gprn, int sprn); void spr_write_ctr(DisasContext *ctx, int sprn, int gprn); void spr_read_ureg(DisasContext *ctx, int gprn, int sprn); void spr_read_MMCR0_ureg(DisasContext *ctx, int gprn, int sprn); +void spr_read_MMCR2_ureg(DisasContext *ctx, int gprn, int sprn); void spr_read_tbl(DisasContext *ctx, int gprn, int sprn); void spr_read_tbu(DisasContext *ctx, int gprn, int sprn); void spr_read_atbl(DisasContext *ctx, int gprn, int sprn); @@ -42,6 +43,7 @@ void spr_read_601_rtcu(DisasContext *ctx, int gprn, int sprn); void spr_read_spefscr(DisasContext *ctx, int gprn, int sprn); void spr_write_spefscr(DisasContext *ctx, int sprn, int gprn); void spr_write_MMCR0_ureg(DisasContext *ctx, int sprn, int gprn); +void spr_write_MMCR2_ureg(DisasContext *ctx, int sprn, int gprn); #ifndef CONFIG_USER_ONLY void spr_write_generic32(DisasContext *ctx, int sprn, int gprn);