From 5febf432df1cfa5b25d99b54c32103fafbdd0eb9 Mon Sep 17 00:00:00 2001 From: Miguel Ojeda Date: Sun, 16 Aug 2026 15:32:33 +0200 Subject: kbuild: rust: keep Rust objects out of Clang LTO with inline helpers Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit `objtool` errors such as: vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a: can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd The reason is that in such builds, the Clang invocation that compiles the combined Rust plus helpers bitcode emits LLVM bitcode (again) -- the final code generation happens in the linker's LTO step, which the `-mllvm` trap options passed to Clang do not reach. This, in turn, means that unreachable traps are missing, and the impossible paths do not merely fallthrough to the next symbol, but past the end of their own section, since LTO builds place each function in its own section. Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always emits machine code directly, with the traps in place. Assisted-by: LLM Cc: Gary Guo Cc: Boqun Feng Cc: Alice Ryhl Cc: Matthew Maurer Cc: Josh Poimboeuf Cc: Peter Zijlstra Cc: stable@vger.kernel.org Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust") Acked-by: Gary Guo Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org Signed-off-by: Miguel Ojeda --- drivers/accessibility/speakup/synth.c | 577 ++++++++++++++++++++++++++++++++++ 1 file changed, 577 insertions(+) create mode 100644 drivers/accessibility/speakup/synth.c (limited to 'drivers/accessibility/speakup/synth.c') diff --git a/drivers/accessibility/speakup/synth.c b/drivers/accessibility/speakup/synth.c new file mode 100644 index 000000000..d8addbf3a --- /dev/null +++ b/drivers/accessibility/speakup/synth.c @@ -0,0 +1,577 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include /* for isdigit() and friends */ +#include +#include /* for verify_area */ +#include /* for -EBUSY */ +#include /* for check_region, request_region */ +#include +#include /* for loops_per_sec */ +#include +#include +#include /* for copy_from_user */ +#include +#include +#include + +#include "spk_priv.h" +#include "speakup.h" +#include "serialio.h" + +static LIST_HEAD(synths); +struct spk_synth *synth; +char spk_pitch_buff[32] = ""; +static int module_status; +bool spk_quiet_boot; + +struct speakup_info_t speakup_info = { + /* + * This spinlock is used to protect the entire speakup machinery, and + * must be taken at each kernel->speakup transition and released at + * each corresponding speakup->kernel transition. + * + * The progression thread only interferes with the speakup machinery + * through the synth buffer, so only needs to take the lock + * while tinkering with the buffer. + * + * We use spin_lock/trylock_irqsave and spin_unlock_irqrestore with this + * spinlock because speakup needs to disable the keyboard IRQ. + */ + .spinlock = __SPIN_LOCK_UNLOCKED(speakup_info.spinlock), + .flushing = 0, +}; +EXPORT_SYMBOL_GPL(speakup_info); + +static int do_synth_init(struct spk_synth *in_synth); + +/* + * Main loop of the progression thread: keep eating from the buffer + * and push to the serial port, waiting as needed + * + * For devices that have a "full" notification mechanism, the driver can + * adapt the loop the way they prefer. + */ +static void _spk_do_catch_up(struct spk_synth *synth, int unicode) +{ + u16 ch; + unsigned long flags; + unsigned long jiff_max; + struct var_t *delay_time; + struct var_t *full_time; + struct var_t *jiffy_delta; + int jiffy_delta_val; + int delay_time_val; + int full_time_val; + int ret; + + jiffy_delta = spk_get_var(JIFFY); + full_time = spk_get_var(FULL); + delay_time = spk_get_var(DELAY); + + spin_lock_irqsave(&speakup_info.spinlock, flags); + jiffy_delta_val = jiffy_delta->u.n.value; + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + + jiff_max = jiffies + jiffy_delta_val; + while (!kthread_should_stop()) { + spin_lock_irqsave(&speakup_info.spinlock, flags); + if (speakup_info.flushing) { + speakup_info.flushing = 0; + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + synth->flush(synth); + continue; + } + if (!unicode) + synth_buffer_skip_nonlatin1(); + if (synth_buffer_empty()) { + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + break; + } + ch = synth_buffer_peek(); + set_current_state(TASK_INTERRUPTIBLE); + full_time_val = full_time->u.n.value; + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + if (ch == '\n') + ch = synth->procspeech; + if (unicode) + ret = synth->io_ops->synth_out_unicode(synth, ch); + else + ret = synth->io_ops->synth_out(synth, ch); + if (!ret) { + schedule_timeout(msecs_to_jiffies(full_time_val)); + continue; + } + if (time_after_eq(jiffies, jiff_max) && (ch == SPACE)) { + spin_lock_irqsave(&speakup_info.spinlock, flags); + jiffy_delta_val = jiffy_delta->u.n.value; + delay_time_val = delay_time->u.n.value; + full_time_val = full_time->u.n.value; + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + if (synth->io_ops->synth_out(synth, synth->procspeech)) + schedule_timeout( + msecs_to_jiffies(delay_time_val)); + else + schedule_timeout( + msecs_to_jiffies(full_time_val)); + jiff_max = jiffies + jiffy_delta_val; + } + set_current_state(TASK_RUNNING); + spin_lock_irqsave(&speakup_info.spinlock, flags); + synth_buffer_getc(); + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + } + synth->io_ops->synth_out(synth, synth->procspeech); +} + +void spk_do_catch_up(struct spk_synth *synth) +{ + _spk_do_catch_up(synth, 0); +} +EXPORT_SYMBOL_GPL(spk_do_catch_up); + +void spk_do_catch_up_unicode(struct spk_synth *synth) +{ + _spk_do_catch_up(synth, 1); +} +EXPORT_SYMBOL_GPL(spk_do_catch_up_unicode); + +void spk_synth_flush(struct spk_synth *synth) +{ + synth->io_ops->flush_buffer(synth); + synth->io_ops->synth_out(synth, synth->clear); +} +EXPORT_SYMBOL_GPL(spk_synth_flush); + +unsigned char spk_synth_get_index(struct spk_synth *synth) +{ + return synth->io_ops->synth_in_nowait(synth); +} +EXPORT_SYMBOL_GPL(spk_synth_get_index); + +int spk_synth_is_alive_nop(struct spk_synth *synth) +{ + synth->alive = 1; + return 1; +} +EXPORT_SYMBOL_GPL(spk_synth_is_alive_nop); + +int spk_synth_is_alive_restart(struct spk_synth *synth) +{ + if (synth->alive) + return 1; + if (synth->io_ops->wait_for_xmitr(synth) > 0) { + /* restart */ + synth->alive = 1; + synth_printf("%s", synth->init); + return 2; /* reenabled */ + } + pr_warn("%s: can't restart synth\n", synth->long_name); + return 0; +} +EXPORT_SYMBOL_GPL(spk_synth_is_alive_restart); + +static void thread_wake_up(struct timer_list *unused) +{ + wake_up_interruptible_all(&speakup_event); +} + +static DEFINE_TIMER(thread_timer, thread_wake_up); + +void synth_start(void) +{ + struct var_t *trigger_time; + + if (!synth->alive) { + synth_buffer_clear(); + return; + } + trigger_time = spk_get_var(TRIGGER); + if (!timer_pending(&thread_timer)) + mod_timer(&thread_timer, jiffies + + msecs_to_jiffies(trigger_time->u.n.value)); +} + +void spk_do_flush(void) +{ + if (!synth) + return; + + speakup_info.flushing = 1; + synth_buffer_clear(); + if (synth->alive) { + if (spk_pitch_shift) { + synth_printf("%s", spk_pitch_buff); + spk_pitch_shift = 0; + } + } + wake_up_interruptible_all(&speakup_event); + wake_up_process(speakup_task); +} + +void synth_write(const char *_buf, size_t count) +{ + const unsigned char *buf = (const unsigned char *) _buf; + + while (count--) + synth_buffer_add(*buf++); + synth_start(); +} + +/* Consume one utf-8 character from buf (that contains up to count bytes), + * returns the unicode codepoint if valid, -1 otherwise. + * In all cases, returns the number of consumed bytes in *consumed, + * and the minimum number of bytes that would be needed for the next character + * in *want. + */ +s32 synth_utf8_get(const char *buf, size_t count, size_t *consumed, size_t *want) +{ + unsigned char c = buf[0]; + int nbytes = 8 - fls(c ^ 0xff); + u32 value; + size_t i; + + switch (nbytes) { + case 8: /* 0xff */ + case 7: /* 0xfe */ + case 1: /* 0x80 */ + /* Invalid, drop */ + *consumed = 1; + *want = 1; + return -1; + + case 0: + /* ASCII, take as such */ + *consumed = 1; + *want = 1; + return c; + + default: + /* 2..6-byte UTF-8 */ + + if (count < nbytes) { + /* We don't have it all */ + *consumed = 0; + *want = nbytes; + return -1; + } + + /* First byte */ + value = c & ((1u << (7 - nbytes)) - 1); + + /* Other bytes */ + for (i = 1; i < nbytes; i++) { + c = buf[i]; + if ((c & 0xc0) != 0x80) { + /* Invalid, drop the head */ + *consumed = i; + *want = 1; + return -1; + } + value = (value << 6) | (c & 0x3f); + } + + *consumed = nbytes; + *want = 1; + return value; + } +} + +void synth_writeu(const char *buf, size_t count) +{ + size_t i, consumed, want; + + /* Convert to u16 */ + for (i = 0; i < count; i++) { + s32 value; + + value = synth_utf8_get(buf + i, count - i, &consumed, &want); + if (value == -1) { + /* Invalid or incomplete */ + + if (want > count - i) + /* We don't have it all, stop */ + count = i; + + continue; + } + + if (value < 0x10000) + synth_buffer_add(value); + } + + synth_start(); +} + +void synth_printf(const char *fmt, ...) +{ + va_list args; + unsigned char buf[160]; + int r; + + va_start(args, fmt); + r = vsnprintf(buf, sizeof(buf), fmt, args); + va_end(args); + if (r > sizeof(buf) - 1) + r = sizeof(buf) - 1; + + synth_writeu(buf, r); +} +EXPORT_SYMBOL_GPL(synth_printf); + +void synth_putwc(u16 wc) +{ + synth_buffer_add(wc); +} +EXPORT_SYMBOL_GPL(synth_putwc); + +void synth_putwc_s(u16 wc) +{ + synth_buffer_add(wc); + synth_start(); +} +EXPORT_SYMBOL_GPL(synth_putwc_s); + +void synth_putws(const u16 *buf) +{ + const u16 *p; + + for (p = buf; *p; p++) + synth_buffer_add(*p); +} +EXPORT_SYMBOL_GPL(synth_putws); + +void synth_putws_s(const u16 *buf) +{ + synth_putws(buf); + synth_start(); +} +EXPORT_SYMBOL_GPL(synth_putws_s); + +static int index_count; +static int sentence_count; + +void spk_reset_index_count(int sc) +{ + static int first = 1; + + if (first) + first = 0; + else + synth->get_index(synth); + index_count = 0; + sentence_count = sc; +} + +int synth_supports_indexing(void) +{ + if (synth->get_index) + return 1; + return 0; +} + +void synth_insert_next_index(int sent_num) +{ + int out; + + if (synth->alive) { + if (sent_num == 0) { + synth->indexing.currindex++; + index_count++; + if (synth->indexing.currindex > + synth->indexing.highindex) + synth->indexing.currindex = + synth->indexing.lowindex; + } + + out = synth->indexing.currindex * 10 + sent_num; + synth_printf(synth->indexing.command, out, out); + } +} + +void spk_get_index_count(int *linecount, int *sentcount) +{ + int ind = synth->get_index(synth); + + if (ind) { + sentence_count = ind % 10; + + if ((ind / 10) <= synth->indexing.currindex) + index_count = synth->indexing.currindex - (ind / 10); + else + index_count = synth->indexing.currindex + - synth->indexing.lowindex + + synth->indexing.highindex - (ind / 10) + 1; + } + *sentcount = sentence_count; + *linecount = index_count; +} + +static struct resource synth_res; + +int synth_request_region(unsigned long start, unsigned long n) +{ + struct resource *parent = &ioport_resource; + + memset(&synth_res, 0, sizeof(synth_res)); + synth_res.name = synth->name; + synth_res.start = start; + synth_res.end = start + n - 1; + synth_res.flags = IORESOURCE_BUSY; + return request_resource(parent, &synth_res); +} +EXPORT_SYMBOL_GPL(synth_request_region); + +int synth_release_region(unsigned long start, unsigned long n) +{ + return release_resource(&synth_res); +} +EXPORT_SYMBOL_GPL(synth_release_region); + +struct var_t synth_time_vars[] = { + { DELAY, .u.n = {NULL, 100, 100, 2000, 0, 0, NULL } }, + { TRIGGER, .u.n = {NULL, 20, 10, 2000, 0, 0, NULL } }, + { JIFFY, .u.n = {NULL, 50, 20, 200, 0, 0, NULL } }, + { FULL, .u.n = {NULL, 400, 200, 60000, 0, 0, NULL } }, + { FLUSH, .u.n = {NULL, 4000, 10, 4000, 0, 0, NULL } }, + V_LAST_VAR +}; + +/* called by: speakup_init() */ +int synth_init(char *synth_name) +{ + int ret = 0; + struct spk_synth *tmp, *synth = NULL; + + if (!synth_name) + return 0; + + if (strcmp(synth_name, "none") == 0) { + mutex_lock(&spk_mutex); + synth_release(); + mutex_unlock(&spk_mutex); + return 0; + } + + mutex_lock(&spk_mutex); + /* First, check if we already have it loaded. */ + list_for_each_entry(tmp, &synths, node) { + if (strcmp(tmp->name, synth_name) == 0) + synth = tmp; + } + + /* If we got one, initialize it now. */ + if (synth) + ret = do_synth_init(synth); + else + ret = -ENODEV; + mutex_unlock(&spk_mutex); + + return ret; +} + +/* called by: synth_add() */ +static int do_synth_init(struct spk_synth *in_synth) +{ + struct var_t *var; + + synth_release(); + if (in_synth->checkval != SYNTH_CHECK) + return -EINVAL; + synth = in_synth; + synth->alive = 0; + pr_warn("synth probe\n"); + if (synth->probe(synth) < 0) { + pr_warn("%s: device probe failed\n", in_synth->name); + synth = NULL; + return -ENODEV; + } + synth_time_vars[0].u.n.value = + synth_time_vars[0].u.n.default_val = synth->delay; + synth_time_vars[1].u.n.value = + synth_time_vars[1].u.n.default_val = synth->trigger; + synth_time_vars[2].u.n.value = + synth_time_vars[2].u.n.default_val = synth->jiffies; + synth_time_vars[3].u.n.value = + synth_time_vars[3].u.n.default_val = synth->full; + synth_time_vars[4].u.n.value = + synth_time_vars[4].u.n.default_val = synth->flush_time; + synth_printf("%s", synth->init); + for (var = synth->vars; + (var->var_id >= 0) && (var->var_id < MAXVARS); var++) + speakup_register_var(var); + if (!spk_quiet_boot) + synth_printf("%s found\n", synth->long_name); + if (synth->attributes.name && + sysfs_create_group(speakup_kobj, &synth->attributes) < 0) + return -ENOMEM; + synth_flags = synth->flags; + wake_up_interruptible_all(&speakup_event); + if (speakup_task) + wake_up_process(speakup_task); + return 0; +} + +void synth_release(void) +{ + struct var_t *var; + unsigned long flags; + + if (!synth) + return; + spin_lock_irqsave(&speakup_info.spinlock, flags); + pr_info("releasing synth %s\n", synth->name); + synth->alive = 0; + timer_delete(&thread_timer); + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + if (synth->attributes.name) + sysfs_remove_group(speakup_kobj, &synth->attributes); + for (var = synth->vars; var->var_id != MAXVARS; var++) + speakup_unregister_var(var->var_id); + synth->release(synth); + synth = NULL; +} + +/* called by: all_driver_init() */ +int synth_add(struct spk_synth *in_synth) +{ + int status = 0; + struct spk_synth *tmp; + + mutex_lock(&spk_mutex); + + list_for_each_entry(tmp, &synths, node) { + if (tmp == in_synth) { + mutex_unlock(&spk_mutex); + return 0; + } + } + + if (in_synth->startup) + status = do_synth_init(in_synth); + + if (!status) + list_add_tail(&in_synth->node, &synths); + + mutex_unlock(&spk_mutex); + return status; +} +EXPORT_SYMBOL_GPL(synth_add); + +void synth_remove(struct spk_synth *in_synth) +{ + mutex_lock(&spk_mutex); + if (synth == in_synth) + synth_release(); + list_del(&in_synth->node); + module_status = 0; + mutex_unlock(&spk_mutex); +} +EXPORT_SYMBOL_GPL(synth_remove); + +struct spk_synth *synth_current(void) +{ + return synth; +} +EXPORT_SYMBOL_GPL(synth_current); + +short spk_punc_masks[] = { 0, SOME, MOST, PUNC, PUNC | B_SYM }; -- cgit v1.3.1